WebM to MP4 Converter

Convert and compress WebM videos to MP4 — 100% free, forever. No subscriptions, no credits, no file size limits, no sign-up required.
🔒 100% Offline ⚡ Runs in Your Browser ♾ Unlimited Conversions 🚫 No Account Needed
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Drop WebM Videos Here

Select or drop one or more .webm files — converted locally, never uploaded

🔄 Need to do the exact opposite? Try our MP4 to WebM Optimizer

Free WebM to MP4 Converter — 100% Private & Offline

This WebM to MP4 converter runs entirely inside your browser using WebAssembly. Your video files are never uploaded to any server — all processing happens locally on your device. This means your files stay completely private, even without an internet connection after the page loads.

Completely free, no strings attached. There are no subscription plans, no credit systems, no watermarks, no file size caps, and no daily conversion limits. You can convert as many WebM videos as you want, as many times as you want — for free, forever.

Why convert WebM to MP4? MP4 is a royalty-free, open video format developed for the web. MP4 files are typically 30–70% smaller than equivalent WebM files, making them ideal for websites, web apps, and streaming. All major browsers (Chrome, Firefox, Edge, Safari) support MP4 natively.

Batch conversion support. Select multiple WebM files at once and convert them all in a single session. Once done, download each file individually or grab them all together in a single ZIP archive — no extra software needed.

Your privacy is guaranteed by design. Because conversion happens entirely offline in your browser, there is no risk of your videos being stored, analyzed, or shared. No account, no email, no tracking — just open the page and convert.

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Frequently Asked Questions

Why do I need to convert WebM to MP4? +
WebM is an excellent format for playing videos in web browsers, but it is not natively supported by many default video editors, Apple devices (iPhones, Macs), or older smart TVs. MP4 provides maximum universal compatibility.
Will I lose video quality during the conversion? +
The tool uses high-quality H.264 encoding when transcoding WebM to MP4. While a full conversion inherently involves some data loss, our standard settings ensure the visual difference is virtually imperceptible.
Are there any file size limits? +
No. Because the video processing happens entirely on your local machine using your browser, you are only limited by your computer's RAM and processing power, not arbitrary server upload limits.