WEBM to MP4 Converter
Convert WEBM to MP4 free, right in your browser.
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About the WEBM to MP4 converter
The WEBM to MP4 converter changes a WEBM file into MP4, right in your browser. Upload your WEBM file and download the MP4 version — free, with no sign-up, no watermark, and nothing uploaded.
WebM is an open, web-optimised video format designed for fast streaming in browsers. MP4 is the most widely supported video format — it plays on virtually every phone, browser and player. The conversion runs on an in-browser build of ffmpeg, so your file is processed entirely on your own device and never sent to a server.
Frequently asked questions
- Is the WEBM to MP4 converter free?
- Yes — completely free, with no sign-up, no watermark and no limits.
- Is my file uploaded to a server?
- No. It runs an in-browser build of ffmpeg, so your file is processed entirely on your own device and never uploaded.
- Will converting to MP4 lose quality?
- Converting re-encodes the file to MP4, which is lossy, but the settings are tuned to keep quality high for everyday use.
- Why convert WEBM to MP4?
- MP4 is the most widely supported video format — it plays on virtually every phone, browser and player. Converting to MP4 makes the file easier to use wherever MP4 is expected.
- Why does the first run take a moment?
- The first time, it downloads a ~32 MB processing engine, which is cached afterwards so later conversions start instantly.