Choose crop or fit before resizing
Crop-to-fill is best when the subject can safely lose the outer edges. It enlarges the image until the square is covered, then trims the overflow around the center.
Fit-with-background is better for logos, document scans, product photos, and anything where the complete image must remain visible. The full image is scaled into the square and the empty space is filled with a chosen background color.
Avoid stretching width and height independently. It may produce a technically valid 200x200 file, but faces, circles, logos, and text can look visibly wrong.
Check the generated file, not just the settings
A good exact-size tool should read the output dimensions after processing. That catches browser decoding problems, orientation surprises from phone photos, and accidental settings changes.
File size in KB is separate from pixel size. A 200x200 PNG, JPG, and WebP can all have the same dimensions but very different download sizes.
Keep the file local
Browser-local resizing uses the selected file inside the current tab, draws the result onto a canvas, and creates a temporary download link. The server sends the tool, but it does not need the selected image to make the result.
For sensitive images, clear the browser Network panel before processing. The output should be a local blob URL rather than a response from an upload endpoint.