Merge and Join Videos
Add video clips in order, then click Join. All processing happens in your browser.
Add video clips
Drag and drop or click to browse. Add as many as you need.
About this tool
The Merge tool joins multiple video clips into a single file in the order you arrange them. It supports two modes: a fast lossless join for clips that already share the same codec and resolution, and a re-encode mode that handles any mix of formats.
Guide & tips
- Fast join is instant and lossless — it works by concatenating the bitstreams without any re-encoding. All clips must have the same codec (e.g. all H.264), resolution, and frame rate.
- Re-encode mode transcodes everything to H.264 MP4. Use this when your clips have different resolutions, frame rates, or formats.
- Add clips in the order you want them to appear. Use the up/down arrows or drag handles to reorder.
- Screen recordings, phone clips, and downloaded videos often have different codecs — use re-encode mode for these.
- After a fast join, use the Inspector to verify the output has a single continuous audio/video track.
Frequently asked questions
Fast join uses FFmpeg's concat demuxer to stitch clips together at the bitstream level. No decode or encode happens, so it is near-instant and completely lossless. Re-encode uses the concat filter, which fully decodes all clips and re-encodes them to a single H.264 MP4. It is slower but handles any mix of input formats.
This usually happens with fast join when clips have slightly different timebases, frame rates, or audio sample rates. Switch to re-encode mode to normalise everything to a consistent output.
There is no hard limit in the tool. The practical limit is your device's available RAM, since all clips are loaded into memory before processing.
Yes, but only in re-encode mode. Clips with different resolutions are scaled to match the first clip's dimensions. For best results, use the Crop or Convert tool to standardise all clips to the same resolution before merging.