WebM to MP4 Converter
Convert WebM videos to universally compatible MP4 format. Runs in your browser — your files stay on your device.
Drop your WebM file here or click to browse
Max file size: 200 MB
How to Convert WebM to MP4
Select Your WebM File
Click the upload area or drag and drop your WebM video. Max file size is 200 MB.
Convert to MP4
Click Convert and your WebM will be re-encoded to H.264 MP4 format.
Download MP4
Save the MP4 file. Compatible with all browsers, social media, and video editors.
Frequently Asked Questions
What is WebM and why convert it to MP4?
WebM is an open video format developed by Google, commonly used on the web. While modern browsers support it, many devices, video editors, and social media platforms prefer or require MP4. Converting to MP4 ensures maximum compatibility.
Will the video quality change during conversion?
There is minimal quality impact. The converter re-encodes your video using H.264 with AAC audio, which is the industry standard for web video. The output is optimized for broad compatibility and fast playback.
What are the compatibility benefits of MP4 over WebM?
MP4 (H.264) is supported by virtually every device, browser, and platform including iPhones, Android devices, Windows, macOS, and all major social media platforms like Instagram, TikTok, and Facebook. WebM has more limited support, especially on Apple devices.
Will the file size change after conversion?
File size may increase slightly since WebM (VP8/VP9) can be more efficient than H.264 at the same quality. However, MP4 files are far more widely accepted and the difference is usually small.
How long does conversion take?
It depends on the file size and your device. A 30-second clip typically converts in 10-30 seconds. Larger files take longer since all processing runs locally in your browser.
Is my video uploaded to a server?
No. Everything runs locally in your browser using WebAssembly technology. Your video file never leaves your device, ensuring complete privacy.
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