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When a MOV file from an iPhone or a Mac won’t play on Windows or Android, the cause is almost always the video codec inside the file, not the .mov ending. Recent iPhones record in HEVC (H.265) by default, and plenty of PC players, older phones, apps and upload forms can’t decode it. Converting the file to MP4 with H.264 video fixes it, and one camera setting stops it happening again.
What’s actually inside a MOV file
A video file is a box (the container) holding streams of picture and sound, each compressed with a codec. MOV is Apple’s QuickTime container. MP4 was built on the same design, so the two can hold exactly the same streams.
That’s why renaming clip.mov to clip.mp4 sometimes works and sometimes doesn’t. The name was never the real problem. What matters is whether the device playing the file understands the codec.
| What you see | Likely cause | What fixes it |
|---|---|---|
| Picture is black but sound plays | HEVC video the player can’t decode | Convert to MP4 (H.264) |
| “Format not supported” or “Can’t play” | HEVC video, or an app that refuses the .mov ending | Convert to MP4 |
| Upload form rejects the file | The site only accepts .mp4 | Convert to MP4 |
| Plays in VLC but not in the built-in player | Built-in player lacks the HEVC codec | Convert, or add the codec on Windows |
| Nothing plays anywhere, even in VLC | File is damaged or incomplete | Copy it from the phone again |
Why Windows struggles with iPhone videos
Windows can play H.264 out of the box, but HEVC playback in the built-in apps depends on Microsoft’s HEVC Video Extensions from the Microsoft Store. Some PCs have it preinstalled by the manufacturer; many don’t. Without it, Media Player may show a black screen with sound, or refuse the file outright.
Installing that extension helps on your own PC. It doesn’t help when you send the video to someone else, upload it to a website, or open it in an editor that brings its own decoders. Converting once to H.264 makes the file play on all of those.
Why some Android phones can’t play it
Many newer Android phones decode HEVC in hardware, so the same MOV may play on one phone and fail on another. Older or budget phones, some gallery apps and a few messaging apps either don’t support HEVC or don’t accept the .mov ending. An MP4 with H.264 video and AAC sound is the safest combination for Android, WhatsApp and most upload forms.
How to convert MOV to MP4 in your browser
- Open the MOV to MP4 converter.
- Add one or more MOV files.
- Leave Quality on Balanced unless you need a smaller or sharper file.
- Convert and download the MP4, or all the results as a ZIP.
The converter looks inside the file before it starts. If the video is already H.264, it’s copied into an MP4 container without being re-encoded, so it’s quick and the quality doesn’t change. If it’s HEVC or ProRes, it’s re-encoded to H.264 on your device, which takes much longer. For HEVC there’s also a Keep HEVC setting that copies the video as it is; it’s fast, but the result has the same playback problem on PCs without the HEVC extension, so leave it off for the fix described here.
A few things worth knowing before you start:
- The first video conversion downloads the ffmpeg engine, about 32 MB. Your browser keeps it for later conversions.
- The MP4 is built in your browser’s memory, so files over about 1.5 GB are refused, or over about 400 MB on a phone. Big files are better done on a computer.
- HDR clips from recent iPhones come out as standard video, so their colours can look a little flatter.
How to stop it happening again
On the iPhone, open Settings › Camera › Formats and choose Most Compatible. New videos are then recorded in H.264 and play almost everywhere. The files are larger than HEVC, so your storage fills a bit faster. Videos you’ve already recorded stay as they are.
If you copy videos to a PC with a cable, Settings › Photos › Transfer to Mac or PC › Automatic (on recent iOS versions, Settings › Apps › Photos) asks the iPhone to convert to a compatible format during the transfer.
Other video files with the same problem
MKV files from screen recorders and downloads have a similar issue: many phones, TVs and editors won’t open them. The MKV to MP4 converter works the same way. If you only need the sound from a video, MP4 to MP3 pulls out the audio track.