Offcloud guide
MOV to MP4 converter: make your iPhone videos play everywhere
You shot a great video on your iPhone, but the MOV file won't open for your friends on Windows or Android. Offcloud converts it to MP4, a format virtually every device, player, and platform understands. It's free, requires no signup, and runs 100% locally in your browser — your video never leaves your device.
Why convert a MOV video to MP4?
MOV is Apple's QuickTime format — it's what your iPhone, iPad, or Mac produces every time you record a video. Inside the Apple ecosystem it works beautifully, but send that same file to a friend on Windows or Android and there's a good chance it simply won't open, or will play without sound. Smart TVs, older media players, and plenty of editing tools are just as picky.
The real fix is to think about the person on the receiving end: whoever you send a video to shouldn't have to care about codecs or hunt for a special player, and with MP4 they never do — it plays natively on Windows, Android, TVs, game consoles, and every major browser. Because MP4 supports the same modern codecs your iPhone records with, switching formats doesn't mean sacrificing your footage. Converting MOV to MP4 is the simplest way to make sure the video you shot actually reaches the people you shot it for.
Your iPhone footage never leaves your device
Most online converters work the same way: you upload your video to their server, wait in a queue, and download the result — trusting someone else's infrastructure with your file along the way. Offcloud takes a different approach. The conversion runs entirely in your browser using WebAssembly, so your MOV stays put: the file is never uploaded, and once the MP4 is ready, your own browser is still the only place your footage has ever been.
That matters more for videos than for almost any other file type, because phone footage is personal — birthdays, kids, vacations, moments you never planned to share with a server. Local processing also removes the usual size restrictions: there is no server-imposed limit, only your device's available memory, so a long 4K iPhone recording simply takes a bit longer to process. In fact, you can run the whole conversion in Safari on the iPhone itself, so the video is already an MP4 before you ever hit send.
What to expect from the converted file
Let's be upfront: no conversion can ever improve your original quality. If the MOV was filmed in low light or heavily compressed, the MP4 will inherit those flaws — a converter can't fix what the camera captured. What you gain is compatibility, and for a video nobody can open, that's everything.
A few practical tips: keep the browser tab open while a large file converts, and hang on to your original MOV until you've confirmed the MP4 plays the way you expect. Very large files aren't a problem, but they do take longer, since your own device is doing all the work. One last thing: your recordings often feature more people than just you, so before you share the MP4 around, make sure the video is yours to send — both in terms of rights and out of courtesy to whoever is in the frame.
Conversion steps
- Open Offcloud in your browser — no signup, no account, and nothing to install.
- Choose the MOV you want to share — pick it from your camera roll on iPhone, or drag it onto the page from a folder on your computer.
- Pick MP4 as the output format and let the conversion run — everything happens locally, and your video is never uploaded.
- Download your new MP4 and share it with anyone, on any device.
Frequently asked questions
Why won't my iPhone videos play on Windows or Android?
iPhones and Macs record in MOV, Apple's QuickTime format, which many Windows programs, Android phones, and smart TVs don't support out of the box. Converting the file to MP4 solves the problem, because MP4 is supported natively almost everywhere.
Will the MP4 I send look worse than the original on my phone?
It shouldn't. MP4 handles the same modern codecs your iPhone records with, so the format change itself doesn't degrade your footage — though no converter can ever make a video look better than what the camera captured. Keep the original MOV until you've confirmed the copy you're sending plays the way you expect.
Can I convert my videos directly on my iPhone, without sending them anywhere?
Yes. Offcloud runs in mobile Safari just like on a computer, and the entire MOV to MP4 conversion happens on the phone itself. Your footage is never transmitted to a server — the MP4 is created locally and stays in your hands until you decide to share it.
Can I convert large 4K MOV files from my iPhone?
Yes. Offcloud imposes no file-size limit, because there is no server involved — the ceiling is your phone or computer's RAM, not some upload quota. Long 4K recordings simply take more time to process.
Is there a watermark or hidden cost?
Neither. Offcloud is completely free, with no signup, no account, and no watermark stamped on your video — the MP4 you download is simply yours to share.