Tools / File Converter / MP4 to WEBM Converter

MP4 to WEBM Converter

Convert MP4 files to WEBM. Free, without uploading.

This tool converts MP4 files to WEBM. MP4 is the most widely used video format. It usually holds H.264 video and AAC audio and plays on phones, browsers, TVs and social networks.

WEBM is an open video format built for the web (VP8/VP9 video, Opus audio). Browsers play it natively. The video is re-encoded with VP8 video and Opus audio. You choose the quality and resolution, and can trim it with a start and end time.

Conversion runs on your device; your file is never sent to a server. The components download once on first use, and later conversions start right away.

How to use

1. Choose the MP4 video, drag it in, or paste its link.
2. Choose the quality and resolution; optionally enter trim times.
3. Press "Convert" and download the WEBM file.

Frequently asked questions

How long does MP4 to WEBM take?

It runs on your device’s processor. On a computer a one-minute 1080p video usually takes a minute or two; lowering the resolution speeds it up.

Is there a file size limit?

No fixed limit; your device’s memory decides. Computers usually handle files up to 1–2 GB.

Is my file uploaded?

No. Your MP4 file is converted to WEBM inside your browser.