How to use
- Choose split or join mode, then drag and drop your file (to split) or all the parts (to join) into the dropzone.
- For splitting, set the part size and pick MB or KB; for joining, make sure every numbered part is added.
- Click the button to split into numbered parts or to rejoin the parts back into one file.
- Download each part individually or use Download All, then later rejoin them to recover the original file.
Frequently asked questions
What file types can I split and join?
Any file type. The splitter works on the raw bytes of any file — ZIP archives, videos, disk images, PDFs, backups, installers or documents — so it does not matter what format or extension it is.
Are my files uploaded to a server?
No. Everything runs 100% in your browser using local file processing. Your files are never uploaded, so even large or sensitive files stay completely private on your device.
How large a file can I split?
There is no fixed limit set by the tool — it reads your file in slices, so it handles large files well. The practical ceiling depends on your device's available memory and the browser, especially when joining parts back together.
How do the parts get named and reassembled?
Split parts are named after the original file with a numeric suffix like name.001, name.002 and so on. When joining, the tool sorts the parts numerically by name and concatenates them in order, then strips the numeric suffix to restore the original filename.
Is the rejoined file identical to the original?
Yes. Joining concatenates the parts byte-for-byte in the correct order, so the reassembled file is an exact, lossless copy of the original with no quality loss or corruption.
Can I set the part size in KB or MB?
Yes. In split mode you enter a number and choose KB or MB as the unit. The tool cuts your file into fixed-size chunks of that size, with the final part holding whatever bytes remain.
About this tool
Free file splitter and joiner that runs 100% in your browser. Split any large file into smaller numbered parts by MB or KB, then rejoin them byte-for-byte — no uploads.