View this video at https://macmost.com/how-to-convert-and-resize-images-on-your-iphone.html. If you need to resize a photo or graphic on your iPhone, or export it into a different format or compression amount, you can now do so with the Preview app in iOS 26. In fact you can resize, crop, markup, compress and save out a file from Photos, an existing image file, or even from other apps or screenshots.