Drop videos here
or browse to choose files
WMV · AVI · MOV · MKV · MP4 · WebM · FLV · M4V
⚙️ Output settings
Reasonable file size, good visual fidelity.
How does this work?
This page runs ffmpeg — the same powerhouse that powers VLC, OBS, and most professional encoding pipelines — compiled to WebAssembly so it executes entirely inside your browser tab.
When you drop a file, it's read into memory and handed straight to ffmpeg. No upload, no server, no telemetry. If you disconnect your internet after the engine has loaded, conversion still works.
The trade-off: because the conversion runs in your browser (single-threaded for compatibility with static hosts), it's slower than a cloud service for very large files. For short clips up to a few hundred MB it's usually fine. For 4K hour-long videos, a desktop ffmpeg install will be much faster.
The engine itself (about 30 MB) is downloaded on demand on first conversion and cached by your browser for the rest of the session.