MOV to MP4: Why Your iPhone Video Won't Play (and How to Fix It)

You AirDropped a clip to a Windows laptop, or tried to upload it to a website, and got a cryptic "unsupported format" error. The culprit is almost always the same: iPhones record video in Apple's QuickTime .MOV container, and depending on the codec inside it (often HEVC/H.265), a lot of non-Apple software simply doesn't know what to do with it.

Is MOV broken, or just less universal?

MOV is a perfectly valid, high-quality video container. The problem is compatibility: MP4 with H.264 video and AAC audio is the closest thing to a universal video standard, supported by essentially every browser, phone, editing tool, and social platform on earth. MOV files, especially ones using the newer HEVC codec for smaller file sizes, aren't guaranteed to work everywhere.

When does this problem actually happen?

Common triggers include uploading to a CMS or ad platform that only accepts MP4, sending a file to a Windows or Android user whose media player doesn't have an HEVC decoder installed, or importing footage into older editing software. If a video plays fine on your iPhone but fails everywhere else, format is almost always the cause.

How do I convert MOV to MP4 in my browser?

You don't need to install anything. VimCut's convert-to-MP4 tool reads your MOV file, re-encodes the video to H.264 and the audio to AAC, and gives you back a standard .mp4 file — all inside your browser tab, so the original file never leaves your device. It typically takes a few seconds per minute of footage, depending on your device.

Tip: convert before you trim, not after

If you're planning to trim or edit the clip too, it's usually faster to convert to MP4 first, then run additional edits on the converted file — most browser-based and mobile editing tools are noticeably snappier with H.264 MP4 source material than with HEVC MOV.