File Splitter & Joiner
Split any file into fixed-size or N chunks and rejoin them — 100% in your browser, no upload
Drop any file here, or click to choose
🔒 Splitting and joining happen entirely in your browser — your file is never uploaded. Parts are byte-exact, so joining them back gives you the original file bit-for-bit.
Split any file into parts, then join them back
Drop a file and split it into fixed-size chunks (say 10 MB each) or into a set number of equal parts. Each chunk downloads as a numbered .partNN file. To reassemble, switch to Join mode, drop all the parts, and download the original file — the pieces are byte-exact, so the rejoined file is identical to the original bit-for-bit.
Why split a file?
Get around email or upload size limits, fit a large file across several USB sticks or cloud slots, or move data in smaller, resumable pieces. Unlike a PDF page splitter, this works on any file type — video, archives, disk images, anything — in the style of 7-Zip volumes.
Frequently asked questions
How do I join the parts back together?
Switch to Join mode and drop all the .partNN files at once. They are automatically sorted by part number and merged into the original file, which downloads under its original name.
Is my file uploaded to a server?
No. Splitting and joining run entirely in your browser using the File API, so your file never leaves your device.
Will the rejoined file be identical to the original?
Yes. The split is a plain byte copy with no compression or re-encoding, so joining the parts back produces a file that is bit-for-bit identical to the original.