Compress MP4 Video

MP4 is the world's most common video format, but file sizes vary wildly depending on how the video was encoded. A 5-minute MP4 can be anywhere from 30MB to 2GB depending on resolution, bitrate, and codec settings. High-bitrate MP4 files from cameras, screen recorders, and video editors are often far larger than they need to be for sharing, streaming, or storage.

Coda One's Video Compressor re-encodes MP4 files using H.264 with optimized settings, typically reducing file size by 40-80% with minimal visible quality loss. The compression uses FFmpeg WebAssembly running entirely in your browser -- your video is never uploaded anywhere. This is real re-encoding, not just metadata stripping, so you get genuine size reduction.

The quality slider gives you direct control over the compression level. CRF (Constant Rate Factor) values range from 18 (very high quality, larger file) to 35 (lower quality, smaller file). For many uses, the default Medium setting (CRF 28) is a practical balance -- noticeably smaller files with quality that still looks solid on common screens. For archival or professional use, try High quality (CRF 20-23).

The output is always MP4 with H.264 video and AAC audio, plus the faststart flag for instant web playback. This means compressed files work everywhere -- phones, browsers, media players, social platforms, and messaging apps all handle the output natively.