Merge Videos
Merge videos online for free — join several MP4, MOV and WebM clips into one MP4, in the order you choose. Clips with different sizes are fitted automatically, and the audio of each clip is kept in sync. Runs privately in your browser with no upload and no watermark.
100% private — everything is made on your device, never uploaded. Conversion happens on your device; nothing is uploaded.
Videos with a different shape are fitted with black bars. Use the arrows to change the order.
Videos are made by your browser with its built-in encoders (WebCodecs) and the open-source Mediabunny library — your photos, videos and music are never uploaded. Works best in recent Chrome, Edge and Safari.
How to merge videos
- Drop your video clips in the box.
- Use the arrows to put them in order.
- Choose the output size (or keep the first video's size).
- Click Merge videos, preview and download the MP4.
What you can use it for
- Join phone clips from the same day or trip
- Combine an intro, main video and outro
- Stitch screen recordings or lessons into one file
- Put several short clips together for social media
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See all free image tools →Frequently asked questions
How do I combine videos into one?
Add the clips, arrange them with the arrows, and click Merge videos.
Can I merge videos with different sizes or orientations?
Yes. Each clip is scaled to fit the output size, with black bars where the shapes differ.
What if a clip has no sound?
It stays silent in the merged video, and the other clips' audio stays in sync.
Is my video uploaded?
No. The video is read and encoded by your own browser using its built-in video encoders, so it never leaves your device — even large or private videos stay private.
Is there a file size limit?
There's no upload limit. The finished video is held in memory before download, so files up to a few GB work on most computers; very large files need more RAM.
Which browsers work?
Recent Chrome, Edge and Safari work best (they have hardware video encoders). Firefox 130+ works for most files.