CONVERT
MOV → MP4

MP4 is the most universally compatible video format. While MOV works well in the Apple ecosystem, MP4 is supported by virtually every device, browser, and media player.

Usually no. MOV and MP4 are sibling container formats based on the same ISO base media spec; most iPhone MOVs already use H.264 or H.265 video and AAC audio, so we simply rewrap the streams into an MP4 container with no re-encoding. That means bit-identical output. Only legacy MOVs with ProRes or Apple Intermediate video require transcoding.

If the MOV contains H.264 video, no — we stream-copy without re-encoding, so the MP4 is bit-identical at the video stream level. For ProRes or other codecs that need transcoding to H.264, a small generational loss occurs.

KaijuConverter uses high-quality H.264 encoding by default, so quality loss is minimal and usually imperceptible. You can also choose a higher quality preset if needed.

It is tempting to try, but renaming alone usually does not work — MOVs can use codecs or metadata structures that MP4 does not recognise. Proper conversion rebuilds the container and updates the index so every player parses the file correctly. KaijuConverter does this without re-encoding wherever possible.

Nearly instant for H.264 MOVs (stream-copy), since no actual video re-encoding happens. ProRes MOVs take real encoding time proportional to duration — typically 0.5-1× realtime.

Yes, free users can convert videos up to 100 MB. For larger files such as 4K recordings, premium plans support files up to 2 GB.

Yes, as long as the source uses H.265 (HEVC). iPhone HDR uses the Hybrid Log Gamma and Dolby Vision profiles wrapped around HEVC; the MP4 container supports both. If you force an H.264 output we fall back to 8-bit SDR, which plays wider but loses highlight detail.

Yes. iPhone MOV files use H.264 or HEVC and both convert cleanly to MP4. HEVC can be stream-copied too (modern MP4 supports HEVC) or transcoded to H.264 for older player compatibility.

With stream copy, a one-minute 1080p video finishes in about five seconds. A twenty-minute 4K video finishes in under a minute. Transcoding (ProRes → H.264) is slower — roughly real-time — because the video must be decoded and re-encoded frame by frame.

Yes. KaijuConverter runs entirely in the cloud so nothing needs to be installed on your machine. QuickTime is not available on Windows anymore and is not required on macOS for the conversion — FFmpeg in our server handles it end to end.

Yes. Container-level metadata such as capture date, GPS location, device model and orientation is copied across. In-video metadata tracks (gyroscope, stabilisation vectors) are preserved when the target MP4 supports them — HandBrake or DaVinci can use them for post-production stabilisation.