FileDial › Guides › File formats explained
MP4 vs MOV: what is the difference?
By Himanshu Ranjan · Updated 8 November 2026
Both are containers that hold video and audio, and MP4 was built on Apple's QuickTime format that MOV uses. They can carry the same codecs, so quality is not the main difference. MP4 is an international standard that more players and devices read, while MOV suits Apple editing workflows. Convert to MP4 to share, keep MOV to edit.
They are containers, not codecs
A video file is a container wrapping compressed video and audio streams. MP4 and MOV are containers. The codec inside, such as H.264 or HEVC, decides most of the quality and size. Wikipedia says both containers can hold the same MPEG-4 audio and video streams, so they are largely interchangeable in a QuickTime-only environment. That is why moving a video from MOV to MP4 can often be done without re-encoding.
Shared history
MP4, formally MPEG-4 Part 14, builds on the ISO base media file format, which derives from Apple's QuickTime File Format. The ISO approved QuickTime as the basis for the MPEG-4 file format. The two stayed close relatives, with small differences; Wikipedia mentions that QuickTime 7 added multichannel audio to the QuickTime format, a discrepancy between them.
Where they differ in practice
The biggest difference is support. Wikipedia says that, as an international standard, MP4 has more support, and that many hardware players, such as DVD players, read MP4 but not the QuickTime format. Windows codec packs commonly include an MP4 parser but not one for QuickTime. In practice, an MP4 plays on more televisions, cars, phones and web platforms.
MOV is common on Apple devices and in Apple editing workflows, and some professional codecs such as ProRes are typically stored in MOV. The MP4 specification defines only the .mp4 extension, with variants such as .m4a for audio-only.
- Sharing, uploads and web: MP4
- Playback on unknown devices: MP4
- Editing in Final Cut or similar: MOV is fine, often preferred
- Apple-only workflows: either works
Converting on a Mac
QuickTime Player can export a video, and Finder Quick Actions can trim and convert some media. For control, FileDial's Convert › Convert to MP4 and Convert › Convert to MOV write a new copy beside the original. For editing, Convert › Editing proxy (ProRes Proxy) makes a light ProRes Proxy MOV for editing apps, and Convert › Editing proxy (H.264 540p) makes a small H.264 MOV that is easy to scrub. If the file is too big, Compress › Compress to 720p can shrink it; a 366 MB 1080p video was compressed to 720p in 23 seconds with 117 MB out, measured on a MacBook.
See the MOV to MP4 guide for the specific steps.
- Select the MOV file in Finder.
- Choose Convert › Convert to MP4 in the dial.
- Check the result card for size and open the new copy to confirm playback.
- Keep the MOV if you may edit it again.
Quality and conversion cautions
Converting between containers while keeping the same codec should not change quality, but re-encoding to a different codec can. If a tool re-encodes, it applies lossy compression again, so avoid converting the same file repeatedly. Keep the original and share the copy.
Mistakes and practical advice
The most common mistake is assuming that renaming a file from .mov to .mp4 converts it. Changing the extension changes nothing inside the file, and a player may still fail if the contents do not suit an MP4 container. Use a real conversion that rewraps or re-encodes the streams.
The second is confusing container and codec. A .mp4 with HEVC video may refuse to play on an older television that handles H.264 happily, while an .mov with H.264 plays fine. When a video will not play, check the codec as well as the extension. If you need the widest reach, H.264 video with AAC audio in an MP4 is the safest combination.
The third is re-encoding when rewrapping would do. Because the two containers share a lineage and can hold the same streams, a tool that copies the streams into a new container keeps quality and is fast. Re-encoding applies lossy compression again, so avoid it unless you need a different codec or a smaller file.
Fourth, editing from compressed footage. Phone video is heavily compressed and can make editing sluggish. For a project, create an editing proxy: FileDial's Convert › Editing proxy (ProRes Proxy) writes a light ProRes Proxy MOV, and Convert › Editing proxy (H.264 540p) writes a small H.264 MOV that is easy to scrub.
Fifth, metadata. Phone video can carry location and device details. Adjust › Remove location & metadata writes a new copy with no re-encoding, which is useful before you post a clip. For audio-only needs, Audio › Extract audio as M4A takes the sound out without touching the original.
Finally, keep an eye on size. If an MP4 is still too large for email or an upload limit, compressing it is a better answer than switching container, since the container barely affects size.
Questions
Is MP4 better quality than MOV?
Not by itself. Both are containers, and quality depends on the codec and settings inside. Wikipedia says the two can carry the same MPEG-4 audio and video streams, so a MOV and an MP4 holding identical streams look identical. Differences appear in compatibility, not picture quality.
Why does my iPhone video not play elsewhere?
It may be a MOV, or it may use a codec the other device lacks, such as HEVC on an older television. MP4 with H.264 video and AAC audio is the most widely playable combination. Converting a copy to MP4 usually solves it, and keeping the original preserves your best version.
Can I change MOV to MP4 without losing quality?
If only the container changes and the streams are copied across, yes, there is no loss. If the tool re-encodes the video, there is a small loss each time. Compare file sizes on the result card: a copy that is nearly identical in size suggests a rewrap rather than a re-encode.
Which should I upload to YouTube?
Most platforms accept both, but MP4 is the safer choice because it plays on the widest range of devices. Check the platform's current upload guidance for supported codecs, maximum size and resolution before you upload a long video, and compress first if needed.