Free · Private · Runs in your browser
Handy web tools, minus the hassle.
Free online tools that run 100% in your browser. Your files never leave your device — no uploads, no sign-up, no limits.
Every tool here runs inside this tab. Nothing you open is uploaded — the file is read by JavaScript on your own machine, the work happens there, and the result comes straight back. No account, no queue, no server holding a copy. That is also why it is quick: a large PDF does not travel anywhere before it can be worked on.
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PDF Editor — Fix Text, Merge, Reorder, Rotate, Watermark & Split
Edit a PDF in your browser: fix the text already on the page, merge, reorder, rotate or delete pages, add a watermark or page numbers, split. Free, no upload.
DeveloperJSON Formatter & Validator
Beautify, minify and validate JSON — a collapsible tree view, syntax errors by line and column, any indent width or tabs, sort keys, and download.
DeveloperQR Code Generator
Create a QR code for a URL, Wi-Fi, contact, email, SMS, phone, location, PayPal or SEPA transfer — dot and corner shapes, a center logo, PNG or SVG. Free.
ImageBulk Image Converter — Resize, Compress & Convert
Batch resize, compress and convert images — PNG, JPG, WebP, AVIF and animated GIF, MozJPEG, palette PNG, target KB, zip download. Free, in-browser, no upload.
TextWord & Character Counter
Count words, characters, sentences, lines and paragraphs live as you type — free and 100% in your browser.
ColorColor Converter (HEX, RGB, HSL)
One color in 13 formats — HEX, RGB, HSL, HWB, OKLCH, LAB, LCH, XYZ, LUV, CMYK — with harmonies, tints and shades and WCAG contrast. Free, in your browser.
DeveloperPassword Generator
Generate strong random passwords or memorable word passphrases in your browser. Free, nothing sent anywhere.
TextText Case Converter
Fourteen case styles at once — UPPERCASE, Title, camelCase, snake_case and more, with AP/APA/Chicago/MLA headlines and a name dictionary. No upload.
PDF Editor — Fix Text, Merge, Reorder, Rotate, Watermark & Split
Edit a PDF in your browser: fix the text already on the page, merge, reorder, rotate or delete pages, add a watermark or page numbers, split. Free, no upload.
PDFImages to PDF
Combine JPG and PNG images into one PDF — drag to reorder, pick A4/Letter or fit-to-image, and set a margin. Free, no upload, in your browser.
PDFPDF to Images
Convert PDF pages to PNG, JPG or TIFF — any page range, several PDFs at once, in colour or grayscale, or pull out the pictures stored inside. Free, no upload.
PDFExtract Text from PDF
Pull the text out of a PDF with its line breaks and paragraphs intact, and read scanned pages in Korean or English with built-in OCR. Free, no upload.
PDFCompress PDF
Make a PDF smaller three ways — repack it, shrink only the pictures and keep the text, or squeeze scans as JPEGs. Several files at once. Free, no upload.
PDFMake PDF Look Scanned
Make a PDF or a photo look scanned: grayscale, grain, softness, skew, yellowed paper and the edge shadow. Save as PDF or PNG. In your browser, no upload.
PDFPDF to EPUB
Convert a PDF into a reflowable EPUB ebook for any e-reader — 100% in your browser, no upload
PDFPDF Signature Checker
Inspect a PDF for digital signatures: signer, issuer, the whole certificate chain, and whether they cover the entire file. 100% in your browser, no upload.
PDFReverse PDF Pages
Reverse the page order of a PDF in one click to fix a back-to-front duplex scan — 100% in your browser, no upload
PDFAdd Blank Pages to PDF
Insert a blank page into a PDF and drag it exactly where it belongs in the page list, sized to match the document — 100% in your browser, no upload
PDFInterleave PDF Pages
Interleave two or more PDFs into one — put separate odd-page and even-page scans back in the right order (A1, B1, A2, B2…), or re-order one two-sided scan.
PDFPDF Metadata Editor
View and edit the Title, Author, Subject, Keywords, Creator, Producer, dates, Trapped and custom fields in one PDF or a whole batch. Free, no upload.
PDFRemove PDF Annotations
Strip comments, highlights, sticky notes, links or form fields from a PDF — see everything it found and preview the result before you commit. No upload.
PDFPDF N-up (Pages Per Sheet)
Place 2, 4, 6, 8, 9 or 16 PDF pages on each sheet for handouts, thumbnails and saving paper, with a live preview of the finished sheet. Free, no upload.
PDFRemove PDF Metadata
Strip hidden metadata from a PDF — title, author, keywords, dates, the XMP stream, auto-run scripts and embedded files. 100% in your browser, no upload
PDFExtract PDF Attachments
List and download the files embedded inside a PDF — attachments and portfolio items — 100% in your browser, no upload
PDFAdd Attachments to PDF
Embed any files — CSV, images, text, even another PDF — inside a PDF as attachments that open from the Attachments panel of a desktop reader. No upload.
PDFLock a PDF Form So the Answers Cannot Be Changed (Flatten)
Flatten the interactive form fields in a PDF into static page content so the values cannot be edited, cleared, or reverted — 100% in your browser, no upload
PDFPDF Form Filler
Fill in a PDF form — text fields, checkboxes, radio buttons and dropdowns — right in your browser, and flatten the answers in afterwards. Free, no upload.
PDFResize PDF Pages (A4, Letter, A3 or Any Size)
Make every page of a PDF one size — A0 to A6, B5, Letter, Legal, or a size you type in mm, cm or inches — and add blank margins on any edge. Free, no upload.
PDFDivide PDF Pages (Split Into Halves or Quarters)
Cut each PDF page into halves or quarters and drag the cut line onto the fold — turn off-centre book-spread scans back into single pages. Free, no upload.
PDFPDF Overlay (Stamp PDF on PDF)
Stamp a letterhead, watermark, seal or signature PDF onto another PDF — drag it into place, size it, turn it, fade it, and pick the pages. Free, no upload.
PDFMerge PDF
Join several PDFs into one and put the pages in the order you want — drag to reorder, rotate or drop any page before saving. 100% in your browser, no upload
PDFSplit PDF
Cut a PDF where you point: scissors between pages, ranges like "1-3, 5, 8", odd and even apart, every N pages, or at its own bookmarks. Free, no upload.
PDFWatermark PDF
Put a watermark on every page and then move it, size it, angle it and recolour it by hand — not from a list of three positions. 100% in your browser, no upload
PDFAdd Page Numbers to PDF
Number every page automatically, then drag the number where you want it and style it however you like. 100% in your browser, no upload
PDFRotate PDF
Turn one page or the whole document, see every page while you do it, and save the rotation permanently. 100% in your browser, no upload
PDFCrop PDF Margins
Drag on the page to trim scan borders and whitespace off a PDF, with the page in front of you — 100% in your browser, no upload
PDFPDF Bookmark Editor
Add or edit the bookmarks in a PDF — the clickable outline a reader shows in its sidebar — as a nested, editable list, then save the file. Free, no upload.
PDFMarkdown to PDF
Render Markdown — headings, lists, tables, images, links, code — into a paginated PDF with page numbers, heading bookmarks and colours you pick. No upload.
PDFExcel to PDF
Convert an Excel or CSV spreadsheet into a clean, printable PDF table — 100% in your browser, no upload
PDFPDF to Markdown
Convert a PDF into clean Markdown — headings, lists, tables, links and pictures rebuilt from the text layout — 100% in your browser, no upload
PDFPDF to Grayscale
Turn a colour PDF grey, or pure black-and-white, without touching the text — it stays selectable, searchable and sharp — 100% in your browser, no upload
PDFInvert PDF Colours
Flip a PDF to its colour negative for dark-mode and e-ink reading — white pages turn black and the text stays selectable — 100% in your browser, no upload
PDFRasterize PDF (Flatten to Images)
Flatten a PDF to images and rebuild it — selectable text, fonts, vectors, form fields and annotations all go, leaving an uneditable copy. Free, no upload.
PDFPDF to SVG
Convert each PDF page into real vector SVG — lines, shapes and letters as editable objects that stay sharp at any size, zipped per page. Free, no upload.
PDFRemove Blank Pages from PDF
Find the blank pages a duplex scanner leaves behind, see every one as a thumbnail, keep any the tool got wrong, then delete the rest. Free, no upload.
PDFExtract Images from PDF
Pull the original embedded images out of a PDF as separate files, not page screenshots — one at a time or all as a zip. Free, no upload, in your browser.
PDFSVG to PDF
Convert one SVG or many into true vector PDFs that stay sharp at any print size — one PDF a page per drawing, or a .zip of one each. Free, no upload.
PDFRemove PDF Restrictions
Remove print, copy and edit restrictions from a PDF, and its open password when you know it — decrypted, not redrawn, so the text stays selectable.
