Convert images, documents, video and audio in your browser. Your files stay on your device.
M4V won’t open where you need it? Convert it to WEBM without uploading it: even large files work, because everything happens locally.
Drag one or more M4V files onto the dashed area, or tap it to pick them from your device.
WEBM is already selected. If you want, open the options to trim the video or change its resolution or quality.
Press “Convert to WEBM”. When it’s done, download the files one by one or all together in a ZIP archive.
Good to know. If the video is already compatible with the chosen format it’s copied without re-encoding: the conversion is very fast and the quality identical.
Source format
MPEG-4 Video (Apple variant)
A variant of MP4 used by iTunes and Apple apps. Without DRM protection it’s effectively an MP4 and converts without any trouble.
Target format
WebM (a Google project)
Born for the web, it uses only open, royalty-free codecs. It’s the format many browsers use to record the screen and webcam. Outside the browser, though, it doesn’t always open.
Audio and video use WebCodecs: they work in up-to-date Chrome, Edge, Opera and Samsung Internet, in Firefox 130+ and Safari 17+ (with a few limits on the formats they can create). If your browser can’t create the chosen format, we tell you before you start.
No. The conversion from M4V to WEBM happens entirely in your browser, using your device’s computing power. Files aren’t sent or stored anywhere: when you close the page they’re gone from memory too.
Up to 100 files at a time. There’s no fixed size limit: it depends on your device’s memory. On smartphones it’s best to work in smaller batches with heavy files such as videos.
Yes, with up-to-date Safari, Chrome, Firefox, Edge and Samsung Internet. On phones, converted files end up in the Downloads folder or the Files app.
Only to open the page (and, the first time, to download the components needed for that type of file). After that the conversion keeps working even if the connection drops.