WebM to MP4 Converter
Convert WebM web videos to broadly compatible MP4 in your browser.
WebM is built for the web and streams efficiently, but plenty of video editors, phones, and apps still expect MP4. This converter bridges the gap so you can use web-captured clips anywhere.
It's handy for screen recordings and downloaded web video. Everything is processed locally — your clips are never uploaded.
How to convert WebM to MP4
- 1Drop your WebM file into the area above — or click to browse.
- 2The output format is already set to MP4. Adjust the quality settings if the format supports them.
- 3Click convert, then download your MP4 file. Everything runs locally — nothing is uploaded.
Frequently asked questions
Many editing apps don't support WebM's VP8/VP9 codecs natively. Converting to MP4 (H.264) produces a file that imports cleanly into almost any editor.
The video is re-encoded, so a slight change is possible, but default settings aim to retain the original's visual quality while maximizing compatibility.
No. All processing happens entirely in your browser. Your data never leaves your device — nothing is uploaded to any server.
Yes. Once the page has loaded, the tool works completely offline. For the best experience, install PrivaDeck as a PWA from your browser.
Other conversions
Need a different format?
Open the full video converter to switch between MP4, MKV and AVI, choose H.264 or H.265, and convert with hardware acceleration where available.
Open the full Video Converter