MOV to MP4 Converter
Processed locally in your browser — nothing is uploaded.
Quick answer
MOV is Apple’s QuickTime container, the format your iPhone records in; MP4 is the universal one Windows and everything else prefer. Because both usually hold the same H.264 video, converting is often a quick re-mux — the picture is copied into an MP4 wrapper rather than re-encoded. It runs in your browser with ffmpeg.wasm, so nothing is uploaded; the engine downloads once (~10 MB) on first use.
How to mov to mp4 converter
Add your MOV
Drop a .mov file from your iPhone or Mac onto the drop zone, or browse for it. The tool inspects the actual codec inside.
Convert to MP4
When the video is already H.264, the stream is re-muxed straight into an MP4 — fast and lossless. Other codecs (like ProRes) are re-encoded to H.264.
Download the MP4
Save the .mp4, ready for Windows, Android, editors and uploads that would rather not deal with QuickTime.
What is the real difference between MOV and MP4?
Less than you might think. MOV is Apple’s QuickTime container and MP4 is the ISO standard container, but MP4 was actually derived from the QuickTime format — they are close relatives. Crucially, both commonly hold the same H.264 video and AAC audio. So a typical iPhone MOV and a typical MP4 differ mainly in their wrapper, not their contents. That is why the conversion is usually so cheap: there is nothing to re-encode, only a container to swap.
| Aspect | MOV (QuickTime) | MP4 |
|---|---|---|
| Origin | Apple QuickTime | ISO standard (from QuickTime) |
| Typical codec | H.264 / HEVC / ProRes | H.264 / HEVC |
| Apple devices | Native | Native |
| Windows & Android | Works, less consistent | Universal |
| Editing (ProRes) | Yes | Not typically |
Why does my iPhone video cause trouble on Windows?
iPhones record to .mov, and sometimes with Apple’s HEVC (H.265) codec to save space. Windows and many web uploaders handle plain H.264 MP4 flawlessly but stumble on QuickTime MOV or HEVC — hence the black screen, the audio-only playback, or the "unsupported format" message. Converting to an H.264 MP4 removes both obstacles at once, giving you a file that opens on a PC, imports into editors and uploads without complaint.
How fast is it, and how large a MOV can I convert?
When the conversion is a re-mux, it is nearly instant even for a large file, because no frames are recompressed. A ProRes or HEVC source that must be re-encoded is slower — the engine is ffmpeg.wasm running single-threaded in the tab, without the multi-core and GPU acceleration of a desktop app. The whole file also lives in browser memory, so a very long 4K recording can be heavy. For big clips, consider trimming or compressing first.
Are my iPhone videos uploaded anywhere?
No. The whole conversion happens on your device in WebAssembly, and your MOV is never transmitted — no cloud, no server, no upload wait. You can prove it in DevTools → Network: apart from the one-time engine download, converting sends nothing out. Personal footage from your phone stays on your phone’s side of the screen.
Related video tools
Have other formats to convert? MKV to MP4 and AVI to MP4 work the same way, and the universal video converter handles any pair. After converting you can compress the MP4 for email, add subtitles, or extract the audio as MP3.
Your files never leave your device
Processed locally in your browser — nothing is uploaded. You can verify it yourself: open your browser’s developer tools, watch the Network tab, and use the tool — no upload request is ever made.
Frequently asked questions
Is converting MOV to MP4 lossless?
Usually, yes. When the MOV already contains H.264, the video is copied straight into the MP4 container without re-encoding, so quality is identical. Only codecs like ProRes or HEVC that need converting are re-encoded.
Why will not my iPhone MOV play on Windows?
iPhones record QuickTime MOV, sometimes in HEVC, which Windows and many uploaders handle inconsistently. Converting to an H.264 MP4 produces a file Windows plays and imports without extra codecs.
Will the MP4 look the same as my MOV?
Yes when it is a re-mux, since the picture data is untouched. Even when a re-encode is needed, the difference at a matching bitrate is not visible in normal viewing.
Does this handle HEVC / H.265 iPhone video?
Yes. HEVC video is re-encoded to H.264 during conversion so the resulting MP4 plays on devices and apps that do not support H.265. This takes longer than a plain re-mux.
Why is a ProRes MOV slow to convert?
ProRes is an editing codec MP4 does not carry, so the video must be fully re-encoded to H.264. That is real compute, and the engine runs single-threaded in the browser, so expect it to take a while.
Can I convert a long 4K iPhone video?
You can, but large 4K files are processed in browser memory and may strain the tab. Trimming or compressing first makes long recordings convert more reliably.
Is my file uploaded to convert it?
No. The conversion runs entirely in your browser. Confirm there is no upload in the Network tab of your developer tools.