Rewrap iPhone and QuickTime MOV videos as MP4 in seconds, or re-encode ProRes and HEVC when a device needs H.264. Nothing is uploaded, and there’s no account, watermark or limit.
Drop your MOV files where the page says “Drop MOV files here”, or tap to pick them. Each row shows the length and picture size, plus the plan for that file, for example “Fast: copied into MP4 without re-encoding”.
If the MP4 is meant for a Windows PC, a TV or a video editor, tick “Maximum compatibility (convert HEVC to H.264)”. Leave it unticked to keep an iPhone's HEVC video exactly as recorded.
Press “Convert 1 video to MP4” (the number follows how many files you added) and watch each row's progress.
Save each result with Download, or grab everything at once with “Download all (.zip)”.
MOV is the QuickTime File Format that Apple introduced with QuickTime in 1991. When MPEG standardised a container for MPEG-4, it based the ISO base media file format on QuickTime's structure, and MP4 is built on that. The two are siblings: both store media in the same kind of nested boxes (Apple calls them atoms), and both can hold H.264 or HEVC video with AAC sound.
Because of that kinship, most MOV files never need re-encoding. iPhones record HEVC (High Efficiency) or H.264 (Most Compatible) with AAC audio; filetidy lifts those streams out of the MOV and writes them into a fresh MP4 untouched. That is a remux: it finishes in seconds even for long clips, the picture is identical and the size barely changes.
Re-encoding happens only when the video codec doesn't belong in a widely playable MP4. The usual case is Apple ProRes, the editing codec used by Final Cut Pro exports, many cameras and recorders, and iPhone Pro models when ProRes is turned on. ProRes often runs well over 100 Mbit/s, so the H.264 version (about 6 Mbit/s for 1080p at 30 fps) is commonly a tenth of the size or less. Uncompressed PCM sound from cameras or screen recorders is turned into AAC.
The Maximum compatibility checkbox decides what happens to HEVC. Unticked, HEVC is copied: instant and lossless, fine for Macs, iPhones and recent Android phones. Ticked, HEVC is re-encoded to H.264, which older Windows PCs, many TVs and some editing apps need. Location and other tags the iPhone writes are not copied to the MP4.
iPhone & iPad
“Most Compatible” also makes photos JPEG instead of HEIC, and files take more space. Some modes, such as 4K at 60 fps, need “High Efficiency”.
Mac
iMovie re-encodes the whole clip, so it takes longer than a copy. QuickTime Player's File > Export As writes another .mov, not an MP4.
Windows
If the MOV is HEVC and Windows shows a black picture or an error, the PC lacks an HEVC decoder (Microsoft sells HEVC Video Extensions in the Microsoft Store). Converting here with “Maximum compatibility” avoids that.
Leave it off when the MP4 will be watched on an iPhone, iPad, Mac, a recent Android phone or uploaded to a big video platform. HEVC is copied bit for bit, the conversion takes seconds and the file stays smaller than an H.264 copy of the same quality would be.
Tick it when the file is going to a Windows PC without HEVC support, an older smart TV, a projector, a car screen, or an editing app that refuses HEVC. The picture is re-encoded once to H.264, so the job is slower and the file usually grows, but it will open nearly everywhere.
If your MOV is already H.264 (iPhone set to Most Compatible, most screen recordings and many camera exports), the checkbox changes nothing: the video is always copied. ProRes is always re-encoded whatever you choose.
Yes. Your video was H.264 or HEVC, which MP4 can hold as is, so filetidy moved the existing frames into a new MP4 container without decoding them. Nothing was recompressed, which is why it is fast and the quality is identical to the original.
Sometimes a renamed file plays, because the two formats are built the same way, but it is still a QuickTime file inside and strict players, TVs or upload forms may reject it, especially when it has QuickTime-only tracks or PCM sound. A remux writes a genuine MP4 with the index at the front, which is just as fast and always correct.
Much less. ProRes stores each frame with very little compression so editors can cut it smoothly. filetidy re-encodes it to H.264 at about 0.1 bit per pixel per frame, capped at 12 Mbit/s, keeping the resolution and frame rate, so the MP4 is often 90% smaller or more. Expect it to take longer than a copy, and keep the ProRes master for editing.
Not when the row says “Fast: copied into MP4 without re-encoding”: the video is the very same data. Quality only changes when the plan says the video will be re-encoded, as with ProRes or HEVC with Maximum compatibility ticked; at the bitrates used, the difference is hard to see on normal screens.
Since iOS 11, iPhones record in HEVC by default, and Windows can only decode HEVC with an add-on from the Microsoft Store or suitable hardware support. Converting with Maximum compatibility ticked gives an H.264 MP4 that Windows plays without anything extra.
The main sound track is kept: AAC is copied untouched, other audio such as PCM becomes AAC. The location and other descriptive tags the iPhone stores in the MOV are deliberately left out of the MP4, so you can share it without revealing where it was filmed.
No. The MOV is read and rewritten by your browser on your own device. When re-encoding is needed and your browser can't do it natively, a one-time 32 MB compatibility encoder is downloaded, but your video itself never leaves the device.
Last updated October 28, 2026
iPhone videos are often HEVC. Copying is instant, but some Windows PCs, TVs and editors can't play HEVC.