MP4 to WebM

MP4 to WebM features

• 01

  Smaller files for the web

  WebM with VP9 encoding typically produces files 20–40% smaller than equivalent H.264 MP4 at the same visual quality, reducing page load times and bandwidth costs.

• 02

  Adjustable quality

  Use the quality slider to find the right balance between file size and sharpness. A setting of 70–80 gives excellent results for most web video content.

• 03

  100% private, runs in your browser

  Powered by FFmpeg compiled to WebAssembly, all conversion happens locally on your device. Your video is never uploaded to any server.

MP4 to WebM FAQ

How do I convert MP4 to WebM?

Drop your MP4 file onto the upload area (or click Choose file), adjust the quality slider if needed, then click Convert. Download the WebM file when conversion is complete.

Why convert MP4 to WebM?

WebM is an open, royalty-free format optimized for web delivery. It produces smaller files than MP4 at the same quality, and is natively supported in all modern browsers without any plugins. It’s the recommended format for <video> elements on websites.

Do all browsers support WebM?

Yes. Chrome, Firefox, Edge, and Opera have supported WebM since 2010. Safari added support in version 14.1 (2021). Global browser support is over 97%.

Will there be quality loss when converting to WebM?

VP9 encoding involves re-encoding, so there is some quality trade-off. At a quality setting of 75 or above, the difference from the original is barely perceptible for typical video content. Use higher quality settings for footage with fine detail or fast motion.

Is my video uploaded to a server?

No. The converter runs entirely inside your browser using FFmpeg WebAssembly. Your video files never leave your device and nothing is stored or logged.