Compress a video on your iPhone without installing an app. Open this page in Safari, pick a clip from your library and get a smaller MP4, with no upload.
An iPhone records in high resolution, often 4K, and saves the clip as a MOV file. A few minutes of footage can reach several hundred megabytes, which is too much for most messaging apps and email. Compressing re-encodes the clip at a lower bitrate and saves it as an MP4 that plays on almost any device.
A phone has less memory than a computer, so keep the page open and avoid switching apps while it works. VimCut warns you earlier on devices with little memory, so a very long 4K clip may be better handled on a computer, or trimmed first with Trim Video. To fit a chat app, try Compress for WhatsApp, and for general use see the video compressor.
No. It works in the browser, so you only need Safari or another modern mobile browser.
It is downloaded as a file. On an iPhone you can find it in the Files app or save it from the share sheet.
No. It is processed on your phone and never leaves it.
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