Cropping vs resizing — what's the difference
Cropping changes the shape of an image by removing pixels from the edges — turning a wide photo into a square, for example. Resizing changes the dimensions (the pixel count) while keeping the same shape, so a 4,000 px square becomes a 1,080 px square. You usually do both: crop to the right ratio first, then resize to the exact pixel size a platform wants. For those exact pixel targets, see our product image size guide, and to change dimensions use the image resizer.
Which aspect ratio for which platform
Match the shape of your crop to where the image will be shown. This table covers the ratios you will actually use most.
| Platform | Aspect ratio | Shape |
|---|---|---|
| Amazon / marketplaces | 1:1 | Square |
| Instagram feed | 1:1 or 4:5 | Square or portrait |
| Instagram portrait / Pinterest | 4:5 | Portrait |
| Etsy thumbnail | 4:3 | Landscape |
| Stories / Reels / TikTok | 9:16 | Vertical |
| YouTube / banners | 16:9 | Widescreen |
How to crop an image to a square
A 1:1 square is the safest default for Amazon, most marketplaces, and the Instagram feed. Here is how to make one with the free image cropper:
Upload your photo, choose the Square (1:1) ratio, and download. The tool center-crops your image to the largest square it can fit, so keep the subject centered when you shoot and nothing important gets trimmed.
How to crop for portrait and stories
For a taller frame, choose 4:5 in the same image cropper — this is the portrait shape Instagram and Pinterest favor, and it takes up more screen space on mobile. For full-screen Stories, Reels, and TikTok, choose 9:16 instead. Both ratios are ideal for ads and short-form video where a vertical frame commands attention.
Crop first, then resize and pad
The recommended workflow is to crop to the right shape first, then resize to the exact pixels a platform needs. Once your image is the correct ratio, drop it into the resizer to set precise dimensions (and pad to a square background if needed). When you have many images to process at once, the bulk image resizer applies the same size to a whole batch in one pass.
Rule of thumb: shoot a bit wide with the product centered in the frame. When there is spare room around the product, you can crop the same original to any ratio later — square, 4:5, or 9:16 — without ever cutting into the product itself.
Does cropping reduce quality?
No. Cropping only removes pixels from the edges — it does not rescale the pixels that remain, so the part of the image you keep stays exactly as sharp as it was. As long as you start from a high-resolution original, a cropped square or portrait will look just as crisp as the source. Quality only drops when you crop a small image so tightly that too few pixels are left, so always begin with the largest file you have.