Merge videos into one
Put several clips end to end in one file. Drag them into the order you want and download the result.
- Free
- Runs on your device
- No account
- No limits
Two or more files. They're joined on your own device, so nothing is uploaded and there's no size limit beyond what your browser can hold.
How to merge videos into one
- Drop two or more videos in the box above. MP4, MOV, WebM, MKV and AVI all work.
- Put them in the order you want them played. The first clip decides the size and shape of the result.
- Download. The file is named after the first clip, with -merged added.
- The first video also fetches the video engine, about 7MB, which your browser then keeps. After that it starts straight away.
About merging video here
Clips that already agree about everything are joined without being decoded at all. Two exports from the same phone, or two halves of one recording, are copied straight into a new file, so a join of any length is over in about a second and every frame is bit for bit the one you started with.
Clips from different sources rarely agree, and then there's no way round rebuilding them. Each one is fitted to the frame of the first clip, letterboxed rather than stretched so nothing comes back squashed, and the whole thing is encoded once. That takes roughly as long as the videos run. Both paths are tried in that order, so you get the fast one whenever it's available without having to know which case you're in.
Sound is handled the way you'd want rather than the way that's easiest. If one clip is silent and the others aren't, the silent one gets a silent track of its own length instead of the sound being dropped from all of them. A quiet title card in front of a clip you want to hear is the usual version of this, and losing the audio would lose the point.
This edit changes the picture, so every frame has to be decoded and encoded again. Your own machine does that work, which is what keeps the file off anybody's server, and it's why a long clip takes longer than a short one. Trimming and removing the sound are the two things here that skip it entirely.
Common questions
Is the merge videos into one free?
Yes, properly free. No paid tier, no trial, no watermark on the result and nothing to sign up for. Put as many files through it as you like, as often as you like.
Are my files uploaded to a server?
No. The merge videos into one runs inside your browser, on your own machine, so your files never go anywhere. Big ones are fine too, up to whatever your browser can hold.
Can I merge videos with different sizes or formats?
Yes. Anything that doesn't match the first clip is scaled to fit its frame and padded with black rather than stretched, so a vertical phone clip dropped in beside a widescreen one keeps its proportions instead of being squashed across. Mixing formats means the result has to be rebuilt rather than copied, so it takes longer than joining two clips that already match.
Why is merging sometimes instant and sometimes slow?
Because two clips that already share a codec, a resolution and a frame rate can be written into one file without being decoded, which takes about as long as copying the file. Clips that disagree about any of that have to be decoded, fitted to one frame and encoded again. This page tries the fast way first every time, so you never have to work out which case you have.