M4V to MP4, in your browser
M4V is Apple’s flavour of the MP4 format. It’s almost the same under the hood, but it’s sometimes bound to Apple software and can behave inconsistently outside the Apple ecosystem. Converting to a standard MP4 produces a clean file that plays reliably on any device, browser or editor.
Mynify converts entirely in your browser — your video is never uploaded to a server.
Good to know
The conversion re-encodes to standard H.264/AAC MP4. The ~30MB engine loads once (then cached). Note that DRM-protected M4V files — such as some iTunes movie purchases — cannot be converted; this tool works on your own, unprotected videos.
Free, unlimited, no signup, no watermark — your video never leaves your device.