MOV to MP4 converter

How to use the mov to mp4 converter

1. 01Choose your MOV file, or drop it onto the box.
2. 02Check the plan line: it says whether the file will convert without re-encoding, will re-encode to H.264 (and AAC for any sound), or will become a WebM file because your browser can't create MP4.
3. 03Click Convert to MP4.
4. 04Download the finished MP4.

Why MOV to MP4 is often instant

MOV and MP4 are close relatives at the container level: MP4 is based on the ISO base media file format, a structure that itself grew out of Apple's own QuickTime format, which is what MOV is. That shared ancestry means the two containers can hold exactly the same kinds of encoded video and audio streams, so converting one into the other is very often a matter of moving those streams across rather than re-encoding them.

When your MOV file already contains H.264 or HEVC video with AAC or MP3 audio, both codecs MP4 can hold directly, converting it is a remux: the compressed streams are copied into a new MP4 container without being decoded and recompressed. That is why the plan line above the Convert button so often reads "without re-encoding" for a MOV file, and why the conversion finishes in moments rather than minutes.

The only work being done in that case is repackaging: writing a new container structure around data that does not itself change, which is also why the result keeps the source's original quality exactly, with nothing lost in the process.

iPhone videos and HEVC

Video recorded on an iPhone is saved inside a MOV container, and since iOS 11, Apple's Camera app has defaulted to HEVC (H.265) for the video track when the High Efficiency setting is on, rather than the older H.264. (Verified against Apple's own guidance on HEIF and HEVC media, support.apple.com/en-us/116944, 22 September 2026.)

HEVC is one of the two video codecs MP4 can hold directly, so an iPhone MOV recorded with High Efficiency on will usually convert to MP4 without re-encoding, the same as an H.264 source would. If your iPhone is instead set to Settings > Camera > Formats > Most Compatible, it records H.264 video in a MOV container already, which converts to MP4 the same way.

Either setting converts cleanly; what changes between them is only which specific video codec ends up inside the MP4, not whether the conversion can skip re-encoding.

When the MP4 won't play

An MP4 that plays in one place and not another is almost always a codec problem hiding inside a container that opens everywhere: the file itself is valid MP4, but whatever is decoding it does not support the specific video or audio codec inside. This tool avoids that outcome by re-encoding to H.264 and AAC, or to WebM when your browser cannot produce H.264, whenever the source codec is not one MP4 was built around.

If a converted file still will not open somewhere, check that the app or platform in question actually claims support for the exact codec, not just the .mp4 extension. It is also worth reopening the source MOV separately to confirm it plays at all: a file that has already been partially corrupted before conversion carries that fault straight through into the new container.

Re-downloading the converted file, rather than reopening a browser tab that has moved on to something else, is worth trying first: an interrupted or partial download can leave a file that opens the container correctly but fails partway through playback.

Questions about the mov to mp4 converter

Is converting MOV to MP4 lossless?

When your MOV file's video is H.264 or HEVC and its audio is AAC or MP3, yes: the codecs are copied into the new MP4 container without being re-encoded, so nothing about the actual picture or sound data changes. If the codecs inside your MOV are not ones MP4 can hold directly, the file has to be re-encoded instead, which is a lossy step like any other and needs your browser to decode those codecs; if it cannot, the converter says so before you start.

Does this work with iPhone videos?

Yes. iPhone videos are recorded inside a MOV container with either HEVC or H.264 video, both of which MP4 can hold directly, so converting one to MP4 is typically a fast conversion without re-encoding.

Is there a file size limit?

Files above 2 GB carry a warning that conversion may be slow and use a lot of memory; files above 4 GB are refused, since that is more than a browser can safely process.

Is my video uploaded?

No. The whole conversion runs in your browser; your MOV file, and the MP4 it becomes, never leave your device.

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Updated 22 September 2026 · All free tools