Compress Video
Smaller MP4s, MP3 from video, formats converted — locally.
Runs in your browserRelated
About
Compress Video re-encodes a video at a smaller resolution and quality (Small and Balanced presets, or full manual control), extracts its audio track as MP3, M4A, or WAV, or converts between MP4, WebM, MOV, MKV, and AVI — all using an in-browser FFmpeg engine, so the file never leaves your device. A trim range applies to every mode, and conversion tries a fast lossless stream copy before falling back to a full re-encode when the source and target codecs don't match. The engine is shared with Video to GIF, so if you've used that tool already, this one starts instantly.
Frequently asked
- How much smaller does it make a video?
- It depends on the source, but the Small preset (720p, CRF 30) typically cuts file size significantly for casual sharing; Balanced (1080p, CRF 26) keeps more detail at a more modest reduction.
- Can I just pull the audio out as an MP3?
- Yes, the Extract Audio tab exports MP3, M4A, or WAV without re-encoding the video at all.
- Is my video uploaded anywhere?
- No — an in-browser WebAssembly build of FFmpeg does all the work on-device. The video file is never sent to a server.