Convert WEBM to MP4 — Free, No Upload
Runs entirely in your browser. Nothing is sent to any server.
Video
Audio
Why convert WEBM to MP4?
WebM is a browser-native format used by YouTube downloads and screen recordings. It won't play on iPhones or most TVs. Converting to MP4 gives you a universally compatible file that plays everywhere.
What is WEBM?
WebM is Google's open-source video format, designed for web browsers. Common in screen recordings and downloaded web videos.
What is MP4?
MP4 (MPEG-4) is the most widely supported video format in the world. It plays natively on every phone, TV, browser, and media player.
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Frequently asked questions
Is this WEBM to MP4 converter really free?
Yes, completely free. No account, no credit card, no watermark, no file size limit imposed by a paywall. Convifi is free to use forever.
Is my file safe when I convert WEBM to MP4?
Your file never leaves your device. All conversion happens locally in your browser using WebAssembly. There is no upload to any server — not even Convifi's.
Does this work on iPhone, Mac, and Windows?
Yes. Because it runs in the browser, it works on any device — iPhone, Android, Mac, Windows, or Linux — as long as you have a modern browser like Chrome, Safari, Firefox, or Edge.
How long does WEBM to MP4 conversion take?
Conversion time depends on your file size and device. Most files convert in under 30 seconds. Longer videos or high-resolution images may take a minute or two. Nothing is being sent over the network, so your connection speed has no effect.