MP4 to WebM Converter

Convert your MP4 videos to WebM for better web compatibility and smaller file sizes. Powered by WebAssembly for 100% private local processing.

Drop MP4 file here or click to upload

Max size depends on your RAM (Recommended < 50MB)

ALL CONVERTERS

About MP4 to WebM

WebM is a modern video format designed specifically for the web. It offers high-quality video playback with significantly smaller file sizes compared to MP4, making it the preferred choice for HTML5 video backgrounds and web-based applications.

Our converter uses FFmpeg.wasm, a powerful technology that runs the world's leading video framework directly inside your browser. This means your videos are never uploaded to a server, ensuring 100% privacy and security for your personal or professional media.

How to Convert MP4 to WebM

  1. Select Video: Drag and drop your .mp4 file or click to browse.
  2. Initialize: The tool will load the FFmpeg engine into your browser's memory.
  3. Transcode: Click "CONVERT TO WEBM". Your computer's processor will handle the encoding locally.
  4. Download: Once finished, the .webm file will be automatically saved to your device.

Frequently Asked Questions

Is this as fast as server-side conversion?

It depends on your computer's CPU. Since it runs in the browser, it might be slightly slower than a high-end server, but it's much faster when you consider there is zero upload/download time for the source file.

Are there file size limits?

The limit is your browser's available memory (RAM). We recommend converting videos under 50MB for the best experience on this client-side tool.

Is my data safe?

Yes. The video stays in your browser's local sandbox. No data is transmitted to our servers.