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Convert WebM videos to MP4 format. Free, private, runs in your browser.
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WebM is an open, royalty-free video format developed by Google, commonly used for web video. MP4 is the most widely supported video container format, using the H.264 video codec and AAC audio codec. While WebM works great in browsers, MP4 is the universal standard supported by virtually every device, media player, TV, and editing application.
If you've downloaded a video from a website or screen recording tool and it's in WebM format, you may find that your phone, TV, video editor, or media player can't open it. Converting to MP4 ensures your video plays everywhere — iOS, Android, Windows, macOS, smart TVs, and all major video editing software.
Convertful uses FFmpeg compiled to WebAssembly to decode your WebM video and re-encode it as MP4 using the H.264 video codec and AAC audio codec. These codecs provide excellent quality-to-size ratio and universal compatibility. The entire process runs locally in your browser.
Yes. Your video files never leave your device. All processing happens in your browser using FFmpeg WASM.
MP4 is the most widely supported video format. While WebM works in browsers, MP4 plays on virtually every device, TV, and media player.
Yes. The converter uses H.264 encoding which maintains excellent quality at efficient file sizes.