PDFCompare PDFs (Visual & Text Diff)
Compare two PDF versions side by side — a visual pixel diff of what changed on each page, a line-by-line text diff, and which pages differ. Free, no upload.
PDFSign PDF
Add your signature to a PDF — draw, type, photograph or reuse a saved one, place it anywhere, then download the signed file — 100% in your browser, no upload
PDFRedact PDF
Find a word in a PDF and black out every occurrence — the words are deleted from the file itself and the page keeps its other text and links. Free, no upload.
PDFTIFF to PDF
Convert a single- or multi-page TIFF scan into a PDF — pages keep their exact pixel size by default, or fit to A4, Letter and more. In your browser, no upload
PDFPSD to PDF
Convert Photoshop PSD files to PDF — the flattened composite at full resolution, one file or a pile combined into one PDF — 100% in your browser, no upload
PDFMake a PDF Booklet
Reorder and 2-up a PDF for saddle-stitch booklet printing, with a preview of the first sheet and the page order of every sheet before you print. No upload.
PDFPDF Poster (Tile a Page Across Multiple Sheets)
Blow one PDF page up into a printable poster tiled across a grid of sheets you tape together — pick your paper and drag the cut lines off a headline. No upload.
PDFPDF to Excel
Detect the tables in one PDF or several, check and correct the grid on screen, then export the pages you keep as .xlsx or CSV — 100% in your browser, no upload
PDFDeskew Scanned PDF
Straighten a tilted scan: every page measured on its own, adjustable by hand, and pages that are already straight are left alone. Free, no upload.
PDFPDF to Word (DOCX)
Convert a PDF to an editable Word .docx — headings, bold, italic and lists worked out from the type, with anything left behind listed. Free, no upload.
PDFWord to PDF
Convert a Word .docx into a clean, paginated PDF — headings, paragraphs, lists, tables, pictures and bold or italic laid out. Free, no upload, in your browser.
PDFEPUB to PDF
Convert an EPUB ebook into a printable PDF — cover and pictures carried over, chapters in reading order, its contents as clickable bookmarks. No upload.
PDFPDF to PowerPoint (PPTX)
Turn each PDF page into a slide whose words you can actually retype — several PDFs into one deck, a real .pptx, 100% in your browser, no upload
PDFPDF Password Protect & Remove
Encrypt a PDF with AES-128 or AES-256, or remove a password you know — several files at once, real PDF encryption, 100% in your browser, no upload
PDFHEIC to PDF
Convert iPhone HEIC/HEIF photos to PDF — decoded with libheif right in your browser, no upload
Image
32Bulk Image Converter — Resize, Compress & Convert
Batch resize, compress and convert images — PNG, JPG, WebP, AVIF and animated GIF, MozJPEG, palette PNG, target KB, zip download. Free, in-browser, no upload.
ImageImage Editor — Crop, Rotate, Filters & Effects
Crop an image with drag handles, ratio presets and exact pixel sizes, then rotate, flip, resize, adjust, filter, add a border or watermark. No upload.
ImageFavicon Generator
Make a favicon from a picture or from letters: favicon.ico, an SVG, PNG fallbacks, a Windows tile, a manifest and the tags — free, no upload, in your browser.
ImageImage to Base64
Convert an image to a Base64 Data URI with ready-to-paste HTML, CSS and Markdown — no upload, 100% in your browser.
ImageImage Color Picker
Pick colors from an image — click any pixel for its exact hex, with a magnifier to aim — then export the palette as CSS, Tailwind, SVG or ASE. No upload.
ImageBase64 to Image Converter
Paste a Base64 or data URI string, preview the decoded image instantly, and download it — runs 100% in your browser with nothing uploaded.
ImageAverage Color of an Image
Find the average color of any image as a hex and RGB swatch, plus a palette of the main colors in the picture — runs 100% in your browser, no upload required.
ImagePlaceholder Image Generator
Generate a solid-color placeholder image with its size as centered text, and download it as a PNG or SVG or copy the SVG markup or data URI. No upload.
ImageEXIF Remover — Strip Photo Metadata & GPS
Strip EXIF, GPS and other hidden metadata from a photo before you share it — a lossless JPEG strip, or a universal re-encode. Free, no upload, in your browser.
ImageCode to Image
Turn a code snippet into a beautiful, shareable PNG — syntax highlighting, themes and an optional macOS window frame. Free, 100% in your browser.
ImageImage to ASCII Art Converter
Turn a photo or logo into ASCII art: choose the characters or type your own, keep the picture's colours, and save as text, PNG or SVG. Free, no upload.
ImageSVG to PNG Converter
Convert SVG markup or files to a crisp PNG — set an exact pixel size or a 1×–3× scale, and a transparent or solid background. Free, no upload, in your browser.
ImageImage Color Counter
Count the number of unique colors in any image and list the most common ones — runs 100% in your browser, no upload.
ImageEXIF Viewer & Metadata Remover
See the metadata hiding in a JPEG, PNG, WebP, HEIC or TIFF — camera, date, GPS on a map — and download a clean copy with it removed. In your browser.
ImageYouTube Thumbnail Downloader
Grab the thumbnail image from any YouTube video in every resolution (HD, SD, HQ). Paste a URL or the video ID — free, no sign-up.
ImageQR Code Reader
Scan and decode a QR code from an image — 100% in your browser, no upload
ImageImage Censor — Blur, Pixelate & Black-Box
Hide faces, license plates and secrets before you share — draw a box over any region and blur, pixelate or black it out, then save the PNG. Free, no upload.
ImageImage Watermark — Add a Text Watermark to Photos
Watermark one photo or a whole batch with text or your own logo — drag it anywhere, or tile it across the picture so a crop cannot remove it. Free, no upload.
ImageImage Color Swap — Replace or Key Out a Colour
Replace one colour in an image with another, or key it out to transparency, with click-to-pick and a tolerance slider — 100% in your browser, no upload
ImageWebcam Recorder
Take a photo or record video and audio from your webcam, then download it — 100% in your browser, no upload
ImageSVG Stroke to Fill
Convert stroked SVG paths and shapes into filled outline paths, so lines, circles and icons keep their look with no stroke — 100% in your browser, no upload
ImageGIF Maker
Combine images into an animated GIF — reorder or sort them, set a delay per frame, crossfade, pick the play count and width (up to 1920px). Free, no upload.
ImageText to Handwriting
Turn typed text into a handwritten page on ruled, grid, dotted, legal-pad, blank or your own paper, then save a PNG or PDF — 100% in your browser, no upload
ImageImage to Text (OCR)
Extract text from an image — Korean or English screenshots, scans and photos — with OCR that runs entirely in your browser, no upload.
ImageImage Steganography — Hide Text in a Picture
Hide a secret text message inside the pixels of an image with LSB steganography and extract it back later, as a lossless PNG. Free, no upload, in your browser.
ImageHEIC to JPG, PNG, WebP & AVIF Converter
Convert iPhone HEIC/HEIF photos to JPG, PNG, WebP or AVIF, resized if you want — 100% in your browser, no upload.
ImageCombine Images (Collage Maker)
Merge multiple images into one — side by side, stacked, or in a grid. 100% in your browser.
ImageImage Splitter (Grid Slicer)
Slice an image into a grid — drag the cut lines to make the pieces uneven, then download them all as a ZIP. 100% in your browser.
ImageImage to SVG Vectorizer
Trace a PNG or JPG into scalable SVG vector paths — 100% in your browser, no upload.
ImageTIFF to JPG / PNG Converter
Convert TIFF scans and faxes to JPG or PNG — every page of a multi-page TIFF is shown so you can pick the ones you want. 100% in your browser, no upload.
ImageColor Blindness Simulator
Preview how an image looks with protanopia, deuteranopia, tritanopia or achromatopsia — 100% in your browser.
ImageBackground Remover
Cut out a subject and remove the background — AI in your browser. Batch, erase/restore brush, colour or photo behind, drop shadow, full-size PNG or JPG.
Text
37Word & Character Counter
Count words, characters, sentences, lines and paragraphs live as you type — free and 100% in your browser.
TextText Case Converter
Fourteen case styles at once — UPPERCASE, Title, camelCase, snake_case and more, with AP/APA/Chicago/MLA headlines and a name dictionary. No upload.
TextSlug Generator
Turn titles into clean URL slugs — choose hyphen or underscore, lowercase or original case, max length, stop-word stripping, and batch mode. Free, in-browser.
TextLorem Ipsum Generator
Placeholder text by words, sentences, paragraphs, characters or bytes — Latin, Cicero, Kafka, Korean, Japanese or Cyrillic — as plain text, HTML or Markdown.
TextFind & Replace Text
Find and replace text in bulk, with optional regex and case-insensitive matching. Free, private, in your browser.
