Video to WebM Converter
Advanced Options - Our defaults are optimized for the best results. We recommend you keeping the defaults unless you have a specific need.
Reset to defaults
Need help?How to Convert Video to WebM Online
- Upload Your Video: Click "+ Add Files" to select a video file from your computer, Google Drive, or Dropbox. Supports MP4, MOV, AVI, MKV, WMV, FLV, MTS, MPG, and 30+ other formats.
- Adjust Settings (Optional): Choose quality and resolution in Advanced Options. Default produces a web-optimized VP9 WebM.
- Convert and Download: Click "Convert" and download your WebM file.
Why Convert to WebM?
HTML5 Web Embedding
WebM is the open-source format designed specifically for web use. It's the recommended format for HTML5 <video> elements, supported by Chrome, Firefox, Edge, Opera, and Safari 14.1+.
<video autoplay loop muted playsinline>
<source src="video.webm" type="video/webm">
<source src="video.mp4" type="video/mp4">
</video>
Smaller Files Than MP4
WebM with VP9 codec often produces 20-30% smaller files than MP4 with H.264 at the same visual quality — ideal for reducing bandwidth costs on high-traffic websites.
Open Source and Royalty-Free
WebM is developed by Google and is completely royalty-free. No licensing concerns for commercial web use.
Replace Heavy GIFs
Convert animated content to WebM instead of GIF for 90%+ file size reduction with better quality. Use <video autoplay loop muted> as a drop-in GIF replacement.
WebM vs MP4 for Web
| WebM (VP9) | MP4 (H.264) | |
|---|---|---|
| File size | 20-30% smaller | Baseline |
| Browser support | 97%+ (all modern) | 100% (universal) |
| Safari support | 14.1+ (2021) | All versions |
| License | Royalty-free | Requires license (free in practice) |
| Best for | Web embedding, bandwidth savings | Universal fallback |
Recommendation: Use WebM as primary with MP4 fallback via <source> elements for maximum compatibility and smallest files.
Frequently Asked Questions
What video formats can I convert to WebM?
Any format: MP4, MOV, AVI, MKV, WMV, FLV, MTS, MPG, 3GP, VOB, HEVC, and 30+ more.
Does Safari support WebM?
Safari 14.1+ (macOS Big Sur, iOS 14.5, and later) supports WebM. For older Safari, provide an MP4 fallback.
Can I convert multiple videos at once?
Yes. Upload multiple files and convert them all with the same settings.
Is it free?
Yes. Completely free with no watermarks, no sign-up required, and no file count limits.
Does it work on mobile?
Yes. Works in any modern browser on all devices — no app installation required.