Video · 4 min read ·
iPhone videos in MOV: how to make them play everywhere
A MOV file from your iPhone may not play on Windows, upload to a site or open in an editor. Here is why, and how to turn it into MP4 in your browser.
You send a video from your iPhone to a Windows PC, a smart TV or a website, and get a black screen, sound without a picture or an “unsupported format” message. The file ends in .mov, and the problem is usually what is inside it.
MOV and MP4 are containers
MOV (Apple QuickTime) and MP4 are containers: boxes that hold a video track, an audio track and some metadata. Both can hold the same H.264 or HEVC video and AAC sound. Apple apps handle MOV natively, while Windows apps, some editors and many upload forms expect MP4.
The real culprit is often HEVC
Recent iPhones record in HEVC (H.265) by default to save space. Many older PCs, browsers and TVs can’t decode HEVC without extra codecs, so even a renamed file won’t play. H.264 inside MP4 is the combination that plays on practically every phone, computer, TV and social network.
Convert in the browser
The 4Dev MOV to MP4 converter reads the file on your own device; nothing is uploaded to 4Dev or anyone else. If the video is already H.264, the “Keep original quality” option can repackage it into MP4 without re-encoding, which is fast and lossless. Otherwise it re-encodes the video, and you can choose the quality, the resolution or a target file size.
IMG_0412.MOV HEVC · 4K · 380 MB → IMG_0412.mp4 H.264 · 1080p · ~60 MBWhich settings to choose
The right choice depends on where the video is going. A few rules of thumb:
- Sharing in a chat or by email: 1080p or 720p, or a target size. Many email services cap attachments at about 25 MB.
- Uploading to a website or a form: H.264 in MP4 at 1080p is accepted almost everywhere.
- Editing on a Windows PC: keep the original resolution and pick the highest quality, so you don’t lose detail before the edit.
- Archiving: keep the original MOV file as well. Every re-encode loses a little quality, so convert copies, not your only file.
Will I lose quality?
Repackaging H.264 from MOV to MP4 loses nothing: the video and audio streams are copied as they are. Re-encoding HEVC to H.264 is lossy, but at 1080p and a sensible quality setting the difference is hard to see on a phone or laptop screen. The biggest savings come from lowering the resolution: a 4K clip has four times as many pixels as the same clip in 1080p.
Limits worth knowing
Files can be up to 500 MB. It works in current Chrome, Edge, Safari and Firefox on a computer and in Chrome or Safari on a phone, and the format list only offers what your browser can actually create. Long 4K clips take a while, so for a quick share pick 1080p or a target size.
Tip: the iPhone setting
Settings → Camera → Formats → “Most Compatible” makes the iPhone record H.264 instead of HEVC. The files are bigger, so many people keep HEVC and convert only the videos they share.
Why renaming the file doesn’t help
Changing IMG_0412.MOV to IMG_0412.mp4 only changes the label on the box. If the video inside is HEVC, a device that can’t decode HEVC still can’t play it. Sometimes a renamed H.264 file does play, but it is not a proper MP4, and strict upload forms can still reject it. Converting rewrites the container correctly and, when needed, the video itself.