Subscription tier limits
Up to 953.7 MB
Batch: 1 file
Up to 9.31 GB
Batch: 5 files
Up to 93.13 GB (streamed)
Batch: 50 files
Pro + Media streams output directly to disk via the File System Access API — no upper file-size limit, no RAM ceiling.
Add your clips in playback order
JAD picks stream-copy if codecs match, re-encode otherwise
Download the merged video
0 bytes uploaded. Video Merger runs entirely in your browser using WebCodecs, WebGPU, and FFmpeg.wasm. Pro + Media uses chunked streaming via the File System Access API — your video is never buffered to RAM in full and never leaves your machine.
Only when they differ in codec, resolution, or framerate. Identical clips use ffmpeg concat demuxer for lossless stitching.
Free 1, Pro 5, Pro + Media unlimited (streamed). The 4K-clip merge benchmark in our docs joins 25 clips totalling 18 GB without exhausting RAM.
Cut MP4, MOV, MKV, and WebM files without quality loss. Stream-copy mode keeps original codec, original quality, and finishes in seconds.
Open toolConvert between MP4, MOV, MKV, WebM, AVI, M4V, TS, and ProRes locally. Hardware-accelerated H.264/H.265/AV1 when available.
Open tool