Cropping is the one edit that improves almost every photograph, and the one most people skip. It is also the fastest way to make a file smaller without touching quality at all: cutting half the frame away removes half the pixels, and half the pixels is roughly half the bytes. Drag a rectangle over the part you want, or pick a shape — square, portrait, widescreen — and drag that instead.
One at a time, because a rectangle drawn on one photograph means nothing on another.
Or choose a shape first and move it around. The area outside dims so you can see what you are keeping.
The crop is applied when you save, not while you are still deciding.
Step by step, with screenshots: How to crop an image
No. The pixels you keep are the pixels you had — a crop removes area rather than degrading anything. That makes it the cheapest possible way to shrink a file: no compression trade-off, no visible cost, just less picture.
Because a rectangle is chosen against a particular photograph. Twenty pictures are twenty different compositions, and applying one rectangle to all of them would cut the subject out of most. Cropping a set to a common SHAPE is a different job, and the shape presets are the tool for it.
Choose the shape you need, drag the rectangle, then set the width afterwards — the two controls together give an exact result. Cropping first and resizing second is also the right order: it means the resize is working on the part you kept.
It is shown the way your phone intended, because the orientation recorded by the camera is honoured before anything is drawn. What you drag the rectangle over is what you get.
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