MOV is what iPhones and QuickTime record, but many Windows programs, editors and upload forms prefer MP4. Converting keeps the video and makes it play everywhere.
Where the video inside is already H.264 — as most iPhone recordings are — the streams are copied rather than re-encoded, which is fast and lossless.
The conversion runs on your device, so a personal recording is never uploaded just to change its container. Large videos are limited by your device memory, so a phone handles short clips best.
How to use it
Add the MOV file from your iPhone or QuickTime.
Press Convert — iPhone footage is usually already H.264, so the streams are copied rather than re-encoded.
Download the MP4.
Supported formats and limits
Input
MOV (iPhone, QuickTime)
Output
MP4
Speed
Very fast when the streams can be copied
Quality
Unchanged in the copy case
Limits
Warned above 500 MB, stopped above 1.5 GB
Where it runs
In your browser; nothing uploaded
Not for: Very long recordings on a phone — browser memory is the limit, so a desktop is better for those.
Frequently asked questions
Are my files uploaded to a server?
No. This conversion runs entirely inside your browser using your own device’s processing power. The file never leaves your computer or phone, which is why it also works when your connection drops.
Will I lose quality?
Not when the streams can be copied, which is the common case for iPhone footage. If a re-encode is needed the default settings keep the difference hard to see.
How large a video can I convert?
You are warned above 500 MB and stopped above 1.5 GB, because the browser cannot hold more in memory. Long recordings are better handled by desktop software.