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MP4 Compressor
Reduce MP4 video size in your browser. Free, no upload. Client-side only.
MP4 is the most common video format; compressing it reduces file size for sharing, email, or storage. Our tool outputs H.264 MP4 so the result plays everywhere. We never output a file larger than the original—if compression can't reduce size, we keep the original and tell you. All processing runs in your browser; your video never leaves your device.
When to use MP4 Compressor vs other formats
Compress MP4 when your file is too large for email, messaging, or upload limits. Use MP4 output when you need maximum compatibility (phones, browsers, social). For web-only use, WebM can sometimes give smaller size; for Apple-only workflows, MOV is an option. For most users, H.264 MP4 is the best balance of size and compatibility.
Compatibility
Compressed MP4 (H.264) plays on iPhones, Android, Windows, Mac, smart TVs, and all major browsers. YouTube, Instagram, and other platforms accept it. We use a safe quality curve so defaults don't over-compress; you can adjust target size as needed.
Quality considerations
We use CRF-based encoding and never exceed the original bitrate. High-bitrate sources (e.g. 20+ Mbps) can be reduced significantly; already compressed videos may show limited savings. Audio is encoded at 64 kbps for short clips and 96 kbps for longer ones to keep size down without hurting speech clarity.
Example use cases
- Shrink screen recordings or tutorials for email or Slack.
- Reduce phone or camera MP4 size for faster upload or backup.
- Prepare video for web or app embedding with a smaller file.
- Fit more videos on a USB or cloud storage by compressing MP4.
- Create smaller copies of event or meeting recordings for sharing.
Best practices
- Use a moderate target size or quality so the video stays sharp while shrinking file size.
- High-bitrate or high-resolution sources (e.g. 20+ Mbps, 4K) see the most size reduction.
- For email or messaging, choose a smaller target; for archiving or playback on large screens, use a higher target.
- All processing runs in your browser—your video never leaves your device.
- Output is always MP4 (H.264) for maximum compatibility with phones, browsers, and social platforms.
Common use cases
- Screen recordings & tutorials — Shrink screen recordings or tutorial videos for email, Slack, or documentation.
- Phone or camera footage — Reduce MP4 or MOV from phones and cameras for faster upload or backup.
- Web and app embedding — Prepare video for web or app embedding with a smaller file for faster loading.
- Storage and backup — Fit more videos on USB or cloud storage by compressing without losing playability.
- Social and sharing — Meet platform size limits or speed up sharing by reducing file size. Output plays everywhere.
Powered by browser video APIs and optimized processing algorithms.