MP4 to WebM Converter

Convert your MP4 videos to WebM format for HTML5 video and web use. Free, fast, and secure.

Drag and drop your MP4 video here

Max file size 500MB. Free, no registration required.

How to Use

1

Upload your MP4 file by clicking the upload area or drag and drop

2

Select your preferred output quality (high, medium, or low)

3

Click 'Convert' to transform your MP4 to WebM format

4

Download your converted WebM video file

Why choose our converter?

Quality, speed, and security for all your conversions.

High-quality conversion

Precise file conversion without any loss of quality.

100% browser-based

Files never leave your device. All processing happens locally.

Works on all devices

Computer, tablet, or smartphone — any browser works.

Fast processing

Convert files in seconds with our optimized engine.

No registration

Start converting immediately. No sign-up needed.

Batch conversion

Convert multiple files at once to save time.

About This Tool

MP4 is the most popular video format, but WebM is the preferred open format for HTML5 video on the web. Developed by Google, WebM uses VP8/VP9 video codecs and Vorbis/Opus audio codecs, providing excellent compression and quality. This free converter transforms your MP4 files to WebM — ideal for embedding videos on websites, web apps, and platforms that prefer open formats. All processing happens directly in your browser using WebAssembly technology for complete privacy.

Frequently Asked Questions

What is WebM format?
WebM is an open, royalty-free media format designed for the web. It was developed by Google and uses VP8/VP9 for video and Vorbis/Opus for audio. WebM files are optimized for HTML5 video playback in web browsers.
Why convert MP4 to WebM?
WebM is the preferred format for HTML5 video elements and is natively supported by Chrome, Firefox, Edge, and Opera. It's royalty-free, offers great compression, and is ideal for web developers who want to embed videos without licensing concerns.
Which browsers support WebM?
WebM is supported by all major browsers including Chrome, Firefox, Edge, and Opera. Safari added WebM support in version 14.1 (macOS Big Sur) and later. It's the most widely supported open video format on the web.
Will I lose quality when converting MP4 to WebM?
With our 'High' quality setting, quality loss is minimal. WebM with VP9 codec provides excellent quality at comparable or smaller file sizes than MP4 with H.264. You can choose between quality settings to balance file size and visual quality.
What's the maximum file size I can convert?
The maximum file size is 500MB. For larger files, consider using desktop video conversion software like HandBrake or FFmpeg.

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