Convert MP4 videos to WebM format in your browser — no upload needed.
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Convert MP4 videos to WebM format for optimal web performance and open-source compatibility.
Upload your MP4 file, click Convert, and download the WebM output. Video is encoded with VP9 and audio with Opus.
Upload your MP4
Drop an .mp4 file onto the upload area.
Set quality
Choose a quality level. WebM with VP9 codec produces excellent quality at smaller file sizes than MP4.
Convert
Click "Convert to WebM". FFmpeg encodes the video using the VP9 codec.
Download
Save the WebM file. It is ideal for embedding in web pages and HTML5 video tags.
Web Page Video Embeds
WebM loads faster than MP4 in Chrome and Firefox — convert for HTML5 video tags on your website.
Core Web Vitals
Replace MP4 with WebM on landing pages for smaller file sizes that improve LCP and page speed scores.
Open Source Projects
WebM uses royalty-free codecs — ideal for open-source projects, documentation, and GitHub demos.
Browser-Based Apps
Web applications and PWAs benefit from WebM's native browser support without extra codec installations.
E-Commerce Product Videos
Convert MP4 product videos to WebM for faster-loading product pages and better mobile performance.
Blog & Tutorial Embeds
Embed WebM videos in blog posts for faster load times than equivalent MP4 files.
VP9 + Opus Encoding
Output uses VP9 video and Opus audio — delivering excellent quality at 30–50% smaller sizes than H.264 MP4.
All Modern Browsers
WebM is natively supported in Chrome, Firefox, Edge, and Opera — no plugins required.
Open & Royalty-Free
WebM uses patent-free codecs with no licensing costs — safe for all commercial and open-source use.
100% Browser-Based
FFmpeg WebAssembly encodes MP4 to WebM locally — no server upload, complete privacy.
No File Size Limits
Local processing removes server-enforced upload caps on your MP4 files.
Free to Start — Sign Up for More
Use free with no account for files up to 40 MB. Sign up free to raise your limit to 80 MB, or upgrade to Pro for 250 MB per file.
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