Convert MP4 to WebM

Drag your MP4 files here

Or

Turn MP4 files into compact VP9 WebM video without uploading anything. WebM is an open format that plays natively in Chrome, Firefox and Edge and is often noticeably smaller than an H.264 MP4 at the same visual quality.

How to convert MP4 to WebM

  1. Add your MP4 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 WebM file gets its own download button, or grab everything with Download all.

Why convert MP4 to WebM?

VP9 WebM typically compresses better than H.264 MP4, which means faster-loading hero videos and less bandwidth for your visitors. It is royalty-free and supported by every Chromium browser and Firefox.

For maximum compatibility, serve WebM first and keep an MP4 fallback in your HTML video tag — Safari will pick the MP4 while other browsers get the smaller WebM.

Frequently asked questions

Will converting MP4 to WebM reduce quality?

Any re-encode is lossy, but at the default quality of 75 the difference is hard to see. Raise the quality fader for near-identical output, or lower it for smaller files.

Does the WebM keep my audio?

Yes. Audio is re-encoded to Opus, the standard audio codec for WebM.

Is there a file size limit?

There is no server limit. Very large files are only limited by your computer's memory, since conversion happens locally.

Related converters