Merge Videos Online Free

Frequently asked questions

How do I merge videos online?

Upload two or more MP4 videos. They appear in a list. Use the up/down buttons to reorder. Remove any clip you do not want. Click "Merge videos". FFmpeg.wasm concatenates them in order in your browser. Download the single MP4. Your files never leave your device.

Are my videos sent to a server?

No. Merging runs entirely in your browser using FFmpeg.wasm. Your videos never leave your device.

Do all videos need the same resolution or codec?

The tool uses re-encoding (filter_complex concat) so different resolutions and codecs are supported. All clips are merged in sequence into one MP4.

Can a video have no audio?

The merge expects every input to have both video and audio. If one file has no audio track, the merge may fail. Use videos that all have an audio stream.

Why does FFmpeg take a few seconds to load?

FFmpeg.wasm is a large WebAssembly module. It is downloaded once and cached. The first time you use the tool you will see a short loading state.

Does it work on mobile?

Yes, in browsers that support WebAssembly. Merging several or long clips may take a while on phones.

Is there a limit on how many videos I can merge?

There is no fixed limit. Very many or very long videos may use a lot of memory and take a long time. For typical use (e.g. under 10 clips), the tool works well.

What format is the output?

The output is a single MP4 (H.264 video, AAC audio) containing all clips in the order you set.

Can I change the order after uploading?

Yes. Use the up and down arrows next to each clip to reorder. The merged video will follow the order shown in the list.

Does it work in all browsers?

FFmpeg.wasm requires a modern browser with WebAssembly. Chrome, Firefox, Safari, and Edge (recent versions) work.