Convert MOV to MP4 Online (iPhone & QuickTime)

xFormat converts MOV videos from iPhone, iPad and QuickTime to MP4 in your browser, and can turn iPhone HEVC video into H.264 that plays everywhere, so nothing is uploaded.

Runs in your browser — files never leave your device.

How it works

iPhone videos often show a black screen or only sound on Windows PCs, Android phones and TVs. The usual cause is not the .mov file type but the HEVC (H.265) codec inside it. This converter lets you choose: convert the video to H.264 so it plays on any device, or keep HEVC and just repackage it as MP4 in seconds. Nothing is uploaded either way.

1
Choose the MOV file from your phone, Mac or PC.
2
If the video is HEVC, pick "Convert to H.264" (plays everywhere) or "Keep HEVC" (fast, no quality loss).
3
Tap Convert and save the MP4 to your device.

Why iPhone videos misbehave outside Apple devices

MOV is Apple's QuickTime container. It is closely related to MP4, and both can carry H.264 or HEVC video with AAC audio. Some apps and upload forms simply reject the .mov extension; for those, repackaging the same streams as MP4 is enough.

The bigger problem is the codec. Since iOS 11, iPhones record in HEVC (H.265) by default to save space. Many Windows PCs without the HEVC extension, older Android phones, smart TVs and websites cannot decode it, so they play the sound with a black picture or refuse the file. Changing MOV to MP4 alone does not fix that, because the video stays HEVC.

Convert to H.264 or keep HEVC?

When the converter detects HEVC video, it shows two options. "Convert to H.264" re-encodes the picture into the codec every phone, computer, TV and website can play. It is selected by default on this page because it is what fixes playback problems. It takes longer, and the file is usually a little larger than the HEVC original.

"Keep HEVC" copies the video as it is into an MP4 file: it is done in seconds with no quality loss, which is ideal when the other device already plays HEVC and only the .mov extension was the problem. The line under the file info always tells you which of the two will happen before you start. Audio in AAC is copied untouched in both cases.

HDR clips from recent iPhones are converted to standard 8-bit H.264 for compatibility. They play everywhere, but colours can look slightly flatter than on the iPhone. To avoid conversions in the future, set iPhone Settings > Camera > Formats > Most Compatible, which records H.264 from the start.

Size and speed

Keeping HEVC is about as fast as copying the file. Converting to H.264 is slower and depends on your device: a one-minute 1080p clip takes from several seconds to a minute or two. Keep clips under about 200 MB on a phone and about 500 MB on a computer.

Frequently asked questions

How do I convert an iPhone video to MP4?

Open this page in Safari or Chrome on your phone, choose the video from your library and tap Convert. If the video is HEVC, "Convert to H.264" is preselected so the MP4 plays everywhere. The file is processed on the phone itself and never uploaded.

Will I lose quality converting MOV to MP4?

Not with "Keep HEVC" or when the video is already H.264, because the video is copied without re-encoding. Converting HEVC to H.264 re-encodes the picture, which costs a small, usually invisible amount of quality.

Why won't my iPhone video play on Windows?

Usually because it is HEVC (H.265) and the PC has no HEVC decoder, so you get sound with a black screen. Convert it with "Convert to H.264" selected and the MP4 will play in any player.

Is there a size limit?

There is no server limit, but browser memory is the constraint: roughly 500 MB on desktop and 200 MB on phones is a safe ceiling.

Does it work offline or without an account?

No account is needed and nothing is uploaded. After the page loads, ordinary conversions run locally without further network use.