TextText Diff Checker
Compare two texts line by line, side by side or unified — word and character diff, merge arrows, ignore rules, syntax highlighting. Free, in your browser.
TextList Randomizer
Shuffle a list into random order or draw as many random items as you want — one per line, or comma, semicolon or space separated. All in your browser.
TextRandom Number Generator
Generate random integers between any min and max, with optional unique values — free and 100% in your browser, nothing uploaded.
TextRemove Line Breaks
Remove or replace line breaks in your text and join lines into one — runs 100% in your browser with no upload.
TextReverse Text
Reverse any text by characters, words, or lines instantly — runs 100% in your browser with no upload.
TextText Repeater
Repeat any text as many times as you want with a chosen separator — runs 100% in your browser, nothing is uploaded.
TextWord Frequency Counter
Count how often each word appears in your text and see a sorted frequency table — runs 100% in your browser with no upload.
TextText Sorter
Sort lines of text by natural sort (file2 before file10), alphabetically, numerically, by length, or randomly — 100% in your browser, no upload.
TextWhitespace Cleaner
Clean up messy whitespace — trim lines, collapse spaces, drop blank lines, convert tabs, or strip all spaces — running 100% in your browser with no upload.
TextDice Roller
Roll dice from standard notation like 2d6+3 and see every die and the total — free and 100% in your browser, nothing uploaded.
TextWord Wrap
Wrap text to a fixed line width, optionally hard-breaking overlong words, running 100% in your browser with no upload.
TextRemove Accents & Diacritics from Text
Strip accents and diacritics from any text (café → cafe, naïve → naive) — running 100% in your browser with no upload.
TextPalindrome Checker
Check whether a word, phrase, or sentence is a palindrome, with options to ignore case and punctuation — runs 100% in your browser with no upload.
TextString Similarity
Compare two strings to get their Levenshtein edit distance and a similarity percentage instantly — runs 100% in your browser with no upload.
TextKeyword Density Checker
Analyze your text to see the most frequent words with their count and density percentage — runs 100% in your browser with no upload.
TextReadability Score Checker
Check the Flesch Reading Ease and Flesch-Kincaid Grade Level of any English text, with live word, sentence and syllable counts. Free, in your browser.
TextRemove Emoji from Text
Strip every emoji and pictographic symbol out of any text (hi 😀 there 🎉 → hi there) — running 100% in your browser with no upload.
TextText to Speech
Turn text into spoken audio with the voices installed on your device — pick a voice, speed and pitch, and press play. The text stays on your device.
TextWord Cloud Generator
Turn text into a word cloud — the most frequent words appear largest. Download as PNG. 100% in your browser, no upload.
TextRemove Duplicate Lines
Remove duplicate lines, or count how many times each line repeats — case-insensitive, trim and blank-line options. Free, in your browser.
TextOnline Notepad
A distraction-free notepad that autosaves to your browser as you type — 100% in your browser, no upload, no sign-in.
TextList Compare
Compare two lists and get their intersection, differences, union, and symmetric difference — 100% in your browser, no upload.
TextUnicode Normalizer
Convert text between the Unicode normalization forms NFC, NFD, NFKC and NFKD — compose or decompose accents, fold look-alikes. Free, in your browser.
TextANSI Escape Code Remover
Remove ANSI escape codes — colors, cursor moves and OSC sequences — from terminal and CI log output to get clean, greppable plain text. Free, no upload.
TextString Masker
Mask the middle of API keys, tokens, card numbers and other PII — keep the first and last few characters, redact the rest, a whole list at once. No upload.
TextInvisible Character Detector
Find and remove invisible Unicode characters — zero-width spaces, bidi overrides, soft hyphens and BOMs hiding in your text — 100% in your browser, no upload
TextBionic Reading Converter
Bold the first few letters of every word to skim faster — paste text or open a PDF or EPUB, and save it back as a PDF or image. 100% in your browser.
TextNumeronym Generator
Turn words like internationalization into i18n and accessibility into a11y — 100% in your browser, no upload
TextText Censor
Mask or replace a custom list of words in any text — length-preserving mask, whole-word and ignore-case options — 100% in your browser, no upload
TextList Chunker
Split a list into fixed-size chunks — batch IDs or rows for APIs, one item per line — 100% in your browser, no upload
TextWrap Lines (Add Prefix & Suffix)
Add a prefix and suffix to every line — turn a plain list into a quoted array, a SQL IN() list or HTML list items in one click. Free, no upload.
TextBraille Translator
Convert text to and from Unicode Braille patterns — Grade 1 letters, digits, space and punctuation, 100% in your browser with no upload.
Developer
119JSON Formatter & Validator
Beautify, minify and validate JSON — a collapsible tree view, syntax errors by line and column, any indent width or tabs, sort keys, and download.
DeveloperBase Encoder — Base64, Base32, Base58, Ascii85 & Z85
Encode and decode text or any file with Base64, Base32, Base58, Base64URL, Ascii85 or Z85 — five character sets, 76-char MIME lines, per-line mode.
DeveloperURL Encoder & Decoder
Percent-encode text for safe use in URLs, or decode an encoded URL back to readable text. Free, in your browser.
DeveloperHash Generator (MD5 & SHA)
Hash text or a file as you type — 14 digests including MD5, SHA-256, SHA-3 and BLAKE3, plus HMAC, 7 input encodings and checksum verify. In your browser.
DeveloperID Generator — UUID, NanoID, ULID, ObjectID & MAC
Ten ID types — UUID v1/v3/v4/v5/v7, nil, NanoID, ULID, ObjectID, MAC — up to 1,000 at a time, with GUID styling and a UUID validator. Free, in your browser.
DeveloperJSON to CSV Converter
Convert a JSON array of objects to CSV, or CSV back to JSON — quoting handled correctly. Free, in your browser.
DeveloperPassword Generator
Generate strong random passwords or memorable word passphrases in your browser. Free, nothing sent anywhere.
DeveloperJWT Decoder
Decode a JWT and verify its HMAC or RSA/ECDSA signature with your secret or public key, plus a live expiry countdown. Token and keys never leave your device.
DeveloperUnix Timestamp Converter
Convert Unix (s/ms/µs/ns), Windows FILETIME, Mongo ObjectID and Excel serials to dates in any time zone, and back. Live epoch clock. Free, in-browser.
DeveloperQR Code Generator
Create a QR code for a URL, Wi-Fi, contact, email, SMS, phone, location, PayPal or SEPA transfer — dot and corner shapes, a center logo, PNG or SVG. Free.
DeveloperRegex Tester
Test a regex live — 7 flags, group offsets, a plain-English explanation, test cases, a share link and code for 8 languages. Free, in your browser.
DeveloperMarkdown to HTML
Convert Markdown to clean HTML with a live preview and one-click copy. Free, safe, in your browser.
DeveloperHTML Entity Encoder / Decoder
Encode text to HTML entities or decode entities back to text — named, decimal and hex. Free, in your browser.
DeveloperJSON to Code — TypeScript, Go, Rust, Python & more
Paste JSON and generate type definitions in TypeScript, Go, Rust, Python, Java, Kotlin, Swift or C# — pick the language from a dropdown. Free, no upload.
DeveloperCron Expression Explainer
Explain any cron expression in plain English and preview its next runs, or build one from five fields — free, no upload, in your browser.
DeveloperText Encrypt & Decrypt (AES)
Encrypt and decrypt text with a password using AES-256-GCM — entirely in your browser, nothing is ever uploaded.
DeveloperText to Binary
Convert text to binary, hexadecimal, decimal or octal and back — instantly and privately, using UTF-8 so any character round-trips.
DeveloperString Escape / Unescape
Escape text for source code (newlines, tabs, quotes, backslashes, \uXXXX) and unescape it back — instantly, in your browser.
DeveloperURL Parser
Break a URL into protocol, host, port, path, fragment and a table of query parameters — instantly and privately.
DeveloperHTTP Status Codes
A searchable reference of HTTP status codes — 200, 301, 404, 500 and more — with plain-language meanings. In your browser.
Developer3D Tiles Viewer & Georeferencer (move + save tileset.json)
View a 3D Tiles model (tileset.json + b3dm), move it to the right WGS84 coordinates, two-point align it and save the new tileset.json. Free, in your browser.
DeveloperBitwise Calculator (AND, OR, XOR, NOT, Shift)
Compute AND, OR, XOR, NAND, NOR, XNOR, NOT, shifts and rotates on two 32-bit integers — result in decimal, hex, octal and binary, 100% in your browser.
DeveloperASCII Table
Searchable ASCII table (codes 0–127) with decimal, hex, binary, and the character or control-code name — runs 100% in your browser with no upload.
DeveloperCSV to Markdown Table
Convert CSV data into a clean GitHub-flavored Markdown table with header and delimiter options — runs 100% in your browser with no upload.
