Video Converter — Convert Any Format, 100% Locally
MediaVault's universal video converter turns MOV, MKV, AVI, WebM, FLV, WMV and more into clean, shareable MP4 — or any other format you need. Unlike typical online video converters, your file never leaves your computer.
How it works: FFmpeg in your browser
The converter runs FFmpeg compiled to WebAssembly inside your browser tab. Your video is decoded and re-encoded in local memory using your own CPU. There is no upload step, no queue, and no server-side copy of your footage to worry about.
Why choose a local converter over a cloud one?
- Privacy. Client work, interviews and personal footage stay on your device.
- No watermarks. Output is exactly what FFmpeg produces — nothing branded on top.
- No upload wait. A 2GB file doesn't need a 2GB upload first.
- No arbitrary size caps. Your machine's memory is the only limit.
Supported conversions
- MOV → MP4 (iPhone / QuickTime footage for any platform)
- MKV → MP4 (broad player and social compatibility)
- AVI / WMV / FLV → MP4 (modernise legacy archives)
- MP4 → WebM (smaller, web-optimised delivery)
- Video → MP3 / WAV audio-only extraction
Convert a video in three steps
- Open the MediaVault Universal Converter and drop in your file.
- Pick the output format and quality preset.
- Click Convert & Download — the result saves straight to disk.
Frequently asked
Is it really free? The free tier covers 2 conversions a day, which handles occasional use. Pro removes the daily limit and adds higher-throughput batch work and advanced presets.
Does it work offline? After the first load, the conversion engine runs entirely on-device.