Guide · Video

MP4 vs MOV: what's the difference?

Your iPhone records MOV; the rest of the world runs on MP4. The surprising part: they're often carrying the exact same video inside. Here's what actually separates them, and when the difference matters.

They're containers, not codecs

Both MP4 and MOV are containers — wrappers that hold a video stream, an audio stream, and metadata. The thing that determines quality and size is the codecinside (usually H.264 or HEVC for video, AAC for audio), not the container. An iPhone MOV is typically just H.264/HEVC in Apple's QuickTime wrapper — the same codec an MP4 would use. That's why converting MOV to MP4 is often quick and essentially lossless: the video inside doesn't have to be re-encoded, just rewrapped.

Compatibility

MP4 is the universal standard — it plays on virtually every device, browser, editor and social platform without a thought. MOV is a first-class citizen in the Apple world (QuickTime, iMovie, Final Cut, Photos) but can hit friction elsewhere: some Windows software, Android devices and web upload forms prefer or require MP4. If a video is leaving your Apple devices, MP4 is the safe format.

Editing & pro features

MOV has an edge for professional Apple workflows: it's the native home for Apple ProRes and can carry extra tracks (timecode, alpha, multiple audio channels) that some MP4 tools ignore. If you're editing in Final Cut or working with ProRes masters, keep MOV. For everyday clips, the difference is invisible.

When to convert

FileWhirl converts MOV to MP4 with a local ffmpeg engine — files stay private and auto-delete after an hour. Optimising for the web instead? MP4 to WebM goes smaller still for HTML5 video.

TL;DR

Same video inside, different wrapper. MOV for Apple editing and ProRes; MP4 for sharing and universal playback. Converting between them is usually fast and quality-preserving.