DeveloperHTML to Text Converter (Strip HTML Tags)
Paste HTML and instantly get clean plain text with tags removed, entities decoded and line breaks preserved — runs 100% in your browser, nothing is uploaded.
DeveloperPassword Strength & Entropy Checker
Check how strong a password is — its entropy in bits, a Very weak to Very strong rating, and the character sets it uses. Free, no upload, in your browser.
DeveloperUnicode Character Inspector
Break text into Unicode code points and see the U+ codepoint, decimal, UTF-8 bytes, HTML entity and Unicode block of every character. Free, in your browser.
DeveloperHMAC Generator (SHA-256, SHA-512, SHA3-256, MD5 and more)
Generate an HMAC with a secret key across nine hashes — SHA-256, SHA-512, SHA3, MD5, RIPEMD-160 — as hex, Base64, Base64URL or binary. 100% in your browser.
DeveloperIP Subnet Calculator (IPv4 CIDR)
Enter an IPv4 CIDR like 192.168.1.10/24 and get the network, broadcast, host range, subnet mask, wildcard mask and host count. Free, in your browser.
DeveloperLine Numberer
Add sequential line numbers to any text with custom start, separator, and zero-padding — runs 100% in your browser with no upload.
DeveloperMIME Type Lookup
Look up the MIME type for a file extension, or the extension for a content type, in a searchable table of common web, image, audio, video and font types.
DeveloperQuery String Builder
Build a properly URL-encoded query string from key/value pairs, with an optional base URL — runs 100% in your browser, nothing is uploaded.
DeveloperUTM Builder — Campaign URL Tracking Link Generator (free, no sign-up)
Build UTM campaign tracking links for GA4, email and social — source/medium presets, lowercase cleanup, bulk generation and a QR code. Free, in your browser.
DeveloperIBAN Validator & Formatter — Check an International Bank Account Number (free, no upload)
Validate any IBAN with the ISO 13616 mod-97 checksum and country length rules, see which country it belongs to, and format it in groups of four. No upload.
DeveloperMarkdown Table Generator
Build a GitHub-flavored Markdown table in a visual grid — add rows and columns, type the cells, set per-column alignment, and copy it. Free, in your browser.
DeveloperHTML Minifier
Minify HTML to shrink page size — comments stripped and whitespace collapsed, while pre, script, style and conditional comments are kept. Free, no upload.
DeveloperSVG to JSX Converter
Convert an SVG icon or any HTML snippet to JSX — camelCased attributes, inline styles as a style object, optional component wrapper. Free, in your browser.
DeveloperJavaScript Keycode Info — event.key, code & keyCode Inspector
Press any key to see its JavaScript event.key, event.code, keyCode, which, location and modifier flags — a keycode.info-style inspector, in your browser.
Developerbcrypt Hash Generator & Password Verifier (free, no upload)
Hash a password with bcrypt at the cost factor you pick, and verify a password against an existing $2a$/$2b$/$2y$ hash. Free, no upload, in your browser.
DeveloperUser-Agent Parser — Decode Browser, OS & Device from a UA String (free)
Decode any User-Agent string into browser, OS, device, engine and CPU details — prefilled with your own UA, with copy-as-JSON. Free, in your browser.
DeveloperRSA Key Pair Generator (2048/4096)
Generate an RSA public/private key pair in PEM format — runs 100% in your browser with the Web Crypto API, nothing is uploaded.
DeveloperTOTP / 2FA Code Generator
Generate live TOTP two-factor codes (RFC 6238) from a Base32 secret, with a countdown and an otpauth:// enrollment QR. Free, no upload, in your browser.
DeveloperDocker Run to Compose — Convert a docker run Command to docker-compose.yml (free, no upload)
Convert a docker run command into an equivalent docker-compose.yml — ports, volumes, env vars, name, restart, network and workdir. Free, in your browser.
DeveloperChmod Permission Calculator
Convert Unix file permissions between symbolic (rwxr-xr--) and octal (754) with a live checkbox grid — runs 100% in your browser with no upload.
DeveloperJSON Diff
Compare two JSON documents and see every added, removed and changed key with its full path, optionally ignoring array order — 100% in your browser, no upload.
DeveloperPunycode Converter (IDN ⇆ xn--)
Convert internationalized domain names between Unicode and Punycode (the xn-- ASCII form) in both directions — runs 100% in your browser, no upload.
DeveloperHex Dump
Turn any text or file into an xxd-style hex dump with byte offsets, hex bytes and an ASCII gutter — and decode one back. Free, in your browser.
DeveloperJSON to XML Converter
Convert JSON into clean, indented XML with a live preview and one-click copy — runs 100% in your browser with no upload.
DeveloperData Extractor — Pull Emails, URLs & More from Text
Extract emails, URLs, domains, IPs, MAC addresses, dates, phones, hashtags, mentions, file paths or hashes from any text. Free, in your browser, no upload.
DeveloperDelimiter Converter
Convert tabular text between comma, tab, semicolon, pipe, space and new-line delimiters, or any separator you type, with a live preview. No upload.
DeveloperMeta Tags Generator
Generate SEO, Open Graph and Twitter Card meta tags — 12 page types, image and account properties, and a preview of the card as six sites will draw it.
Developerrobots.txt Generator — Build a Crawler Rules File Online
Generate a valid robots.txt file with User-agent, Allow, Disallow, Crawl-delay and Sitemap directives — runs 100% in your browser, no upload, no sign-up.
DeveloperSQL IN Clause Generator
Paste a list of values, one per line, and build a SQL IN (...) or NOT IN (...) clause — with quoting, a column name, and long lists split into groups of 1,000.
DeveloperCSV to SQL INSERT Generator
Paste CSV and instantly build SQL INSERT statements with a table name, header, and delimiter options — runs 100% in your browser with no upload.
Developer.env to JSON Converter
Convert a .env file to JSON and back with two live, editable boxes — runs 100% in your browser with no upload.
DeveloperMarkdown Table of Contents Generator
Generate a nested Markdown table of contents with anchor links from your headings instantly — runs 100% in your browser with no upload.
Developercurl Command Builder
Build a ready-to-run curl command from a method, URL, headers and body — runs 100% in your browser, nothing is uploaded.
DeveloperJWT Generator (HS256/384/512)
Create a signed HMAC JWT from a JSON payload and secret — runs 100% in your browser, nothing is uploaded.
DeveloperJSON Flatten & Unflatten
Flatten nested JSON into dot/bracket key paths and rebuild it back, with a live two-way preview — runs 100% in your browser with no upload.
DeveloperTwo's Complement Converter (8/16/32-bit Binary & Hex)
Convert a signed integer to its two’s complement binary and hex at 8, 16 or 32 bits, and decode a bit pattern back to signed decimal. Free, no upload.
DeveloperGray Code Converter (Decimal ⇄ Binary ⇄ Gray Code)
Convert between decimal, binary and Gray code with instant three-way boxes — runs 100% in your browser, nothing is uploaded.
DeveloperINI to JSON Converter
Convert INI config files into clean JSON with a live preview and one-click copy — runs 100% in your browser with no upload.
DeveloperResistor Color Code Calculator
Pick the color of each band on a 4- or 5-band resistor and instantly read its resistance in ohms plus tolerance — runs 100% in your browser with no upload.
DeveloperCSS Minifier
Minify CSS to shrink file size — strips comments and whitespace and collapses rules, running 100% in your browser with no upload.
DeveloperISBN Validator (ISBN-10 & ISBN-13)
Check whether a book's ISBN-10 or ISBN-13 has a correct checksum and instantly see which standard it is — runs 100% in your browser, nothing is uploaded.
DeveloperLuhn Checker & Check Digit Calculator
Validate a card, IMEI or account number with the Luhn checksum and compute its check digit — runs 100% in your browser, no upload.
DeveloperBBCode to HTML Converter
Convert BBCode markup to clean HTML instantly — runs 100% in your browser with no upload and no sign-up.
DeveloperJSONL to JSON Array Converter
Convert JSON Lines (NDJSON) to a pretty JSON array and back, two ways, live as you type — runs 100% in your browser with no upload.
DeveloperSemver Checker & Version Comparator
Parse a semantic version into its major, minor, patch, prerelease and build parts and compare two versions by precedence. Free, in your browser, no signup.
DeveloperYAML ⇄ JSON Converter
Convert YAML to JSON, JSON to YAML, or YAML to XML or CSV — open a file or load a URL, choose the indent. 100% in your browser, no upload.
DeveloperSQL Formatter & Beautifier
Beautify or minify SQL in 20 dialects — keyword and identifier case, indent width and style, comment removal, Python/PHP string output. All in your browser.
DeveloperHTML Formatter & Minifier
Beautify HTML with clean indentation or minify it to one compact line — pre and textarea preserved, inline JS/CSS re-indented or left alone. Free, no upload.
