Convert Video

Convert between MP4, WebM, and MKV video formats directly in your browser with hardware acceleration.

Drop video or audio files here or browse your device

Files are processed locally inside browser memory. No uploads.

.mp4 · .webm · .mkv · .mov · .avi•As many files as your device can handle

Privacy-firstNo uploadsProcessed locallyWebCodecs & GPU acceleration active

Frequently Asked Questions

Are my video or audio files ever uploaded?

No. LocalVideoKit processes all media files directly in your web browser using HTML5 File APIs, WebCodecs, and WebAssembly. Your files are never sent to any server or cloud service.

What is the difference between remuxing and transcoding?

Remuxing changes the container (e.g. MKV to MP4) without modifying the compressed video stream, which takes seconds with zero quality loss. Transcoding decodes and re-encodes frames, which takes longer.

How this tool works

Convert MP4, WebM, MKV, and MOV videos locally without server uploads. 100% private.