MP4 to WebM Converter
Convert MP4 videos to WebM format for free in your browser. No upload, no server — 100% private.
Drop a video file here or click to browse
Accepts: video/mp4
How to use MP4 to WebM
- 1
Click the upload area or drag and drop your MP4 file.
- 2
The video processor loads automatically (first use may take a moment).
- 3
Your video is converted to WebM format entirely in your browser.
- 4
Click Download to save the converted file.
Why use this tool?
- WebM offers smaller file sizes with comparable quality, ideal for web embedding.
- No file size limits — processing happens on your device.
- Your video never leaves your computer. 100% private.
Frequently Asked Questions
Is MP4 to WebM conversion free?
Yes, completely free with no limits. All processing happens in your browser using WebAssembly technology.
Will I lose quality converting MP4 to WebM?
There is minimal quality loss. WebM uses the VP8/VP9 codec which provides excellent quality at smaller file sizes.
Do my files get uploaded to a server?
No. All conversion happens locally in your browser using ffmpeg.wasm. Your files never leave your device.
What browsers support this tool?
All modern browsers including Chrome, Firefox, Edge, and Safari. Chrome typically offers the best performance.
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