How to convert MOV to MP4 (iPhone videos on Windows)
You sent an iPhone video to someone on Windows and it would not open. The culprit is Apple's MOV container and the HEVC codec inside it. Here is why, and the one-step fix.
It is one of the most common video problems there is: you record something on your iPhone, send it to a friend or a colleague on Windows, and they reply that it will not open. Nothing is broken. The video is fine. It is just wearing a format that Apple devices understand instinctively and other systems often do not.
This guide explains exactly why iPhone video trips up Windows and Android, the difference between the MOV container and the codec inside it, and how to convert to MP4 so the clip opens for everyone — without uploading a personal recording to a stranger's server.
Why will my iPhone video not play on Windows?
Two things about iPhone video conspire here. First, the file is a MOV — Apple's QuickTime container — and while Windows can sometimes open MOV, support is inconsistent across players. Second, and more importantly, modern iPhones default to recording with HEVC, also called H.265, a newer and more efficient codec that many Windows and Android setups cannot decode without extra software.
So the recipient hits a double hurdle: an unfamiliar box and, inside it, contents their device does not know how to unpack. On an iPhone or Mac both are native, which is why the video plays perfectly for you and fails for them.
What is the difference between MOV and MP4?
MOV and MP4 are close relatives — MP4 was actually derived from Apple's QuickTime format — so structurally they are similar. The real difference is reach. MOV is an Apple format that is fully supported on Apple hardware and patchily elsewhere. MP4 is the universal standard that plays on everything. When both hold H.264 video, converting between them is close to just rewrapping the same content in a more widely accepted box.
| MOV | MP4 | |
|---|---|---|
| Origin | Apple QuickTime | International standard |
| Plays on Apple devices | Yes, natively | Yes |
| Plays on Windows / Android | Patchy | Yes |
| Common iPhone codec inside | HEVC (H.265) | H.264 after conversion |
| Social upload compatibility | Sometimes | Yes |
| Best for | Editing on a Mac | Sharing with anyone |
If you are ever unsure which codec your file actually holds, the video file info tool reads it out — handy for confirming whether a "MOV problem" is really an HEVC problem before you convert.
How do you convert MOV to MP4?
The conversion is a single step. Load your MOV into the MOV to MP4 tool and export — it re-encodes the video to H.264 inside an MP4 container, the combination that plays everywhere. Because it runs in your browser, the recording is read from your disk and processed on your device, so a private family video never leaves your machine.
- Open the MOV to MP4 tool and load your iPhone video.
- Leave the output as H.264 MP4 for maximum compatibility.
- If the clip is long or huge, trim or compress it in the same session to keep the file manageable.
- Export and share the MP4 — it will now open on Windows, Android and every social platform.
Can you stop the iPhone making MOV files?
Partly. You cannot make an iPhone record MP4, but you can steer it away from the HEVC codec that causes most of the trouble. In Settings, under Camera, then Formats, choosing "Most Compatible" tells the iPhone to record H.264 instead of HEVC. The file is still technically a MOV, but with H.264 inside it plays far more widely — and you avoid the codec hurdle before it starts.
That said, converting after the fact is still the surest path, because it guarantees an MP4 that nothing will reject. For anything you plan to share broadly, a quick pass through the converter is worth it regardless of the camera setting.
What if you only need the audio or a clip?
Sometimes converting the whole file is more than you need. If you only want a section, trim first with the trim video tool so you convert just the part that matters. And if the recording is really about the sound — an interview, a voice memo captured on video — video to MP3 lifts the audio straight out, sidestepping the format question entirely and producing a much smaller file.
For larger jobs where the MP4 is still too heavy to send, follow the conversion with a pass through compress video to bring it down to a shareable size.
Frequently asked questions
Will converting MOV to MP4 lose quality?
A small amount, because the video is re-encoded. Starting from the original high-quality recording and using a sensible quality setting keeps the loss invisible in practice. The gain — a file that actually plays for the recipient — is well worth it.
Why does my MOV play on my Mac but not their PC?
Because your Mac supports both the MOV container and the HEVC codec natively, while their PC may support neither without extra software. Converting to H.264 MP4 removes both dependencies so the video plays regardless of the device.
Is my video uploaded to convert it?
No. The conversion runs entirely in your browser with ffmpeg compiled to WebAssembly, so the file stays on your device. Nothing is sent to a server, which matters for personal recordings you would rather not hand to an unknown site.
How long does the conversion take?
It depends on the length and resolution, and the in-browser engine is single-threaded, so a long 4K clip takes longer than a desktop app would. Short clips are quick; for a big file, expect a few minutes and keep the tab open while it works.