Combine videos into one
Put your clips together into a single video you can share, without uploading them anywhere.
- Nothing is uploaded
- Works offline after first visit
- Open source
- No watermark · limit is your device’s memory; phones hold less
Combine several video clips into one MP4 in your browser. Phone clips, screen recordings, MOV or WebM. It is free, needs no account and adds no watermark, and your files are not uploaded: everything runs in your browser on your device. The size limit is your device’s memory, and phones hold less; give the page a short while after one visit to save itself for offline use, and then it works offline.
Done
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 holiday filmed in ten short clips, a recording that stopped halfway, a set of screen captures for one tutorial: combining them gives you one file to send or post.
Drop the clips, put them in order with the arrows, and press Merge. Each clip keeps its sound. Clips can come from different phones or apps; the first one sets the size and the rest are fitted inside it.
Your videos are not uploaded to a website, there is no watermark, and the page keeps working offline after one visit and a short wait.
How it works
- Drop two or more clips.
- Put them in order with the arrows.
- Press Merge videos and save the MP4.
In your browser, not on a server
Mediabunny (MPL-2.0) reads each MP4, MOV, WebM or MKV clip in your tab. Your browser decodes the frames (WebCodecs), draws them one clip after another onto a picture the size of the first clip, and encodes the whole once into an MP4, H.264 where available and VP9 or AV1 otherwise. Each clip’s sound is decoded by your browser and laid end to end to match.
Compared with upload-based tools: Online video mergers upload every clip before they start, cap free files at a few hundred megabytes, and often stamp a watermark on the result. Here the clips never leave your device.
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
Can I combine a portrait and a landscape video?
Yes. The result uses the shape of the first clip and the other is shown whole with black bars. For a cleaner look, crop the clips to the same shape first with Crop video.
Is the file uploaded anywhere?
No. There is no server in this process. The page is a static file and the work is done by code running inside your browser tab. Give the page a short while after one visit to save itself for offline use; then you can turn off Wi-Fi and it still works.
More video and audio tools
Merge videos
Combine clips into a single video, in the order you choose. Done on this device, never uploaded.
Vocal remover
Split a song into the music and the voice with an AI model running in this tab. Karaoke tracks and acapellas without uploading anything.
Video background remover
The person stays, the room goes: blurred, a flat colour or a picture of your choice, done frame by frame on your own device.
Audio splitter
Cut one long recording into separate files at the times you choose or at equal lengths. Done on this device, and the file is not uploaded.
Other conversions
Guides
- How to combine or merge videos into one on any deviceMost camera rolls can play clips one after another, not merge them into a single file. Here is what actually joins them.