Merge Video Files

Upload multiple video files, drag to arrange their order, and merge them into one seamless video. Supports MP4, WebM, and MOV. All processing happens in your browser — nothing is uploaded to any server.

Upload Video Files

Click to browse or drag & drop multiple files here

MP4 WebM MOV AVI OGG

Clip Order

Mixed formats detected. Videos will be re-encoded to a common format. This may take longer but ensures compatibility.

Output Format

Resolution (if mixed sizes)

0 clips Total duration: 0:00 Total size: 0 MB

Processing...

Videos Merged Successfully!

How to Use

Upload Videos

Click or drag & drop multiple video clips at once.

Reorder Clips

Drag handles to set the playback order of your clips.

Set Options

Choose output format and resolution for mixed-size clips.

Merge & Download

Click Merge and download your combined video file.

Frequently Asked Questions

What video formats are supported?

MP4 (H.264/H.265), WebM (VP8/VP9), MOV, AVI, and OGG video. For best results, use MP4 files with H.264 encoding.

Do my videos need to be the same resolution?

No. If clips have different resolutions, select a target resolution in the options and all clips will be scaled to match before merging.

Are my files uploaded to a server?

No. All processing uses FFmpeg WebAssembly running entirely in your browser. Your files never leave your device.

Will video quality be reduced?

Videos are re-encoded to produce a single seamless output. A high-quality bitrate (CRF 23 for H.264) is used to minimize quality loss.

What if some clips have no audio?

FFmpeg will automatically add a silent audio track to clips without audio before merging, so the final output has consistent audio throughout.

How many clips can I merge?

There is no hard limit. However, total processing time depends on your computer speed and the combined file sizes. Large 4K files may take a few minutes.

✓ Done!