File Splitter & Joiner

Break a file that is too big to send into smaller numbered parts, then rejoin those parts back into the exact original later. A simple way around email and upload size limits.

Read the guide: How to Split & Rejoin Large Files
File Splitter & Joiner

Drop a file here, or click to browse

Everything stays on your device — nothing is uploaded.

How it works

  1. 1

    To split: add a file

    Drop in the large file and choose a part size, such as 10 MB each.

  2. 2

    Download the parts

    Get numbered pieces you can send or upload one at a time.

  3. 3

    To join: add the parts

    Later, drop all the parts back in and the original file is rebuilt, byte for byte.

Instant & 100% private — nothing is uploaded

Everything runs locally in your browser. Your files are processed on your own device and are never sent to a server, so there are no upload waits, no size limits from us, and nothing is ever stored or logged.

Frequently asked questions

Is the rejoined file identical to the original?
Yes. Splitting only cuts the file into pieces and joining stitches them back in order, so the rebuilt file is byte-for-byte the same as what you started with.
Why would I split a file?
To get past size limits. Email attachments, chat apps and some upload forms cap how large a single file can be, so splitting lets you send a big file as several smaller parts.
Do I need this exact tool to rejoin the parts?
Use the join mode here to rebuild the file reliably. Keep all the numbered parts together, since every piece is needed to restore the original.
Is my file sent to a server?
No. Everything runs locally in your browser. Your file is read and processed on your own device, nothing is uploaded, and nothing is logged or stored.