The follow-up to the HEIC photo issue is the MOV video problem, and it has the identical plot. An iPhone records something impressive. The file is transferred to a Windows PC, a work laptop, an old smart TV, a projector at a funeral where it absolutely has to play. And the device replies: can't open this.
Same cause as the photos, too: Apple's defaults ahead, the rest of the world lagging.
What a MOV file actually is
MOV is the container format used by Apple's QuickTime, and the term container is the key one. A MOV file is essentially a box. Within that box are the real video and audio streams, encoded with some codec, and the box and its contents fail on other devices for different reasons:
- The box problem. Some players and editors just don't read QuickTime containers well, or need extra components to try.
- The contents problem. Nowadays iPhones tend to record video using HEVC, the same high-efficiency codec family behind HEIC photos. HEVC halves file sizes, is subject to patent restrictions, and on Windows often requires a codec the computer doesn't have, leading to the classic situation where the audio plays but the screen stays black.
A MOV can fail because the box is unfamiliar, because the contents need a missing codec, or both. The solution in all three cases is the same move.
The fix: convert MOV to MP4
MP4 is the default video box used around the world, and combined with the H.264 codec it works on virtually everything made this century: Windows, Android, TVs, projectors, browsers, PowerPoint, the lot.
Convert MOV to MP4 here, free:
- Drop your MOV files in (up to three at a time free, each up to 1 GB).
- MP4 is selected by default. Click Convert.
- Download it and send it to any destination.
The conversion takes place on your own device using FFmpeg compiled to WebAssembly, which is important for video in two ways. Firstly, privacy: videos are typically the most personal files you possess, and here they never leave your machine. Secondly, time: an upload-based converter has to receive the entire gigabyte before it can begin, and typical home upload speeds make that the slowest part of the whole process. Converting locally skips that step altogether.
The initial media conversion downloads the FFmpeg engine itself (approximately 31 MB, cached afterward). Engine code coming down to you, never your video going up.
Stop it at the source
If your videos keep making this trip, change the default on the iPhone:
Settings → Camera → Formats → Most Compatible. The camera then records H.264 video (and JPG photos), which plays back everywhere without conversion. The drawback is file size: the High Efficiency default stores noticeably more footage in the same amount of space, which is precisely why Apple selected it.
A reasonable split: those who mostly keep video within the Apple ecosystem stick with High Efficiency and convert the occasional traveler, while people who frequently send video to Windows and Android switch to Most Compatible and accept the storage cost.
The related rescues
The same converter family handles the neighboring emergencies:
- Video needs to be a GIF for a chat or a doc: MOV to GIF or MP4 to GIF.
- All you need is the sound (a lecture, a voice memo recorded as video): MOV to MP3, detailed in our audio extraction guide.
- The other direction entirely: MP4 to MOV, for the rare tool that insists on QuickTime.
- Old formats from older devices: AVI to MP4 and MKV to MP4 retire the files your 2009 camcorder and your download folder left behind.
Common questions
Will there be a loss of quality? Re-encoding video is in principle a lossy process, but at the settings we use the difference isn't something you'll notice on playback. Either way, the original remains unchanged on your device.
Why is the MOV fine on my Mac? Apple devices come with the QuickTime container and HEVC codec support built in. The file isn't damaged. It just speaks a dialect Windows hasn't fully licensed.
How long does it take? Depends on your hardware and the video's length, as your own processor carries out the task. Short clips complete in a matter of seconds, while a long 4K video takes minutes. The honest cost of local conversion: your electricity, nobody's server.
What about files over 1 GB? That figure is the free tier's per-file line. FormatFusion Pro (a one-off $29) raises it to your device's practical ceiling, about 1.5 GB for video in browser memory.