Split a file
Numbered pieces small enough to send.
Drop files here
or click to choose from your device
One file per runUp to 150 MB per file5 runs per dayRemove limits with Pro✓ Works offline
Your files stay on your device
This tool runs entirely in your browser. Nothing is uploaded, nothing is stored, and you can even turn off your internet connection before you start.
Example
Example: a 48.6 MB school-play video emailed in three 17 MB pieces
A parent wants to email school-play.mp4, 48.6 MB, to the grandparents with Gmail. Gmail takes up to 25 MB a message once the attachment is encoded, so they choose 17 MB pieces, the largest that fit. Nothing is compressed: the video is only cut.
- 48.6 MB in 17 MB pieces makes 3: school-play.mp4.001 and .002 at 17.0 MB each, and .003 with the 14.6 MB left over. The page notes “3 parts” and how to put them back.
- Each piece goes in an email of its own.
- The grandparents save the three pieces in one folder and drop them on the join page in any order: the numbers at the end of the names set the order, and school-play.mp4 comes back byte for byte.
- Without this site: copy /b school-play.mp4.001+school-play.mp4.002+school-play.mp4.003 school-play.mp4 on Windows, or cat school-play.mp4.0* > school-play.mp4 on a Mac.
| Piece size | Pieces | Last piece |
|---|---|---|
| 50 MB | — | refused: 48.6 MB already fits in one piece |
| 20 MB | 3 | 8.6 MB |
| 17 MB | 3 | 14.6 MB |
| 10 MB | 5 | 8.6 MB |
| 5 MB | 10 | 3.6 MB |
| 1 MB | 49 | 0.6 MB |
Three emails of about 17 MB each, and pieces that add up to exactly 48.6 MB. Fewer, larger pieces suit someone who joins them on this site, because the joiner takes three pieces a run on the free plan; more pieces are joined with 7-Zip or copy /b.
How it works
- Add the file. Any file: a video, an archive, a disk image, anything.
- Choose how big each piece should be. For Gmail choose 17 MB: its 25 MB limit counts the attachment after email encoding, which adds about a third, so 25 MB pieces would not fit.
- Press split. You get file.001, file.002 and so on, in order.
- Send them all. Whoever receives them puts them back together with our join tool, or with 7-Zip or cat.
Frequently asked questions
- Does this compress the file?
- No. The bytes are cut where you asked and nothing else happens to them, so the pieces add up to exactly the original size. If you want it smaller, zip it first and split the zip.
- Can the pieces be put back together without this site?
- Yes, which is the point of the naming. On a Mac or Linux, `cat file.001 file.002 > file`. On Windows, `copy /b file.001+file.002 file`. 7-Zip and WinRAR also recognise the pattern.
- Is a piece on its own usable?
- No. Each piece is a slice of bytes from the middle of a file, not a file in its own right. They only mean anything joined back up, in order.
- How many pieces will I get?
- The file’s size divided by the piece size, rounded up; the last piece holds what is left. 58.6 MB in 20 MB pieces is 3 (20 + 20 + 18.6). A file that already fits in one piece is refused with a note to choose a smaller size, and one run makes at most 200 pieces.
- Can the person who gets the pieces join them here?
- Yes, on the Join split files page, in any order: the numbers in the names set the order, and a gap — .001 and .003 without .002 — is refused rather than joined into a damaged file. On the free plan the joiner takes three pieces a run; for more, 7-Zip or the copy /b and cat commands above have no such limit.
- Is my file uploaded, and how big can it be?
- No. The slicing happens in your browser, so the file never leaves your computer. The free plan takes one file of up to 150 MB per run and 5 runs a day; Pro removes both limits, and then your device’s memory is the ceiling.