WebM to MP4 Converter
Convert WebM video files to MP4 format online for universal device compatibility.
About this tool
Convert WebM video files to MP4 format online for universal device compatibility. This tool runs entirely in your browser — no file upload, no account required, and no data is ever sent to a server. Video conversion is powered by FFmpeg compiled to WebAssembly, running entirely inside your browser tab.
- ✅ Free to use, no sign-up required
- ✅ Files never leave your device
- ✅ Powered by WebAssembly — no plugins needed
- ✅ Works on any browser and device
How it works
FFmpeg (compiled to WebAssembly) handles the video transcoding entirely in your browser. Your video is decoded from the source format and re-encoded into the target format. Depending on file size, processing may take a moment.
Frequently Asked Questions
Is WebM to MP4 Converter free to use?
Yes, WebM to MP4 Converter is completely free. There are no usage limits, no sign-up required, and no hidden fees.
Are my files safe when using this tool?
Completely. All processing happens locally in your browser using JavaScript and WebAssembly. Your files are never uploaded to any server and never leave your device.
Does WebM to MP4 Converter work on mobile?
Yes, WebM to MP4 Converter works in any modern browser including mobile browsers on iOS and Android — no app installation required.
Related Tools
MP4 to WebM Converter
Convert MP4 video files to WebM format online. WebM is optimized for the web.
MOV to MP4 Converter
Convert Apple QuickTime MOV files to MP4 format online. Works on any device.
AVI to MP4 Converter
Convert AVI video files to MP4 format online. MP4 is smaller and more compatible.
MP4 to GIF Converter
Convert MP4 video clips to animated GIF online. Perfect for social media and messaging.