BuzzKit
Video Merger
Pick two or more clips and join them, in order, into a single video.
Files merge in the order you selected them.
Merging re-encodes every clip to a common stream so they line up cleanly, so it can take longer than a straight conversion.
How the video merger works
Each clip is decoded and concatenated with ffmpeg's concat filter, then re-encoded together so mismatched resolutions or frame rates don't break the join.
Select clips in order
Choose two or more files — the order you pick them is the order they'll play.
Merge
ffmpeg concatenates and re-encodes them into one stream.
Download
Get back a single MP4.
When to use the video merger
A video merger is useful whenever footage ends up in separate files: clips from several takes, screen recordings captured in parts, or short phone videos you want to share as one piece. Pick the files in the order they should play, and the finished MP4 follows that same order.
For the cleanest result, merge clips that share a similar resolution and frame rate. Mismatched clips still join, because everything is re-encoded together, but they take longer to process. If a clip has extra footage at the start or end, cut it first with the Video Trimmer, then merge. Once the clips are joined, you can shrink the result with the Video Compressor if the file is too large to send.
Frequently asked questions
Do the clips need to match resolution?
No, but matching resolution and frame rate gives the cleanest result.
Is there a limit to how many clips?
No hard limit, but more clips means more processing time.
Can I reorder after selecting?
Re-select the files in your preferred order to change the sequence.
Are my videos uploaded anywhere?
No. The clips are joined in your browser tab using ffmpeg compiled to WebAssembly, so your footage stays on your device.
What format is the merged video?
A single MP4 file, regardless of the formats of the clips you select.