WebM is an open video format used by web browsers and screen recorders. MP4 is more widely supported for sharing and playback.

Can I convert screen recordings?

Yes! WebM files from screen recorders (like Chrome's built-in recorder) convert perfectly to MP4.

Is WebM to MP4 lossless?

The conversion re-encodes the video. Use High Quality setting to minimize quality loss during conversion.

WebM to MP4 Offline Converter

Convert WebM videos to MP4 format completely offline in your browser

No Upload 100% Private Free

Loading Video Processing Engine

This tool uses FFmpeg.wasm for video processing. The first time you use it, it will download the processing engine (~25MB). This only happens once and enables powerful offline video conversion.

Initializing video processor...

Drop your WebM videos here

or click to select WebM files

Conversion Settings

Video Quality

Output Resolution

Fast mode (prioritize speed over compression)

Perfect for WebM Screen Recordings

Screen Recordings

Convert WebM screen recordings from Chrome and other browsers to MP4.

Easy Sharing

Share your videos on any platform, device, or social media without issues.

Size Optimization

Reduce file sizes while maintaining quality for easier storage and sharing.

MP4 Works Everywhere

Android Devices

Windows PCs

Web Browsers

Smart TVs

Social Media

Game Consoles

Email Attachments

Cloud Storage