MP4 to WebM Converter
Convert MP4 to WebM for optimized web video delivery.
Video Converter
Convert videos between different formats (powered by WebCodecs)
Why Convert MP4 to WebM?
WebM is an open format optimized for the web, offering good compression with VP8/VP9 codecs. It is the preferred format for HTML5 video on many web platforms.
Features
100% Private
Files never leave your device. All processing happens in your browser.
Instant Conversion
No waiting for server uploads. Convert MP4 to WebM in seconds.
Free & Unlimited
No signup, no limits, no watermarks. Convert as many files as you need.
Batch Support
Upload multiple files and convert them all at once with consistent settings.
Frequently Asked Questions
Why use WebM instead of MP4?
WebM is royalty-free and optimized for web streaming. Some web platforms prefer WebM, and it can offer better compression at lower bitrates.
Is WebM supported on all devices?
WebM works in all modern browsers but has limited support in native apps on iOS and some media players. Use MP4 as a fallback.
How long does conversion take?
Conversion time depends on video length and resolution. A 1-minute 1080p video typically converts in 30-60 seconds.
Is my video uploaded anywhere?
No. All processing happens locally in your browser using WebAssembly.
Can I convert 4K videos?
Yes, though 4K videos will take longer to process and require more memory. Ensure you have sufficient RAM available.
How It Works
This converter uses your browser's built-in WebAssembly to process files locally. Your MP4 files are decoded and re-encoded as WebM entirely on your device. Nothing is uploaded to any server.
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