Related Tools
WebM Compressor
Compress WebM videos in your browser. Output MP4 for broad compatibility. Free, client-side.
WebM is an efficient web format. Compressing WebM reduces file size for streaming or download while keeping the result in an open format. Our tool outputs H.264 MP4 for universal playback; if your source is WebM, we re-encode to MP4 so the compressed file plays everywhere, including Safari and iOS. Processing is client-side only.
When to use WebM Compressor vs other formats
Use our compressor when you have WebM and need a smaller file that plays on all devices—we output MP4. Keep WebM only if you're targeting browsers and Android and want to stay in VP9/WebM. For maximum compatibility and one output format, our MP4 output is the best choice.
Compatibility
The compressed output is MP4 (H.264), so it plays on every major platform. If you need WebM output specifically, you can convert the result with another tool. We never output a larger file than the original.
Quality considerations
Re-encoding WebM to MP4 uses the same smart bitrate and CRF logic as other sources. High-quality WebM can be compressed without visible loss at moderate targets. Use the target size slider to balance size and quality.
Example use cases
- Reduce browser-recorded or exported WebM for sharing as MP4.
- Shrink WebM game or screen captures for upload or storage.
- Create a smaller, universally playable MP4 from WebM sources.
- Compress WebM assets for web or app delivery.
- Reduce WebM file size for email or messaging by converting to smaller MP4.
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.