Most distortion comes from one mistake: changing width and height independently. Keep the relationship between the two sides, then decide whether the destination needs fit, fill, or a real crop.
2400 × 1600 and 1200 × 800 are different dimensions but the same 3:2 shape. If the width is cut in half and the height is cut in half too, objects keep their proportions.
Change only one side and the shape changes. A face gets wider, a circle becomes an oval, a product looks unnaturally tall. That is distortion—not a quality problem.
Those shapes do not match. Forcing the original directly into a square by changing width and height independently stretches it.
The exact calculation can be handled by the tool. What matters is that the ratio remains 3:2. If you truly need 1200 × 1200, the problem is no longer “resize only”; you need a framing decision.
Know the current width and height before entering a target.
Turn it off only when distortion is deliberate.
If 16:9 must become 1:1, choose fit, fill or crop rather than stretch.
They reveal distortion faster than many natural textures.
Make sure the destination dimensions are correct and the composition still works.
