WebM Compressor

Drag your WebM files here

Or

A dedicated WebM compressor for front-end developers. Recompress VP9 WebM to the smallest size your design can tolerate, with alpha preserved for transparent clips.

How to use the WebM Compressor

  1. Add your WebM filesDrag them onto the drop zone above, or click to browse. Add as many as you like — they stay on your computer.
  2. Tune the settingsSet quality, frame rate and scale. Leave Transparency on to keep any alpha channel.
  3. Convert and downloadClick Convert. Each finished compressed WebM file gets its own download button, or grab everything with Download all.

Compressing WebM for performance

Decorative and background videos are often the heaviest assets on a page. Encoding them at quality 45–60 and at their displayed size keeps Lighthouse and Core Web Vitals happy.

Capping the frame rate at 24–30 fps is another easy saving for ambient motion.

Frequently asked questions

How small can I make a WebM?

It depends on content, but short ambient loops at 720p often land under 1 MB.

Does it support VP8 WebM input?

Yes; output is VP9.

Does compressing keep alpha?

Yes, with Transparency on.

Related converters