Split a video into parts without uploading it
The Split Video tool turns one long recording into several shorter files. Cut it into a number of equal parts, into clips of a fixed length, into pieces that stay under a file-size limit, or at split points you place yourself on the filmstrip. Every part is saved as its own MP4, MOV, WebM or MKV file, and you can download them one by one or all together as a ZIP.
It is useful for posting a long clip to apps that limit video length, emailing a recording that is too big for one attachment, breaking a lecture into chapters, or handing a long screen capture to an editor in manageable chunks. The video is processed in your browser with WebCodecs and the Mediabunny library (MPL-2.0) and never leaves your device.
How to use the Split Video
- Drop a video onto the box or click to choose one. Its length, resolution, codecs and keyframes appear above a filmstrip.
- Choose How to split: Equal parts, Every X seconds, By file size or At markers, and enter the number, length or size.
- For markers, move the playhead and press Add split point at playhead, then drag the points or type exact times.
- Pick Fast · lossless or Precise · re-encode and check the table of parts — start, end, length and estimated size.
- Press Split video. Preview any part, download it on its own, or press Download all as ZIP.
Split Video features
Four ways to split
Equal parts, a fixed length per part, a maximum file size per part, or your own split points — up to 100 parts.
Lossless by default
Fast mode copies the original packets into each part, so nothing is re-compressed and splitting takes seconds.
Real size planning
Size-based splitting adds up the actual bytes of every frame plus the audio bitrate, rather than guessing from the average.
Frame-accurate option
Precise mode re-encodes each part so it starts and ends on the exact frame, for parts that must be an exact length.
Parts that play everywhere
Every part starts on a keyframe with its own audio, so each file plays on its own in any player.
ZIP or one by one
Download a single ZIP (stored without recompression, so it is quick) or pick individual parts after previewing them.
Why split points move in fast mode
A video file is mostly made of frames that describe changes from earlier frames; only the occasional keyframe is a complete picture. A new file has to begin with a keyframe or the first moments will not decode. Fast mode therefore moves every split point to the nearest keyframe, and the white lines on the filmstrip and the table show where each part will really start and end. Two requested points that fall in the same keyframe interval become one, so you may get fewer parts than you asked for.
Phones usually record a keyframe every one or two seconds, so fast-mode parts are typically within a second of the requested length. If parts must be exact — for example 15.000 seconds each — switch to precise mode, which decodes and re-encodes so every part starts on the exact frame.
Choosing a split method
Length limits for stories and status updates differ between apps and change over time, so check the app’s current limit and enter it in “Every X seconds”.
| Method | Best for | How the last part behaves |
|---|---|---|
| Equal parts | Chapters of similar length, sharing work | All parts are about the same length |
| Every X seconds | Apps with a maximum clip length | Holds whatever is left, so it is shorter |
| By file size | Email and chat attachment limits | Holds whatever is left, so it is smaller |
| At markers | Scenes, songs or lecture topics | Ends where the video ends |
After splitting
- To remove an unwanted bit from one of the parts, open it in the Video Cutter or tidy its ends with Trim Video.
- Changed your mind? Merge Videos joins parts back together; parts split in fast mode join losslessly because they share the same settings.
- Size-limited parts can still be large in absolute terms. To make each part smaller rather than shorter, compress the video first with the Video Compressor.
Split Video FAQ
How do I split a video into equal parts?
Choose “Equal parts”, enter how many parts you want and press Split video. In fast mode each split moves to the nearest keyframe, so lengths can differ slightly; precise mode makes them equal to the frame.
Can I split a video by file size?
Yes. Choose “By file size” and enter the maximum size per part in MB. The tool adds up the real size of each frame and the audio, and starts a new part before the limit would be exceeded.
Does splitting a video reduce its quality?
Not in fast mode — the parts contain the original compressed packets, unchanged. Precise mode re-encodes and adds a small generation loss.
Why are there fewer parts than I asked for?
In fast mode, two split points that fall between the same pair of keyframes snap to the same keyframe and merge. Use precise mode, or choose longer parts.
Is there a limit on video length?
There is no fixed limit, but every part is built in your browser’s memory. Long 4K recordings can exceed the memory of phones; a desktop browser handles several gigabytes.
Is my video uploaded when I split it?
No. It is read directly from your device and split in the browser. Only the Mediabunny library (MPL-2.0) and, for ZIP downloads, JSZip (MIT) are fetched from public CDNs.