DeveloperXML Formatter
Beautify, minify or validate XML at any indent from 0 to 10 spaces or a tab — paste, format, copy. 100% in your browser, no upload.
DeveloperBarcode Generator
Generate barcodes in 15 symbologies — Code 128, EAN/UPC, Code 39, ITF-14, MSI, Pharmacode, Codabar. Download as PNG or SVG. 100% in your browser, no upload.
DeveloperJavaScript Beautifier
Pretty-print minified JavaScript or JSON: 1–10 space or tab indent, four brace styles, line wrapping, JSX. 100% in your browser, no upload.
DeveloperXPath Tester
Evaluate an XPath expression against pasted XML or HTML and list every matching node — 100% in your browser, no upload.
DeveloperJSON Repair
Fix broken JSON — trailing commas, comments, single quotes, unquoted keys — 100% in your browser, no upload
DeveloperJavaScript Minifier
Minify and compress JavaScript with Terser — 100% in your browser, no upload
DeveloperJSON Schema Generator
Infer a JSON Schema from a sample JSON payload — draft 2020-12 or draft-07, with automatic string format detection — 100% in your browser, no upload
DeveloperMock Data Generator
Generate rows of fake data — names, emails, cities, UUIDs, dates — as JSON, CSV or SQL for seeding a database or stubbing an API. Free, no upload.
Developercurl to Code Converter
Convert a curl command into ready-to-run fetch, Node.js, Python, Go, or PHP code — 100% in your browser, no upload
DeveloperSitemap.xml Generator — Build a Sitemap From a URL List
Generate a valid sitemap.xml from a list of URLs, apply an optional default changefreq and priority, then copy or download it — 100% in your browser, no upload
DeveloperHTTP Basic Auth Header Generator & Decoder (free, no upload)
Turn a username and password into an Authorization: Basic header and Base64 token, or decode a header back into credentials. UTF-8 safe, free, no upload.
DeveloperBIP39 Mnemonic Generator and Validator
Generate and validate BIP39 mnemonic seed phrases of 12 to 24 words, with crypto-strong randomness and full checksum checking. Free, in your browser.
DeveloperIP Address Converter (IPv4 & IPv6)
Convert one IP address between dotted-decimal, integer, hex, binary and IPv4-mapped IPv6 — plus IPv6 expand/compress — 100% in your browser, no upload
DeveloperYAML Formatter & Validator
Format, validate and pretty-print YAML at any indent from 1 to 10 spaces, with optional key sorting and line-numbered errors. Comments kept, output stays YAML.
DeveloperDevice Info — Live Screen, Browser, OS & System Readout
See a live readout of your own device — screen resolution, viewport, pixel ratio, CPU cores, memory, browser, OS and time zone. Free, nothing is uploaded.
DeveloperURL & IP Defanger and Refanger
Defang and refang URLs, domains, IP addresses and emails for safe IOC sharing — http becomes hxxp and every dot becomes [.], or reverse it. Free, no upload.
DeveloperShannon Entropy Calculator
Measure the Shannon entropy in bits per byte of any text or dropped file — a reading of 7.5 or above suggests encrypted or compressed data. Free, no upload.
DeveloperXOR Cipher — Encrypt, Decrypt & Single-Byte Brute Force
XOR text or hex against a repeating key, see the result as hex and printable text, and crack single-byte XOR with a brute-force ranker. Free, no upload.
DeveloperEmail Normalizer
Canonicalize email addresses — strip Gmail dots and +tags, fold googlemail to gmail, and collapse duplicate contacts — 100% in your browser, no upload
DeveloperSafeLink Decoder — Unwrap Outlook SafeLinks & Proofpoint URLs
Unwrap Outlook SafeLinks and Proofpoint URL Defense links to the real destination — paste one link or a whole email body. Free, no upload, in your browser.
DeveloperIPv6 ULA Generator (RFC 4193)
Generate a random RFC 4193 IPv6 unique local address /48 prefix with a crypto-strong Global ID, plus an example /64 subnet and host. Free, no upload.
DeveloperIP Range to CIDR Converter
Convert an IPv4 start-end range into the smallest set of CIDR blocks that covers it, and expand any CIDR back to its first and last address and count.
DeveloperGit Cheat Sheet
Searchable reference of the Git commands you forget — commit, branch, merge, rebase, stash and undo — in plain language with one-click copy. Free, no signup.
DeveloperRegex Cheat Sheet
A searchable regex cheat sheet with copy-ready examples for anchors, character classes, quantifiers, groups, lookaround and flags. Free, in your browser.
DeveloperDiscord Timestamp Generator
Turn any date and time into Discord dynamic timestamp markup in all seven styles, each with a live preview and one-click copy — 100% in your browser, no upload
DeveloperRandom Port Generator
Generate a random port number in the default 1024–65535 range or a custom range, plus well-known ports to avoid — 100% in your browser, no upload
DeveloperJSON Schema Validator
Validate a JSON document against a JSON Schema and see every violation with its exact path — draft-07 and 2020-12 supported. Free, in your browser, no upload.
DeveloperJSONPath Tester
Run a JSONPath expression against pasted JSON and list every matching value with a count — 100% in your browser, no upload.
DeveloperX.509 Certificate Decoder
Decode a PEM X.509 or SSL/TLS certificate — subject, issuer, validity, SAN, key usage, signature algorithm and SHA-256 fingerprint. Free, no upload.
DeveloperFile Type Detector — Identify Files by Magic Bytes
Identify a file by its magic bytes — find the real format even when the extension is wrong or missing, and get warned on mismatches. Free, no upload.
DeveloperProtobuf Decoder
Decode a raw protobuf message from hex or base64 with no .proto schema — field numbers, wire types, strings and nested sub-messages. Free, no upload.
DeveloperBinary Strings Extractor
Extract printable ASCII and UTF-16 strings from any binary, firmware or malware sample — like the Unix strings command, with a length filter. Free, no upload.
DeveloperPhone Number Formatter & Validator — E.164, National & International (free)
Parse and validate a phone number, then format it as E.164, national, international and RFC3966 tel: URI, with country and line type — no upload
DeveloperWYSIWYG HTML Editor
Write rich text in a visual editor and get clean, safe HTML — bold, italic, headings, lists and links, with scripts and inline styles stripped. No upload.
DeveloperXSD Validator
Validate an XML document against an XSD schema and list every violation with its line number, using the real libxml2 engine. Free, no upload.
DeveloperMAC Address Vendor Lookup
Look up the hardware vendor behind any MAC address in the bundled IEEE OUI registry, or search the registry by company name. Free, in your browser, no upload.
DeveloperEC / ECDSA Key Pair Generator (P-256, secp256k1, Ed25519)
Generate an EC key pair on nine curves — P-256, secp256k1, brainpool, SM2, Ed25519 — as PEM, JWK, OpenSSH or raw bytes, optionally encrypted. Free, no upload.
DeveloperJWK to PEM Converter — RSA & EC, Both Directions
Convert keys between JWK and PEM (SPKI / PKCS#8) in both directions, for RSA and EC — handy when wiring up JWT, OIDC and JWKS. Free, no upload.
DeveloperMAC Address Generator
Generate random MAC addresses in bulk — pick the separator, the case, a fixed 1–5 octet prefix, and the unicast and locally-administered bits. Free, no upload.
DeveloperCBOR Decoder & Encoder
Decode CBOR from hex or base64 into readable JSON and encode JSON back to canonical CBOR hex — for WebAuthn, COSE and IoT payloads. Free, no upload.
DeveloperCSR Decoder — Inspect a PKCS#10 Certificate Signing Request
Decode a PEM or Base64 CSR (PKCS#10) to read its subject DN, subject alternative names, key algorithm and size, and signature algorithm. Free, no upload.
DeveloperArgon2 Password Hash Generator & Verifier (free, no upload)
Hash a password with Argon2id, Argon2i or Argon2d at your own memory, time and parallelism cost, or verify one against an existing hash. Free, in your browser.
DeveloperPGP Encryption Tool — Generate Keys, Encrypt, Decrypt, Sign and Verify
Generate an OpenPGP key pair (Curve25519 or RSA), encrypt and decrypt messages, and sign or verify a signature. Free, in your browser, no upload.
Developer.gitignore Generator
Build a .gitignore from common stack, OS and editor templates — 100% in your browser.
DeveloperJSON to Zod Schema
Turn a sample JSON object into a Zod schema with an inferred TypeScript type — 100% in your browser.
DeveloperHTML to JSX Converter
Convert HTML into React/Preact JSX — class→className, style objects, self-closed tags. 100% in your browser.
DeveloperSmart Decode (Magic Decoder)
Auto-detect and decode Base64, hex, URL-encoding, JWT or HTML entities — layer by layer, 100% in your browser.
