MP4 to WebM Converter
Convert MP4 to WebM for HTML5 web embedding. 20-30% smaller, open-source, royalty-free. Free.
Initializing... drag & drop files here
Supports: MP4, M4V
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 MP4 to WebM Online
- Upload Your MP4 File: Click "+ Add Files" to select MP4 files from your computer, Google Drive, or Dropbox. Also accepts M4V files.
- Adjust Settings (Optional): Choose quality in Advanced Options.
- Convert and Download: Click "Convert" and download your WebM file.
Why Convert MP4 to WebM?
20-30% Smaller for Web
WebM with VP9 codec produces 20-30% smaller files than MP4 with H.264 at the same quality — ideal for reducing bandwidth on high-traffic websites.
HTML5 Web Embedding
WebM is the open-source format designed for <video> elements. Use with MP4 fallback for maximum compatibility:
<video>
<source src="video.webm" type="video/webm">
<source src="video.mp4" type="video/mp4">
</video>
Royalty-Free
WebM is completely royalty-free (developed by Google). No licensing concerns for commercial web use.
Frequently Asked Questions
Does Safari support WebM?
Safari 14.1+ supports WebM. Provide MP4 fallback for older Safari.
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.