Free Online Video Compressor for MP4, MOV & WebM

No. The selected file and compressed result remain in your browser. Only the FFmpeg WebAssembly engine is downloaded.

You can select MP4, WebM, MOV, WMV, MKV and AVI. The result is an MP4 for broad playback support.

The target is converted into a bitrate budget. Final size can vary slightly depending on the video content, audio and container overhead.

Choose H.264 for the widest compatibility. H.265 can produce smaller HD or 4K files, but older players may not support it.

Encoding runs through WebAssembly in your browser and is slower than native desktop FFmpeg. Duration, resolution and device speed all affect processing time.

Current WebAssembly memory addressing imposes a 2 GB hard input limit in ffmpeg.wasm.