How to convert MOV to MP4
MOV plays fine on Apple devices but not everywhere else. Here is how to convert it on a Mac and on Windows.
Why a MOV won't play somewhere else
MOV is Apple's QuickTime container format: the default for iPhone recordings, Mac screen recordings and FaceTime footage. It usually holds the same H.264 or HEVC video that MP4 does, but some Windows apps, older TVs, video editors and web uploaders only recognise the MP4 wrapper, and a few reject a MOV outright with no explanation. Converting the container to MP4, not necessarily the video itself, is normally all it takes.
On a Mac
QuickTime Player can do this directly: open the MOV file, then File, Export As, and choose a resolution (1080p, 720p, etc). QuickTime saves the export as an .mp4 file. This does re-encode the video, so it takes roughly as long as the clip itself and can lose a very small amount of quality.
On Windows
Clipchamp, preinstalled on Windows 11, opens a MOV file directly: import it, add it to the timeline, and export, which produces an MP4 by default. Older MOV files using less common codecs sometimes fail to import in Windows' own apps; that is the case where a browser tool that reads the file itself, rather than relying on Windows' installed codecs, is more reliable.
On an iPhone
The Shortcuts app has a Convert Media action that can output MP4: create a shortcut with Select Photos followed by Convert Media set to MP4, then run it on the video. This is mainly useful for sending a video to something that insists on MP4 before it will even accept the file.
Converting without re-encoding when possible
Since most MOV files already contain H.264 video, Stayput's video to MP4 converter (and the dedicated MOV to MP4 page) checks first: if the video is already H.264, it repackages the container in seconds with no quality loss and no re-encoding at all; only HEVC or other codecs get re-encoded. Everything happens in your browser tab, so a private video is never uploaded, and the size limit is your device’s memory (phones hold less).
Questions
Is MOV the same video as MP4, just renamed?
Often, yes, when the video inside is H.264: the two are different containers around the same kind of data, so a straight repackage with no quality loss is possible. A MOV using HEVC or another codec needs an actual re-encode.
Why does my MOV file look huge compared to an MP4 of the same video?
File size comes mainly from the video codec and bitrate inside, not the container, so a MOV and MP4 with the same codec and settings are close in size. A large MOV is more often about how it was recorded than the container format.
Can I convert MOV to MP4 without losing quality?
Yes, when the source is already H.264, a container-only conversion changes nothing about the video data. Re-encoding to a different codec always carries some quality trade-off.
Do I need Handbrake or another app to convert MOV to MP4?
Not for a quick conversion. QuickTime Player (Mac), Clipchamp (Windows) or a browser tool cover most cases without installing dedicated software.