Merge AI Video Clips Into One Video

Yes. No account, no trial, no export cap and no watermark on the file you download. Merge as many sets as you like — the only real limit is how much memory your device has.

No. The files are read from your disk with the browser's File API and joined on your own machine with WebCodecs. If you want to check, open DevTools, switch to the Network tab and merge a few clips: you will not see a single request carrying your video.

When every clip has the same codec, resolution, frame rate and audio layout, the already-encoded frames can be copied straight into one MP4 with shifted timestamps. Nothing is decoded and nothing is encoded, so the picture is bit-for-bit identical to your sources and the merge takes seconds even for a long sequence. That is the normal case for a handful of clips out of the same AI model at the same settings. When the clips differ, they are decoded and re-encoded into a single track by your device's hardware encoder — fast, but lossy like any re-encode. The tool tells you which of the two it is doing, and why, before you press the button.

MP4, MOV, WebM, MKV and AVI, as long as your browser can decode what is inside — that covers H.264, HEVC on most Macs, VP9 and AV1. The output is always an MP4: on the fast path it keeps your clips' original codec, and on the re-encode path it is H.264 with AAC audio, which is the pair that plays everywhere.

Between 2 and 20 clips, up to 500 MB each and 2 GB in total. The merged file is assembled in memory before you download it, so the real ceiling is your device: on a laptop with plenty of RAM a 1 GB queue is fine, on an older phone it may not be. It does work on phones — recent iOS and Android Chrome both ship WebCodecs — but keep the clips short there and keep the tab in the foreground while it runs.

Never. A clip that does not match the output canvas is contained inside it at its own aspect ratio, with black bars or a blurred fill behind it — your choice. A clip with a different frame rate is resampled onto the output's frame grid rather than allowed to drift. Mismatched clips are flagged in the list before you merge, so you can drop the odd one out or switch the output size instead of finding out afterwards.

Clips chained with an image-to-video model usually start on the exact frame the previous clip ended on, because that frame was the prompt. Joined as-is, each cut plays the same picture twice, which reads as a tiny stutter — the thing people describe as "my merged AI video feels jerky". Removing 1 or 2 frames from the start of every clip after the first deletes the duplicate and the cut becomes invisible. Leave it off for clips that were not chained, or you will shorten them for nothing.

No, and deliberately so. This tool does hard cuts only: adding a crossfade would force a re-encode even on clips that could have been joined losslessly, which is the opposite of what it is for. Audio is carried through as it is, and clips with no sound get real silence of exactly their own length so everything after them stays in sync — dropping the gap instead is the usual reason a merged file goes out of sync.