Video Merger
Join multiple video files into one - completely offline
Drop your videos here
or click to select multiple video files
Merge Settings
Merged Video
Why Use Our Video Merger?
Combine Clips
Merge any number of video clips into a single continuous video.
Re-encode for Compatibility
All clips are re-encoded to H.264 MP4 for seamless joining.
No Upload Needed
All processing happens in your browser. Your videos stay private.
Technical Details
- Each clip is first re-encoded to H.264 video and AAC audio (44.1 kHz) at the quality you choose: CRF 18 (high), 23 (medium) or 28 (low), so clips from different cameras and apps end up with the same codecs.
- Every clip is scaled to the first clip's frame size and frame rate; clips with a different shape are letterboxed rather than stretched, and clips without sound get a silent audio track so they join cleanly.
- The re-encoded clips are then joined end to end, in the order you added them, without a second re-encode.
- The result is a single MP4 file that plays on phones, in browsers and in video editors.
- All of this runs in ffmpeg compiled to WebAssembly inside your browser tab. Long or 4K clips need plenty of free memory, and encoding speed depends on your computer.
Frequently Asked Questions
Do all videos need the same resolution?
No. Every clip is resized to the first clip's frame size and frame rate before joining. Clips with a different shape (for example a vertical phone video after a landscape one) get black bars instead of being stretched.
How many videos can I merge?
You can merge as many videos as needed, up to browser memory limits.
What format is the merged output?
All videos are re-encoded to MP4 (H.264/AAC) for universal compatibility.
Can I merge a video that has no sound?
Yes. A silent audio track is added to that clip so it can be joined with clips that do have sound.
In what order are the videos joined?
In the order you add them. To change the order, remove a clip and add it again at the right point.
Why does merging take a while?
Every clip is re-encoded on your own processor rather than on a server farm. Shorter, lower-resolution clips and the low-quality setting finish fastest.