Combine two or more video clips into a single file. Clips from the same source are joined instantly with stream copy; mixed sources are re-encoded to one MP4 — all on your device via FFmpeg WebAssembly.
How to use Video Joiner (Merge Clips)
Add two or more clips and arrange them in the order you want.
Keep fast mode for clips from the same camera/app, or enable Re-encode for clips with different formats or resolutions.
Click Join videos, preview the result, and download it.
Frequently asked questions
Are my videos uploaded to a server?
No — joining happens entirely in your browser via FFmpeg WebAssembly.
When do I need the Re-encode option?
Fast mode copies the streams, which only works when every clip shares the same codec, resolution, and frame rate. If your clips come from different sources, enable Re-encode — everything is scaled to the first clip’s size and merged into one MP4.
How long does joining take?
Fast mode finishes in seconds regardless of length. Re-encoding is slower since each frame is rebuilt — best for short clips.