Merge videos online free — combine multiple MP4, WebM or MOV clips into one file. FFmpeg browser-based processing, no server upload.
Video Merger is a free online tool that joins multiple video files into one seamless clip. Drag to reorder clips in the timeline, and videos with different resolutions are unified automatically for a smooth, gap-free result. It supports MP4, WebM and MOV and exports a widely compatible MP4. All processing runs in your browser, so no video is ever uploaded to a server.
merge
Drag & drop videos or click to select (multiple)
lock Your files never leave your device
How to use Video Merger?
Upload the video files you want to merge all at once or one by one.
Check the clip order in the timeline and drag to rearrange them.
Trim any unnecessary parts from each clip if needed.
Choose the output resolution and format.
Click merge and download the combined video.
Frequently asked questions about Video Merger
Can I merge videos with different resolutions?
Yes, resolutions are automatically adjusted. For best results, use videos with the same resolution.
Is the quality of the merged video preserved?
When the clips share the same resolution and codec, they are joined seamlessly with no quality loss. If resolutions differ, the video is re-encoded to unify them, which may introduce a slight change.
Is there a limit on the number of videos or file size I can merge?
There is no fixed limit on the count, but since everything is processed on your device, the total size and length depend on your device's memory and performance. For several large 4K clips, a desktop gives the most stable results.
Are my uploaded videos stored on a server?
No. All merging happens entirely inside your browser, so no video is ever uploaded to or stored on a server. Once you are done, the result stays only on your device.
Which video formats can I merge, and what format is the output?
Common formats such as MP4, WebM and MOV are supported, and the result is exported as MP4 (H.264) for the widest compatibility. Whenever possible, merging clips of the same format and codec is fastest and cleanest.
How to get the most out of Video Merger?
Merging videos with the same resolution and codec gives the cleanest result with no re-encoding.
Trim unnecessary parts from each video before merging for a more efficient workflow.
Multiple short clips merge faster than long videos in browser-based processing.
When mixing portrait and landscape clips, resize them to the same aspect ratio first to reduce black bars.