Crop an Image to Exact Pixels Without Distortion

Cropping keeps a rectangle from an image. Resizing changes the dimensions of that rectangle. If a form wants a 600 × 600 image, a square crop followed by resizing usually preserves the subject better than stretching a rectangular photo into a square.

Understand the four crop values

X is the horizontal distance from the left edge to the crop’s starting point. Y is the distance down from the top. Width and height describe the rectangle you keep. These are source-image pixels, so the result does not depend on how large the browser preview looks.

Set the crop and inspect the boundaries

1. Open Crop Image and choose your original file.
2. Enter X, Y, width and height. Keep X + width within the original width, and Y + height within the original height.
3. Inspect the preview around the subject’s head, hands, product edges or document text. Adjust the position without changing the required ratio.
4. Download the crop. Use Image Resizer if the final required dimensions differ from the crop size.

Do not use the browser’s displayed preview size as proof of the saved dimensions. Reopen the download and check its pixel properties. A high-resolution photo can be displayed in a small preview without being resized.

Choose crop or resize based on the requirement

A width-only requirement usually calls for proportional resizing. An exact width and height calls for the correct aspect ratio first. If all edges must remain visible, such as a diagram or a scanned document, add padding in an editor rather than cropping essential content.

A photo upload may also specify background, head size, file type and byte limit. Pixel dimensions address only one requirement. Follow the receiving service’s instructions; a square image is not automatically a valid identity photo.

Avoid unnecessary loss

Work from the original once, crop once and resize once. Saving the same JPEG repeatedly can add compression artifacts around sharp edges. PNG suits line art and transparency; JPEG often suits photographs. Increasing the dimensions of a small image cannot recreate detail it never contained.

If a crop looks softer, compare both images at the same display scale. The viewer may be enlarging the smaller crop to fill the screen. Check sharpness at 100% and look closely at text, eyelashes or product labels before submitting.

Sources and checks

Cropping selects the area to keep; resizing changes pixel dimensions. Check the saved width and height after both operations. Apple: cropping and resizing images.

Frequently asked questions

What if the crop extends beyond the image?

Move its origin inward or reduce its dimensions. A valid crop must fit completely within the source image.

Does changing DPI make a 600-pixel photo larger?

DPI describes a relationship to printed size. It does not add image detail or substitute for the pixel dimensions required by an upload form.

Can cropping remove a background?

It removes rectangular edges. It does not cut around a person or make the remaining background transparent.

Before you finish

Use the checks above on the saved result before replacing your original.