Convert MP4 to WebM Online - Free
Convert MP4 videos to WebM format online for free. WebM offers smaller file sizes ideal for web embedding.
Upload files
or drag and drop files here
Max file size: 500MB
Your files are processed locally in your browser. Nothing is uploaded to any server.
How to Convert MP4 to WebM
Upload MP4 Video
Select your MP4 video file. All processing happens locally in your browser using WebAssembly-powered FFmpeg.
Convert to WebM
Choose WebM as output format. Adjust resolution and quality settings to optimize for your web embedding needs.
Download WebM File
Save your converted WebM video. It is optimized for HTML5 video playback and web page embedding.
Frequently Asked Questions
What are the advantages of WebM over MP4?
WebM is an open, royalty-free format developed by Google, making it ideal for web use without licensing concerns. WebM files using VP9 codec deliver comparable quality to MP4 H.264 at smaller file sizes, improving page load times and reducing bandwidth costs for websites.
Can all browsers play WebM videos?
Chrome, Firefox, Edge, and Opera fully support WebM playback. Safari added WebM support in version 14.1. For maximum compatibility, many websites serve both WebM and MP4 using the HTML5 video element with multiple source tags, letting browsers choose the format they support best.
Does MP4 to WebM conversion take long?
Conversion time depends on video length, resolution, and your device performance. Short clips under 2 minutes typically convert in 30-60 seconds. Since processing runs entirely in your browser via WebAssembly, faster CPUs produce faster results. No video data is uploaded to any server.