Lock the source aspect ratio for proportional resizing. Use crop when the destination ratio differs, or contain when every source pixel must remain visible.
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Resize an image precisely
Change pixels, not just file size. Lock the aspect ratio or set an exact canvas and output format.
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Protect the aspect ratio
Aspect ratio is width divided by height. Changing only one dimension while calculating the other keeps circles round and faces natural. Stretching to two unrelated dimensions changes the shape of every object.
Choose between cover and contain
Cover fills the destination and crops overflow. Contain keeps the complete image and adds empty background when the ratios differ. Fit inside resizes to stay within both limits without enlarging unnecessarily.
Check the final crop at full size
Automatic center crops can cut off a face, signature, or label near an edge. Preview the result and use explicit crop coordinates when composition matters.