Compress Video Files Online
Reduce video file sizes while keeping your footage looking great. Perfect for sharing, uploading, and saving storage space.
Drop a video file here or click to browse
Supports MP4, MOV, and WebM
Compress MP4, MOV, and WebM videos
Three compression levels to choose from
100% client-side — files never leave your device
Powered by FFmpeg WASM technology
Instant download of compressed videos
No watermarks, no sign-up required
Frequently Asked Questions
How much can I reduce my video file size?
Compression results depend on your video's content, resolution, and existing encoding. You can typically expect 30–70% size reduction. Videos with lots of static scenes compress more than action-heavy footage.
What's the difference between compression levels?
Low compression (CRF 23) preserves near-original quality with modest size reduction. Medium (CRF 28) offers a good balance between quality and file size. High compression (CRF 35) maximizes size reduction but may noticeably reduce visual quality.
Will compression affect my video's quality?
All lossy video compression involves some quality trade-off. Low compression is virtually indistinguishable from the original. Medium compression is suitable for most sharing purposes. High compression is best when file size is the priority.
Is it safe to compress videos with Compresso?
Absolutely. Compresso processes everything in your browser using FFmpeg WASM — your videos are never uploaded to any server. Your files stay completely private on your device.
What video formats are supported?
Compresso accepts MP4, MOV (QuickTime), and WebM input files. All compressed output is in MP4 format with H.264 encoding, which is universally compatible across devices and platforms.
Why does video compression take longer than image compression?
Video files contain thousands of frames that must each be re-encoded. FFmpeg WASM runs entirely in your browser, which is slower than native applications. Larger videos and higher resolutions take longer to process.