Convert WebM to MP4
Private by design: the conversion runs on your device. Nothing is uploaded.
- Choose the target format
- Drop your file (or click to browse)
- Download the converted file
0 bytes left your browserWhy is this limited?
Output format: mp4
A WebM downloaded from a site or exported by a screen recorder plays fine in a browser and then stalls everywhere else: editors, phones, smart TVs and upload forms all expect an MP4. Rewriting it with H.264 video and AAC audio is what makes the clip ordinary again. The faststart flag is set as the file is written, so playback can begin before the download has finished.
Frequently asked questions
- Why will my editor not import a WebM?
- Most editing software built its format list around H.264 and ProRes, and VP8 or VP9 inside a WebM wrapper was never part of that list. Converting sidesteps the argument entirely.
- Does the picture degrade?
- There is one further encode, done at a high quality setting, so the difference does not show in normal playback. Nothing is resized and the frame rate is left alone.
- How long should the conversion take?
- Roughly real time for a short clip on a laptop and slower on a phone, since every frame is decoded and re-encoded inside this tab.