Video Converter
Convert between MP4, WebM, MOV and AVI, entirely in your browser via ffmpeg.wasm.
MP4, WebM, MOV, and AVI each dominate a different ecosystem - MP4 for general playback, MOV for Apple editing tools, AVI for older Windows software, WebM for the web. This tool converts between all four using FFmpeg compiled to WebAssembly, running the full re-encode locally in your browser with nothing uploaded. It's the general-purpose format swap for video; for a dedicated MP4-to-web-optimized path, MP4 to WebM handles that specific conversion with VP9/Opus encoding.
Loading tool
How it works
- 01
Drop or select your MP4, WebM, MOV, or AVI file.
- 02
Choose the target format.
- 03
Click Convert and download the result.
Details
- Category
- Video
- Runs
- In your browser
- Files uploaded
- No
- Cost per run
- Free
- Sign-in
- Not required
- Works offline
- Yes, once loaded
Last updated 2026-08-03
Common questions
Which formats are supported?
MP4, WebM, MOV and AVI, both as source and target.
Does it upload my video?
No - conversion runs locally with WebAssembly. Nothing leaves your browser.
How long does conversion take?
It scales with clip length and resolution, since encoding runs in your browser tab rather than on a server GPU. Longer or higher-resolution videos take proportionally longer.
Which format should I choose for editing in Premiere or Final Cut?
MOV is the most broadly compatible choice for professional editing software, though modern MP4 (H.264) also imports cleanly into most editors.