Convert files on iPhone, no app install

Just use this page in Safari or Chrome on your iPhone. There is nothing to get from the App Store.

What works well on a phone

Extract audio, trim, change container and subtitle conversion all work the same way in iPhone Safari.

You pick the file the same way you would from Photos.

Safari on iPhone strictly limits how much memory one tab can use. Re-encoding a long, high-resolution clip with Shrink or GIF can close the tab.

For a file like that, trim to the part you need first, or switch to Safari or Chrome on a PC.

Private browsing in Safari does not remember the engine file, so it downloads again each time. A normal window is faster after the first run.