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WebM to MP4

Convert a WebM video to an H.264 MP4 that plays everywhere — in your browser.

Select a video file

WebM (VP8/VP9) — converted to H.264 MP4 in your browser

Click to choose, or drop a file here

How to WebM to MP4

  1. 1

    Add your WebM

    Drop in the .webm file — it's read in your browser.

  2. 2

    Convert

    Click Convert to MP4; the video is decoded and re-encoded as H.264/AAC with the WebCodecs API.

  3. 3

    Download

    Save the MP4 — it plays on iPhone, in Premiere, on social media, everywhere.

Related PDF tools

Compress VideonewShrink an MP4, MOV or WebM by re-encoding it at a lower bitrate — in your browser, nothing uploaded.MP4 to WebMnewConvert an MP4 to a smaller VP9 WebM for the web — in your browser.Video to GIFnewTurn a short video clip (MP4, MOV, WebM) into an animated GIF — in your browser.Trim VideonewCut a video down to just the part you want, in your browser.

WebM to MP4 — frequently asked questions

Is my file uploaded?+

No. The WebM is decoded and re-encoded to MP4 entirely in your browser with the WebCodecs API.

Why convert WebM to MP4?+

WebM (VP8/VP9) doesn't play on iPhones, in most video editors, or on some social platforms. H.264 MP4 plays essentially everywhere.

Is quality lost?+

It's a re-encode, so there's a small generational loss. At the default quality it's hard to notice; the file size is usually similar or a little larger.

Which browsers work?+

Chrome, Edge and Safari 17+. The tool tells you if your browser can't encode H.264.

Do you upload my files to a server?+

No — every tool here processes your files entirely on your device, and nothing is uploaded to a server. The only exception is the AI tools, which send the extracted text (not the file) to Claude to do their work.

Is there a file size limit?+

There's no artificial limit we impose, but since processing happens in your browser, very large files (500+ MB or 1,000+ pages) are limited by your device's memory rather than by us.