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MP4 to WebM Converter

Make a smaller, royalty-free WebM for the web from any MP4.

Converters Reviews Free · no sign-up

Drop an MP4 here, or click to choose one

Converted on your device — the video is never uploaded

Result

Quick Tool Overview

The MP4 to WebM Converter produces a smaller, royalty-free WebM for your own website, with bitrate, resolution and frame rate control.

What it does
Converts MP4 video to WebM
You give it
An MP4, MOV, MKV or AVI
You get back
A WebM for the web
Best for
Video on a site you run yourself
Converters Free, unlimited use No sign-up Runs in your browser

About the MP4 to WebM Converter

For video on your own website, WebM is usually the better file: smaller than H.264 at the same quality, royalty-free, and supported by every modern browser. Getting one normally means installing ffmpeg.

The conversion runs in your browser through ffmpeg.wasm — the real ffmpeg, compiled to WebAssembly. Nothing is uploaded: a wedding video, a client recording or an unreleased track never leaves your machine. The engine is a one-off download of about 32 MB, after which your browser caches it and every later conversion starts immediately.

Choose the video bitrate for the resolution you are targeting, scale the picture down, change the frame rate, trim to a section or remove the audio. The usual advice for a web page still applies and is repeated on the tool: offer the WebM first and an MP4 after it, and every browser will pick the one it can play — older Safari and most televisions still need the MP4.

Key features of the MP4 to WebM Converter

Smaller at the same quality

VP8 and VP9 beat H.264 on size, and are royalty-free.

Bitrate per resolution

Presets that match 1080p, 720p and 480p.

Practical advice

The page explains why you should still offer an MP4 alongside.

Trim as you convert

Give a start time and a length to take just the part you need.

Nothing is uploaded

ffmpeg runs inside the browser tab, so the file never leaves your computer.

How to use the MP4 to WebM Converter

  1. 1

    Drop the MP4 in

    MOV, MKV and AVI work as well.

  2. 2

    Pick a bitrate for the size

    1000 kb/s suits 720p, 2000 kb/s suits 1080p.

  3. 3

    Scale down if you can

    The single biggest saving for web video.

  4. 4

    Convert and download

    Offer it alongside an MP4.

Frequently asked questions

At the same visual quality, usually yes — VP9 more so than VP8. It is also royalty-free, which matters if you are serving a lot of video.

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