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MP4 to WebM Online Free — PrivaTools

TL;DR: Upload your file, click MP4, and download the result — free, browser-based, no sign-up, no watermarks. Files are processed and discarded immediately.

Convert MP4 to WebM online for free — re-encode MP4 video as WebM (VP9) for smaller files and royalty-free open-web streaming.

Using MP4 to WebM doesn't require an account, an email address, or a paid plan. Your file is held in temp memory only for the duration of processing, then permanently unlinked. No watermarks, no upsells, no behavioural tracking.

How to Use MP4 to WebM

  1. Upload an MP4 video — Drop an .mp4 file (H.264 or H.265).
  2. Convert and download — Click Convert. The video is re-encoded as VP9 WebM — smaller files at the same quality, ideal for HTML5 video on the open web.

Frequently Asked Questions

Why convert MP4 to WebM?

WebM uses VP9, which is royalty-free and often produces smaller files than H.264 at the same quality. Ideal for hosting video on the open web.

Will every browser play it?

Every modern desktop browser plays WebM. Safari on iOS supports it from iOS 16 onward. For maximum compatibility, MP4 is still safer.

How much smaller will it be?

Typically 20–40% smaller than the equivalent MP4 at the same visible quality.

Last reviewed 2026-05-01 by the PrivaTools maintainers. Source code on (MIT-licensed, self-hostable).

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