Aspect Ratio Calculator
Work out aspect ratios and resize dimensions — one click for 16:9, 4:3, 1:1, 9:16, 3:2, 21:9 or A4, or find the missing width or height, with the shape drawn.
CalculatorsPercentage Calculator
Six percentage calculations on one page — X% of a value, what percent of what, change, difference, add or take off a percent, work back to the original.
CalculatorsAge Calculator
Exact age in years, months, weeks and days from a date of birth — plus the total in months, weeks, days, hours, minutes and seconds, and your next birthday.
CalculatorsDate Difference Calculator
Find the time between two dates in days, working days, weeks, months, years and hours — with your own weekend and your own days off. Free, in your browser.
CalculatorsDiscount Calculator
Work out the sale price after one discount or several stacked, the percent off between two prices, or the original price. Free, no sign-up, in your browser.
CalculatorsGCD & LCM Calculator
Find the GCD and LCM of any list of integers and see the working — the prime factor table, the Euclidean algorithm step by step, and every shared divisor.
CalculatorsPrime Checker & Factorization
Check whether a number is prime, see its prime factorisation and every divisor, find the nearest primes either side, and list the primes between two numbers.
CalculatorsVAT Calculator
Add or remove VAT, GST or sales tax to get the gross, net and tax amounts instantly, with one-click rates for the UK, Germany, Japan and more. Free, no signup.
CalculatorsCompound Interest Calculator
Ten compounding frequencies, a deposit schedule of its own, tax and inflation — or solve for the principal, rate or time needed. All in your browser.
CalculatorsFraction Simplifier
Reduce a fraction to lowest terms, add, subtract, multiply and divide fractions, and convert between fractions and decimals. Free, no sign-up, in your browser.
CalculatorsMargin & Markup Calculator
Turn cost and revenue into profit, profit margin % and markup %, or work out the revenue needed to hit a target margin — 100% in your browser, no upload.
CalculatorsStatistics Calculator
Paste numbers for the count, sum, mean, median, mode, range, quartiles, IQR, variance and standard deviation — with a histogram, a box plot and the outliers.
CalculatorsFactorial, Permutations & Combinations Calculator
Compute n!, nPr and nCr exactly with big-integer arithmetic, plus the digit count and scientific notation for numbers far too long to print. Free, no signup.
CalculatorsQuadratic Equation Solver
Solve any quadratic ax² + bx + c = 0 for its roots, discriminant and vertex, see the parabola drawn, and follow the formula step by step. Free, no upload.
CalculatorsISO Week Number Calculator
Find the week number of any date, or the dates in any week, under ISO 8601, the US convention or a Saturday start — with the month drawn as a calendar to check.
CalculatorsCircle Calculator
Enter a radius, diameter, circumference or area and get the other three — with the circle drawn, the unit label you pick, and arc, chord and sector areas.
CalculatorsPythagorean Theorem Calculator
Solve a right triangle from any two of its sides, angles, area or perimeter — drawn to scale, with the working shown, the altitude and the circle radii.
CalculatorsTime Ago Calculator
Turn a date into a phrase like 3 hours ago, or a phrase or raw timestamp back into a date — with local time, UTC and Unix seconds. Free, in your browser.
CalculatorsAdd or Subtract Days Calculator
Add or subtract years, months, weeks and days from a date — or count forward in business days with your own weekend and days off. Free, in your browser.
CalculatorsLeap Year Checker
Instantly check whether any year is a leap year, see why, how many days it has, and the next leap years — runs 100% in your browser with no upload.
CalculatorsSlope Calculator (Two Points)
Find the slope, y-intercept, equation and angle of the line through two points — with the line drawn, plus the distance, midpoint and perpendicular slope.
CalculatorsBusiness Days Calculator
Count the working days between two dates with your own weekend and your own days off, or find the date N business days away. Free, in your browser, no upload.
CalculatorsDay of the Week Finder
Find out what day of the week any date falls on, plus its day-of-year and whether it is a weekend — runs 100% in your browser with no upload.
CalculatorsDistance & Midpoint Calculator
Calculate the straight-line distance and midpoint between two 2D points from their x and y coordinates — runs 100% in your browser with no upload.
CalculatorsFibonacci Sequence Generator & Nth Term Calculator
Generate the first N Fibonacci numbers or find the exact Nth term with BigInt precision — runs 100% in your browser with no upload.
CalculatorsProportion Calculator (a/b = c/d)
Solve a proportion a/b = c/d by entering any three values and leaving one blank — runs 100% in your browser with no upload.
CalculatorsDays in Month Calculator
Instantly find how many days are in any month of any year, with leap years handled automatically — runs 100% in your browser with no upload.
CalculatorsOhm's Law Calculator
Enter any two of voltage, current, resistance, or power and this Ohm's law calculator instantly finds the other two — runs 100% in your browser with no upload.
CalculatorsScientific Notation Converter
Convert any number to and from scientific and engineering notation instantly — runs 100% in your browser with no upload.
CalculatorsZodiac Sign Finder
Find your Western star sign and Chinese zodiac animal from any birth date — runs 100% in your browser with no upload.
CalculatorsGolden Ratio Calculator (Phi 1.618)
Enter the longer, shorter, or whole segment and instantly get all golden-ratio (phi = 1.618) values — runs 100% in your browser with no upload.
CalculatorsMoon Phase Calculator
Find the moon phase and approximate illumination percentage for any date — runs 100% in your browser with no upload.
CalculatorsWeighted Average Calculator
Enter value and weight pairs to instantly compute a weighted average and total weight — runs 100% in your browser with nothing uploaded.
CalculatorsLogarithm Calculator (log any base, ln, log10)
Calculate the logarithm of any number in any base, plus natural log (ln) and log base 10 — runs 100% in your browser with no upload.
CalculatorsNth Root Calculator
Calculate the square root, cube root, or any nth root of a number instantly — runs 100% in your browser with no upload.
CalculatorsArithmetic Sequence Calculator
List every term, find the Nth term and add up an arithmetic sequence from its first term and common difference. Free, in your browser, nothing uploaded.
CalculatorsTime Duration Calculator (Add & Subtract HH:MM:SS)
Add and subtract time durations in HH:MM:SS or MM:SS, one per line with an optional + or −, and get the running total live. Free, in your browser.
CalculatorsEaster Date Calculator
Find the exact date of Western (Gregorian) Easter Sunday for any year using the Meeus/Jones/Butcher algorithm — runs 100% in your browser with no upload.
CalculatorsGeometric Sequence Calculator
List every term, find the Nth term, and compute the sum of a geometric sequence from its first term and common ratio — runs 100% in your browser with no upload.
CalculatorsSimple Interest Calculator
Work out the interest and the total amount on a principal from an annual rate and a term in years, months or days. Free, no sign-up, in your browser.
CalculatorsTime Card Calculator
Enter clock-in and clock-out times with optional break minutes to get decimal hours worked per day and a weekly total — 100% in your browser, no upload.
CalculatorsJulian Day Number Converter
Convert any Gregorian calendar date to its astronomical Julian Day Number and back, instantly — runs 100% in your browser with no upload.
CalculatorsSignificant Figures Rounder
Round any number to a chosen number of significant figures instantly — runs 100% in your browser with no upload.
CalculatorsBMI Calculator
BMI from height and weight, metric or imperial — the WHO class, BMI Prime, ponderal index, healthy weight range, and how much to gain or lose. No upload.
CalculatorsLoan & Mortgage Calculator
Monthly payment, total interest and a dated amortization schedule for any loan or mortgage — biweekly and weekly options, PMI, taxes, APR and CSV. No upload.
CalculatorsTip Calculator
Work out the tip, total and per-person amount for any bill, with quick 10–25% presets and bill splitting — 100% in your browser, no upload.
CalculatorsCalorie Calculator (TDEE & BMR)
Estimate your daily calorie needs — BMR, maintenance (TDEE) and weight-loss or gain targets — using the Mifflin–St Jeor equation, 100% in your browser.
CalculatorsGPA Calculator
Calculate your weighted grade point average on the 4.0 scale from each course's letter grade and credit hours — 100% in your browser, no upload.
CalculatorsSalary Calculator — Hourly ↔ Annual Pay Converter
Convert pay between hourly, daily, weekly, monthly and annual — set your own hours per week and weeks per year. Free, instant and 100% in your browser.
CalculatorsRunning Pace Calculator — min/km, min/mile & Finish Times
Enter a distance and time to get your pace per km and per mile, speed, and predicted 5K, 10K, half and full marathon finish times. Free, in your browser.
CalculatorsGrade Calculator — Test Score % and Final Grade Needed
Turn correct answers into a percentage and letter grade, or work out the score you need on the final to hit your target. Free, instant, in your browser.
CalculatorsFuel Cost Calculator — Trip Gas & Petrol Cost
Estimate what a trip costs in fuel from distance, fuel economy and price — miles or km, mpg, L/100km or km/L — split per passenger. Free, in your browser.
