What's the difference between resizing and cropping an image?
Resizing shrinks (or enlarges) the whole image proportionally: enter a target width, and the height is calculated automatically so nothing gets stretched or squashed — nothing is removed from the frame. If you instead need every image to fit a specific frame (say, a square grid or a 16:9 banner), that means cutting part of the picture away, which is what the crop tool does. Many workflows need both: crop to the right ratio first, then resize to the exact pixel dimensions a platform expects.
Why can I only set a target width, not both width and height?
Locking to a single target width (with height following automatically) is deliberate — it's the one input that can't accidentally distort a photo. Typing both a width and a height that don't match the original aspect ratio is exactly how images end up looking squashed or stretched, which is a common mistake with resize tools that let you set both independently.
What's a good image width for websites?
Web content images are commonly resized to somewhere in the 1200–1600px width range — large enough to look sharp on modern screens, small enough to load fast. Thumbnails for listings or galleries are often resized much smaller (300–600px), then compressed further on top of that.