WebFaz Video Converter

MP4 to WebM

PT

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MP4 to WebM: light video for sites and browsers

WebM is an open format, well accepted by browsers and used on sites. Convert your MP4 to WebM (VP9 with Opus audio). Since the codecs change, the video is re-encoded. Note: in this tool the WebM can come out bigger than the original MP4 (in a test, a 1.2 MB MP4 became 2.3 to 2.6 MB), so use this format when you need it, not to save space.

Drag your video here or click to choose

MP4, M4V — one file at a time

⚡ 100% private

How to do it, step by step

  1. Select the MP4 file.
  2. Choose the Quality: Compact produces the smallest file among the options; Auto and High keep more detail.
  3. Click Convert video (re-encoding may take a while).
  4. Download the WebM.

See where to click, with an image of the tool →

When this is useful

Videos on web pages

WebM is widely supported by current browsers.

Workflows that ask for WebM

Some sites, tools and development projects require WebM.

Tips for a good result

  • If the file needs to be small, convert and then reduce with WebFaz Video Compressor, which also produces WebM.
  • Not every editor and old device opens WebM: check where you will use it.

What this tool does not do

  • Re-encoding is slower than a container swap and has some loss.
  • iPhones and older programs may not play WebM.
  • The app does not change the resolution or aspect ratio.
  • The new file carries the “WebFaz.com” credit in the metadata (comment and artist).

Frequently asked questions

Is WebM smaller than MP4?
Not necessarily. In this tool, in a test, the WebM came out bigger than the original MP4 at every quality. To reduce the size, use WebFaz Video Compressor.
Can I go back to MP4?
Yes, use the WebM to MP4 page.

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Text written by Marcelo Amantino · updated October 18, 2026 · who we are