CalculatorsBody Fat Calculator — U.S. Navy Method
Estimate your body fat percentage from tape measurements using the U.S. Navy circumference method — metric or imperial. Free, private, 100% in your browser.
CalculatorsSleep Calculator — Bedtime & Wake-Up Time
Find the best time to sleep or wake based on 90-minute sleep cycles. Enter a time and get bedtime or wake-up suggestions. Free, in your browser.
CalculatorsElectricity Cost Calculator — Appliance Running Cost
Work out what an appliance costs to run per day, month and year from its wattage, hours of use and your electricity rate. Free, 100% in your browser.
CalculatorsPaint Calculator — How Much Paint You Need
Estimate how many gallons or litres of paint a room needs from wall size, doors, windows and coats. Metric or imperial, free, in your browser.
CalculatorsConcrete Calculator — Cubic Yards & Bags
Calculate concrete volume for a slab or footing in cubic yards, metres and feet, plus how many 40/60/80 lb bags you need. Free, in your browser.
CalculatorsPregnancy Due Date Calculator (Naegele’s Rule)
Estimate your pregnancy due date from your last menstrual period, and see how many weeks along you are. An estimate, not medical advice. In your browser.
CalculatorsSquare Footage Calculator — Area of a Room
Add up the square footage (and square metres) of one or more rooms, with an optional total cost per square foot. Free, in your browser.
CalculatorsTile Calculator — Tiles & Boxes Needed
Work out how many tiles and boxes you need for a floor or wall from the area, tile size and a waste allowance. Metric or imperial, in your browser.
CalculatorsIdeal Weight Calculator (Devine, Robinson, Miller, Hamwi)
Estimate ideal body weight from height and sex using four classic clinical formulas, plus the healthy BMI weight range. Free, in your browser.
CalculatorsUnit Price Calculator — Cost Per Unit & Best Value
Compare products by price per unit to find the best value. Enter each option’s price and amount; the cheapest per unit is highlighted. In your browser.
CalculatorsWater Intake Calculator — Daily Water Needs
Estimate how much water to drink a day from your weight, exercise and climate — in litres, ounces and cups. A general guide, in your browser.
CalculatorsOne-Rep Max (1RM) Calculator + Training Loads
Estimate your one-rep max from a weight and reps using the Epley and Brzycki formulas, with a percentage table of training loads. In your browser.
CalculatorsDog Age Calculator — Dog Years to Human Years
Convert your dog’s age to human years using a size-adjusted model and the 2019 epigenetic-clock formula. Free, in your browser.
CalculatorsTimer, Stopwatch & Pomodoro
A countdown timer, a stopwatch with laps, and a Pomodoro focus cycle with a beep and optional desktop alert — 100% in your browser, no upload.
CalculatorsMath Expression Evaluator
Evaluate free-form math expressions with functions, constants and degree-based trig — one per line, with variables. 100% in your browser, no upload
CalculatorsGreat-Circle Distance & Bearing Calculator
Find the great-circle distance and initial compass bearing between two latitude and longitude points, in kilometers, miles and meters. Free, no upload.
CalculatorsTime to Decimal Converter (HH:MM ⇄ Hours)
Convert clock time like 2:30 to decimal hours (2.5) and back for timesheets and payroll — 100% in your browser, no upload.
CalculatorsETA Calculator
Estimate when a task will finish from how much is done, the total, and the time elapsed — 100% in your browser, no upload
Number Base Converter
Convert numbers between binary, octal, decimal, hexadecimal or any base from 2 to 64 — even very large ones. Free, in your browser.
ConvertersRoman Numeral Converter
Convert numbers to Roman numerals and back (1–3999) — instantly, in your browser, with malformed-numeral validation.
ConvertersUnit Converter
Convert cm to inches, kg to lbs, °C to °F, GiB to GB — 178 units across 23 categories, searchable by name, one click for the common pairs. In your browser.
ConvertersCoordinate Converter — WGS84, Korean TM (EPSG:5186), UTM
Convert between WGS84 lat/lon, Korean TM (EPSG:5185-5188), UTM-K 5179, UTM and legacy Bessel coordinates, with degrees to DMS and a map preview. Free.
ConvertersNumber to Words Converter
Convert any number into spelled-out words in English or Korean, from zero to the billions and beyond — runs 100% in your browser with no upload.
ConvertersJSON ⇄ TOML Converter
Convert JSON to TOML and TOML back to JSON, both directions, with clear error messages — 100% in your browser, no upload.
ConvertersTime Zone Converter
Convert a date and time from one time zone to another with the live UTC offset — runs 100% in your browser with no upload.
ConvertersCooking Measurement Converter
Convert recipe amounts between cups, tablespoons, teaspoons, millilitres and fluid ounces, or to grams for flour, sugar and butter — in your browser, no upload.
ConvertersFuel Economy Converter
Convert fuel economy between US MPG, UK MPG, km/L and L/100km instantly — runs 100% in your browser with no upload.
ConvertersCSV to JSON Converter
Convert CSV or TSV to JSON — objects, keyed, column arrays, JSON Lines or minified. Sort, skip, limit, 10 file encodings. In your browser, no upload.
ConvertersXML to JSON Converter
Convert XML to JSON in your browser — attributes, repeated tags, 5 spacing choices, optional root unwrap. Paste, open a file, or load a URL. No upload.
ConvertersBase32 & Base58 Encoder / Decoder
Encode and decode text with Base32 (RFC 4648) or Base58 (Bitcoin alphabet) — 100% in your browser, nothing uploaded.
ConvertersExcel to CSV / JSON Converter
Convert Excel .xlsx spreadsheets to CSV or JSON and back — 100% in your browser, no upload
ConvertersGzip, Zlib & Deflate Compressor
Compress or decompress text with gzip, zlib or raw DEFLATE, with base64 output and a live size ratio — 100% in your browser, no upload
ConvertersFile to Base64
Encode any file to a Base64 string or data: URI, and decode Base64 back to a downloadable file — 100% in your browser, no upload.
ConvertersCSV Transpose
Swap the rows and columns of a CSV or TSV table — 100% in your browser, no upload.
ConvertersQuoted-Printable Encoder / Decoder
Encode or decode MIME Quoted-Printable text and =?UTF-8?Q?…?= email headers — 100% in your browser, no upload
ConvertersCSV Validator
Find ragged rows, wrong column counts and empty cells in a CSV — 100% in your browser, no upload
ConvertersFile Splitter & Joiner
Split any file into fixed-size or N chunks and rejoin them — 100% in your browser, no upload
ConvertersCSV to TSV, XML & YAML Converter
Convert CSV or TSV to TSV, XML, or YAML — 100% in your browser, no upload.
ConvertersCharset Converter — Fix Mojibake
Fix mojibake — decode legacy code pages such as Windows-1252, ISO-8859, Shift_JIS, EUC-KR, GBK, Big5 and KOI8-R to Unicode. Free, no upload, in your browser.
ConvertersPHP Serialize ⇄ JSON Converter
Convert PHP serialize() output to JSON and JSON back to a serialized string — read the arrays and objects in sessions, cookies and cache. Free, no upload.
ConvertersZIP Maker & Extractor
Create a ZIP from your files, or unpack and peek inside any .zip, .jar or .docx — 100% in your browser, no upload
ConvertersAudio Converter
Convert audio to MP3, WAV, FLAC, AIFF, M4A or OGG in your browser, with trim, fade and normalise built in — no ffmpeg to install, no upload, no sign-up.
Color Converter (HEX, RGB, HSL)
One color in 13 formats — HEX, RGB, HSL, HWB, OKLCH, LAB, LCH, XYZ, LUV, CMYK — with harmonies, tints and shades and WCAG contrast. Free, in your browser.
ColorColor Contrast Checker (WCAG)
Check color contrast against WCAG AA and AAA for accessible text — live ratio, pass/fail badges and a preview, in your browser.
ColorColor Shades & Tints Generator
Generate 3–20 tints and shades from any hex color, set the step size, copy a swatch or export the ramp as CSS or JSON — 100% in your browser, no upload.
ColorColor Mixer — Blend Two Colors and Every Step Between
Mix two colours at any ratio, read the result as HEX, RGB and HSL, and copy the whole ramp between them. 100% in your browser, no upload.
ColorColor Scheme Generator
Generate complementary, split-complementary, triadic, analogous and tetradic color schemes from any hex color, and copy each swatch with one click.
ColorRandom Color Palette Generator
Generate a random, harmonious palette of 2 to 10 colours with one click and copy any hex code instantly — runs 100% in your browser with no upload.
