MP4 to WEBM
Converts MP4 files to WebM format — universal video playback on any device to web-optimized video. All conversion happens locally in your browser with no file size limits.
Runs on FFmpeg
How to Use the MP4 to WEBM
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Frequently Asked Questions
Why convert MP4 to WebM?
MP4 (MPEG-4 Part 14) uses lossy compressed encoding and is best for universal video playback on any device — phones, smart TVs, web browsers, and social media. WebM (WebM Video) uses lossy compressed encoding and excels at web-optimized video — streaming, embedded players, and HTML5 video tags with fast loading. Converting between them lets you take advantage of each format's strengths — for example, using a compressed format for sharing and a lossless format for editing. All conversion happens locally in your browser with no file size limits.
How much smaller is WebM?
Typically 30–50% smaller than H.264 MP4 at equal quality — a 100 MB homepage video lands near 60 MB. Multiply across a media library for real bandwidth wins.
Which browsers play WebM?
All modern browsers play WebM; Safari joined fully in recent versions. Serve WebM primary with MP4 fallback for certainty.
What settings?
CRF 30–33 for web embeds balances size and looks. Talking heads compress further than action footage.
Do embed files upload?
No — conversion runs locally in your browser with FFmpeg. Only saves touch the network — downloads are unlimited.
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Last updated October 2026