Split a video into parts
Cut one video into parts at the times you choose, every so often or into equal pieces, and save them in one zip. Done on this device, and the video is not uploaded.
- Nothing is uploaded
- Works offline after first visit
- Open source
- No watermark. The limit is your device’s memory (phones hold less): a long or large video may need a computer.
Lets you cut one video into parts, either at the times you type, every so many seconds or minutes, or into equal pieces, and saves the parts in one zip. It is free, needs no account and adds no watermark, and your video is not uploaded: your browser reads the MP4, MOV, WebM or MKV and cuts it inside this tab. By default the cuts copy the video without re-encoding, so they take seconds; an option makes every cut exact on the frame. The size limit is your device’s memory, and phones hold less; after one visit and a short wait the page works offline.
Done
Free, no ads. Support StayPut
Open the network tab. Your files never appear in it.
Add files and run the tool to see every request this tab makes.
Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.
A worked example
You have lecture.mp4, a 90-minute recording, and want it in three sittings. Choose Into equal parts and type 3: you get lecture-part-01 to lecture-part-03, each 30 minutes. Or choose At times I type and type 25:00, 52:30 to cut where the topics change.
Every part starts where the one before it ended, so together they cover the whole video. The default cut copies the video as it is, which is why a long file splits in seconds and looks exactly like the original.
What this page does and does not do
- It cuts one video into parts, end to end. To keep just one stretch, Trim video (also at Cut video and Trim MP4) is the simpler page, and Combine videos joins parts back into one.
- It splits where you say. It does not find scene changes or chapters on its own.
- Want two videos on one screen? Use Side by side video.
- It makes up to 50 parts in one run, and each part keeps the video’s own format: an MP4 gives MP4 parts, a MOV gives MOV parts, and WebM and MKV stay WebM and MKV.
How it works
- Drop a video (MP4, MOV, WebM or MKV), or tap to pick one.
- Choose how to split: type the times where each new part should start, give a length such as every 30 seconds, or pick a number of equal parts. The page lists the parts and the total size before it starts.
- Press Split video. The parts are saved as name-part-01.mp4 and so on, and Download all gives you them in one zip.
In your browser, not on a server
Mediabunny (MPL-2.0) reads the MP4, MOV, WebM or MKV container in your tab to find its length, and the parts are planned in seconds so that each one ends where the next begins. Each part is then cut on its own: the video and sound packets between its two points are copied into a new file of the same type, starting from the nearest key frame, or, with exact cuts, decoded and re-encoded by your browser’s own video encoder (WebCodecs). The parts are packed into a zip by code in the page.
Compared with upload-based tools: Online video splitters upload the whole file, cap free videos at a few hundred megabytes and often add a watermark. Here nothing is uploaded, and a long video splits in seconds because the video is copied rather than re-encoded.
Verify it yourself. Give the page a short while after one visit to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.
Questions
How do I split a video into parts?
Drop the video, choose a way to split (times you type, every so many seconds or minutes, or a number of equal parts) and press Split video. The parts are separate files, and Download all gives you them as one zip.
Why does a part start a little early?
A video is stored as key frames with changes in between, and a cut that copies the video without re-encoding can only start on a key frame. So each part begins at the key frame just before the time you asked for, often within a second or two. The end of the part before it moves with it, so nothing is lost or repeated. Tick Exact cuts if a part must start on the frame.
Why are exact cuts slower?
To start between two key frames, the page has to decode the video and encode it again with your browser’s own video encoder, which takes about as long as playing the video through, and the result is close to the original but not identical. The default copies the packets instead, which takes seconds.
How many parts can it make?
Up to 50 in one run. If your times or length would make more, the page says so; use fewer times or a longer length, or split a part again.
How big a video can I split?
The size limit is your device’s memory, and phones hold less than computers: the parts are kept in memory until you save them, so about as much memory as the video is needed. A large video on a phone may fail; a computer will usually manage, or cut the video down first with Trim video.
What format are the parts?
The same as the video you dropped: an MP4 gives MP4 parts, a MOV gives MOV parts, and WebM and MKV stay WebM and MKV. They are named like holiday-part-01.mp4.
Can I split a video without uploading it?
Yes. The video is not uploaded: your browser reads the file from your device, cuts it with code running in this tab and zips the parts there. Open the network tab, run a split, and your video is not among the requests.
More video and audio tools
Mute video
Take the sound out of a video, in seconds and without re-encoding. The video never leaves this device.
Resize video
Change a video’s resolution, from 4K down to 240p or to a width and height you choose. Resized on this device, never uploaded.
Rotate video
Turn a sideways or upside-down video the right way up, or mirror it. Done on this device, never uploaded.
Crop video
Cut away the edges of a video, or crop it to vertical or square for social media. Cropped on this device, never uploaded.