ColorImage Color Palette Extractor
Extract a dominant color palette from any photo or image as HEX, RGB, and HSL swatches with their share and one-click copy — 100% in your browser, no upload
CSS Gradient Generator
Build linear, radial, conic and repeating CSS gradients — stops with transparency, presets, a live preview and copy-paste code. No upload, in your browser.
CSS & DesignCSS Box Shadow Generator
Create CSS box-shadow with live preview — stack multiple layers, set offset, blur, spread, colour, opacity and inset, then copy the code. In your browser.
CSS & DesignCSS Border Radius Generator
Round corners visually — drag the handles or the per-corner sliders, px or %, live preview and copy-paste CSS. Free, no upload, in your browser.
CSS & DesignCSS clamp() Generator for Fluid Typography
Generate a responsive CSS clamp() for fluid font sizes and spacing from min/max size and viewport values — runs 100% in your browser, no upload.
CSS & DesignCSS Loader & Spinner Generator
Generate a pure-CSS loading spinner from 31 styles — ring, dots, bars, ripple, orbit, coin flip and more — with live preview and copy-paste CSS. No JavaScript.
CSS & DesignCSS Clip-Path Generator
Generate CSS clip-path shapes visually — pick a polygon, circle, ellipse or inset, drag the vertices, and copy the clip-path code. 100% in your browser.
CSS & DesignCubic Bezier Generator
Visually build a CSS cubic-bezier() easing curve — drag two control points, pick a preset, preview the motion, and copy the timing function, in your browser.
CSS & DesignCSS Filter Generator
Build a CSS filter with sliders for blur, brightness, contrast, grayscale, sepia, saturate, hue-rotate, invert and opacity, then copy it. Free, in your browser.
CSS & DesignCSS text-shadow Generator with Live Preview
Stack several CSS text-shadows with sliders for offset, blur, color and opacity, and copy the ready-to-paste declaration — runs 100% in your browser, no upload.
CSS & DesignCSS Triangle Generator with Live Preview
Generate a pure-CSS triangle with the border trick — pick the direction, width, height and color, see a live preview and copy the CSS. Free, in your browser.
CSS & DesignGlassmorphism CSS Generator
Frosted-glass CSS with live sliders for blur, saturation, transparency, tint, radius and shadow — copy the declarations or a whole .glass-card class rule.
CSS & DesignNeumorphism CSS Generator with Live Preview
Generate soft-UI neumorphism CSS with a live preview — set the base color, size, radius, distance, blur, intensity and shape. Free, in your browser.
CSS & DesignCSS Flexbox Generator with Live Preview
Build a CSS flexbox layout — flex-direction, justify-content, align-items, flex-wrap, gap, align-content, plus per-item order, grow, shrink, basis, align-self.
CSS & DesignCSS Transform Generator
Build a CSS transform from translate, rotate, scale, and skew sliders with a live preview and copyable code — runs 100% in your browser with no upload.
CSS & DesignCSS Transition Generator
Build a CSS transition shorthand from a property, duration, timing function, and delay, with a live hover preview — runs 100% in your browser with no upload.
CSS & DesignCSS Media Query Generator
Generate responsive CSS @media queries from min-width, max-width, orientation, and device presets — runs 100% in your browser with no upload.
CSS & DesignPX to REM & EM Converter
Convert between px, rem and em for any base font size and see all three equivalents instantly — runs 100% in your browser with no upload.
CSS & DesignCSS Line-Clamp Generator (Truncate Text to N Lines)
Truncate text to a set number of lines with an ellipsis — generate the -webkit-line-clamp CSS and watch it live. Free, no sign-up, in your browser.
CSS & DesignCSS Text Stroke (Outline) Generator with Live Preview
Generate a CSS text outline with -webkit-text-stroke — set the width, stroke color and fill color, see a live preview and copy the code. Free, in your browser.
CSS & DesignCSS Grid Generator
Build a CSS grid visually — size every column and row track in fr, px, auto or minmax, set the gap and alignment, preview it live and copy the CSS. Free.
CSS & DesignCSS Beautifier
Beautify minified or messy CSS, SCSS or Less with clean indentation and line-numbered syntax errors. 100% in your browser, no upload.
CSS & DesignSVG Blob Generator
Generate random organic SVG blobs: set points, contrast and colour or fill it with a photo, then copy or download the SVG — 100% in your browser, no upload
CSS & DesignSVG Wave Generator
Layered SVG waves for section dividers and hero backgrounds — set amplitude, wave count, complexity and per-layer opacity, then copy SVG or CSS, or save a PNG.
CSS & DesignMesh Gradient Generator
Create trendy multi-color mesh gradients from layered radial-gradients and copy the CSS — 100% in your browser, no upload
CSS & DesignCSS Pattern Generator
Generate pure-CSS background patterns — dots, grid, stripes, checkerboard, zigzag — with spacing, rotation and opacity controls. Free, in your browser.
CSS & DesignCSS Scrollbar Generator
Design a custom scrollbar and copy cross-browser CSS — thickness, radii, hover and pressed colours, borders, shadow. WebKit and Firefox, free, no upload.
CSS & DesignCSS Animation Generator
Generate CSS @keyframes animations from 22 presets — entrances, exits and attention seekers — or write your own keyframes. Live preview, free, in your browser.
CSS & DesignReact Native Shadow Generator
Visually design a React Native shadow and copy the style object — iOS shadow* props plus Android elevation — 100% in your browser, no upload
CSS & DesignCSS Toggle Switch Generator
Design a CSS toggle switch in seven designs — slider, iOS, Material, line, dot, inset, text labels — with size, color and transition controls. Free, no upload
CSS & DesignCSS Checkbox Generator
Design a custom checkbox in pure CSS — ten mark styles (tick, cross, square, dot, ring, dash), your colors, size and radius — copy the HTML and CSS. No upload.
CSS & DesignCSS Glitch Text Generator (Animated RGB-Split Effect)
Generate animated glitch text as pure CSS — RGB split, static, transformation or all in one — live preview, colour pickers, intensity and speed sliders. Free.
Morse Code Translator
Translate text to Morse code and back — instantly and privately in your browser, with letters, numbers and punctuation.
Fun & Text ArtCipher — Caesar, ROT13, Atbash, Vigenère, Affine, Rail Fence & More
Encode and decode text with eight classic ciphers — Caesar, ROT13, ROT47, Atbash, Vigenère, Affine, Rail Fence, A1Z26 and Bacon. Free, 100% in your browser.
Fun & Text ArtNATO Phonetic Alphabet Converter
Convert text into the NATO phonetic alphabet (Alpha, Bravo, Charlie…) to spell a name clearly over the phone or radio. Free, no sign-up, in your browser.
Fun & Text ArtASCII Art Text Banner Generator (FIGlet)
Turn text into big ASCII-art banners with 331 classic FIGlet fonts, searchable. Copy the result anywhere. 100% in your browser, no upload.
Fun & Text ArtMeme Generator
Meme generator: caption any image or GIF with any number of draggable text boxes, 8 fonts and 19 blank templates. Saves PNG, JPG or animated GIF. No upload.
Fun & Text ArtLeetspeak (l33t) Translator
Convert any text to leetspeak and back — a4 e3 i1 o0 s5 t7 and more — running 100% in your browser with no upload.
Fun & Text ArtPig Latin Translator
Translate English text to Pig Latin instantly, running 100% in your browser with no upload and no sign-up.
Fun & Text ArtClap Text Generator
Add 👏 clap 👏 emojis 👏 between 👏 words to make meme text — runs 100% in your browser with no upload.
Fun & Text ArtMocking Case (SpongeBob) Text Generator
Turn any text into aLtErNaTiNg mocking SpongeBob case for memes and sarcastic replies — runs 100% in your browser with no upload.
Fun & Text ArtFancy Text Generator — Bold, Cursive, Bubble & more
Turn text into fancy Unicode fonts — bold, italic, cursive, bubble, monospace, small caps, strikethrough, upside-down, zalgo, all at once. Copy anywhere.
Fun & Text ArtEmoji Picker — Copy & Paste
Search emojis by name and click to copy — hearts, faces, hands, symbols and more. Works in English and Korean, 100% in your browser.
What this is
MakerBox is a few hundred small tools that run entirely inside this tab. Nothing you open is uploaded. The PDF you merge, the photo you convert, the token you decode — the file is read by JavaScript in your browser, the work happens on your own machine, and the result is handed straight back to you. There is no account, no queue, and no server that has a copy.
That is not a privacy slogan, it is what makes the tools quick. A hundred-megabyte PDF does not have to travel anywhere before it can be compressed, so it is done in the time it takes to read it off your disk. It also means most of these work with the network off, and that an internal document is not somebody else's problem to store.
The exception is worth naming: a handful of tools load a large one-off file the first time you use them — a font for writing Korean into a PDF, a model for removing a background — and those come from this site, not from your file. Beyond that, if a tool ever needs to send something somewhere, it says so on the page before it does.