Merge videos
Joins clips end to end in the order you choose them, normalising each one to a single frame size first so nothing is stretched or letterboxed unevenly.
- Choose two or more video files from your device.
- Pick the output shape: vertical, horizontal or square.
- Click merge, then download the joined MP4.
Clips are joined in the order shown and padded to the chosen shape, so nothing is stretched. Maximum 100 MB per file. Nothing is uploaded - merging runs on your device.
Frequently asked
Do the clips have to be the same size?
No. Each clip is scaled to fit the output shape you pick and padded rather than stretched, so mixed portrait and landscape footage joins cleanly.
What if one clip has no sound?
The tool first tries to join video and audio together; if a clip has no audio track it automatically falls back to joining the video only.
How many clips can I join?
As many as your device can hold in memory, at up to 100 MB each. There is no account limit and no daily cap, because the work happens on your machine rather than our servers.
Koldflux assembles multi-scene videos from one source recording automatically - no manual joining.
Automate this in Koldflux