Convert WebM to MP4 Online — Free & Instant

How It Works

1. 1Upload your WebM video by dragging it into the drop zone or clicking to browse.
2. 2Click Convert to remux the file as MP4 — no quality loss.
3. 3Click Download to save your MP4.

About WebM to MP4

WebM is the default format for browser screen recordings and many web-based recording tools, but it has limited compatibility outside the web. Many devices, social media platforms (Instagram, TikTok, LinkedIn), video editors (iMovie, Premiere Pro, DaVinci Resolve), and messaging apps do not handle WebM well or at all. This tool transcodes your WebM file to H.264/AAC MP4 — the most widely supported video format across virtually every device, platform, and application. The H.264 codec provides excellent compression while maintaining sharp video quality, and AAC audio ensures the soundtrack comes through cleanly. Uses FFmpeg.wasm running entirely in your browser via WebAssembly, so no video files are uploaded to any server. This makes it safe for converting screen recordings of confidential work, product demos, internal presentations, and any other sensitive content. Common use cases include converting screen recordings for upload to social media, preparing tutorial videos for platforms that require MP4, and making recordings compatible with video editing software for post-production.

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Frequently Asked Questions