WebM to MP4 Converter
Convert WebM videos to universally compatible MP4 format.
Video Converter
Convert videos between different formats (powered by WebCodecs)
Why Convert WebM to MP4?
MP4 is the most widely supported video format across devices, players, and platforms. Converting WebM to MP4 ensures your videos play everywhere, from iPhones to smart TVs.
Features
100% Private
Files never leave your device. All processing happens in your browser.
Instant Conversion
No waiting for server uploads. Convert WebM to MP4 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 convert WebM to MP4?
MP4 (H.264) is supported by virtually every device and platform. WebM has limited support on Apple devices and some media players.
Will there be quality loss?
There may be minimal quality loss due to re-encoding. The converter uses high-quality settings to minimize any visible difference.
Is the conversion done in my browser?
Yes. The conversion uses WebAssembly-based processing in your browser. Your video files are never uploaded to any server.
Is there a file size limit?
Browser-based conversion works best with files under 500MB. Larger files may be slow or run into memory limits depending on your device.
Will audio be preserved?
Yes. Both video and audio tracks are converted and preserved in the output MP4 file.
How It Works
This converter uses your browser's built-in WebAssembly to process files locally. Your WebM files are decoded and re-encoded as MP4 entirely on your device. Nothing is uploaded to any server.
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