Video Converter
Convert video between MP4, WebM, MOV, AVI, MKV, GIF and extract audio — free, no upload required.
Your computer does 100% of the processing — not a server, not the cloud.
FFmpeg — the industry-standard open-source video engine — runs directly inside your browser via WebAssembly. Your video file never leaves your device. It is not uploaded, transmitted, or processed anywhere outside your own machine.
- ✓Files stay on your computer — zero upload, zero cloud
- ✓Completely private — no account, no logging, no analytics on your files
- ✓Works offline once the engine has loaded
- ⚠Speed depends entirely on your device. Your CPU and RAM do all the work — a faster machine converts faster.
- ⚠Very large files (1 GB+) may be slow or use significant memory.
Drop a video file here or browse files
MP4 · WebM · MOV · AVI · MKV · WMV · FLV · M4V · and more
Recommended: under 500 MB for reasonable conversion times
Free Online Video Converter — 100% Local, No Upload, Runs on Your Computer
This converter runs FFmpeg — the industry-standard open-source video engine — compiled to WebAssembly inside your browser. Your video never leaves your device. All encoding is performed by your own CPU. This site has no servers involved in conversion at any point.
Supported output formats
Frequently asked
Why is it slow? Video transcoding is one of the most CPU-intensive tasks a computer can do. Because your device does all the work — not a cloud server — speed entirely depends on your processor.
What's the recommended file size? Under 500 MB for reasonable times. Files up to ~2 GB usually work but may take many minutes. Above 2 GB your browser may run out of memory.
Why does it download ~32 MB on first use? That's the FFmpeg WebAssembly engine. It downloads once and your browser caches it — future conversions start immediately with no download.
Is my video private? Completely. The video data is read from your disk into your browser's memory, processed by FFmpeg running in WebAssembly, and written back to your disk. It never touches a network connection or any external service.
Frequently Asked Questions
Is my video uploaded to a server?
No. Conversion runs locally in your browser using FFmpeg compiled to WebAssembly. Your video never leaves your device.
What formats are supported?
Input and output: MP4, WebM, MOV, AVI, MKV, and animated GIF. Audio extraction outputs MP3, AAC, OGG, and WAV.
Why does conversion take a while?
Video processing is CPU-intensive. Running it in the browser without a server means your device does all the work — conversion speed depends on your hardware.
Is there a file size limit?
No server limit, but very large files (1GB+) may exceed your browser's memory capacity.