About MakerBox
MakerBox is 347 small, focused web tools — PDF, images, text, developer utilities, calculators, colour and CSS. Every one is free, needs no sign-up, and does one job.
Your files stay on your device
Most online tools upload your file to a server, do the work there, and send something back.MakerBox does not. Each tool is JavaScript that your browser downloads once and then runs on your own machine: the file is read with the File API, the work happens in your tab, and the result is handed to you as a download. There is no upload step, no queue, and no server that ever holds a copy — because there is no server doing the work at all. The pages are static files.
That is also why it can be quick. A hundred-megabyte PDF does not travel anywhere before it can be compressed, so no upload bandwidth or free-tier quota stands in the way. How long the work itself takes depends on the file, the job and your device, and some tools set an input size limit of their own.
You do not have to take our word for it
Two ways to check it yourself:
- Turn off your network after the page has loaded, then use the tool. Almost all of them keep working — merging PDFs, converting images, formatting JSON — because nothing was going to be sent anyway.
- Open your browser's developer tools, go to the Network tab, and watch while you process a file. You will see the page's own scripts load, and after that nothing carrying your data leaves.
The exceptions below all show up in that Network tab, and theprivacy policy names every tool that makes a request:
- A font, fetched from this site. Building a PDF with Korean text embeds a real typeface; the file is served by MakerBox itself, not a third party, and your browser caches it for a year.
- The accurate background-removal model, if you pick it. The model itself comes from Hugging Face. If your browser can't run it on WebGPU, the WebAssembly code that runs it instead is fetched from the jsdelivr CDN. Both come from elsewhere to you; nothing of yours goes the other way.
- Map tiles. The 3D tiles viewer and the coordinate converter's map draw their tiles from OpenStreetMap, and the 3D viewer's satellite layer switches to Korea's VWorld. Nothing is fetched until you open the map.
- YouTube thumbnails. The thumbnail tool loads the image straight from YouTube's own servers.
- Online voices, if you turn them on. Text-to-speech uses the voices installed on your device by default. Switch on an online voice and the text you are converting is sent to that voice's provider — Google or Microsoft — to be spoken; the tool warns you before that happens.
- An address you give it. A few tools can open a document or picture from a web address you type, or show the pictures your Markdown or HTML links to. Your browser asks that address directly, and nothing of yours is added to the request.
- Advertising. The pages load Google's advertising script, a third-party script like any other; what it does is described on the privacy page.
Who makes this
MakerBox is made by one person, working under the handle shawn365 (the same name used on GitHub). There is no company and no team behind it, and no real name, country or resume published beyond that.
It started because the online tools already out there upload your file to a server before doing anything with it, and many free ones allow a few runs a day and then an hours-long wait.MakerBox uploads nothing and has no daily cap.
A few tools also stand on other people's work — models, fonts, a 3D engine, map data — andthe credits page names every one of them.
Why it is free
It is meant to be paid for by advertising. There is no premium tier, no account, no newsletter and no upsell.
Getting in touch
To report a bug, say which tool and, if a file broke it, what kind of file. Write toeogkr.kim@gmail.com, or use the contact page.