Resize image

Resize image: uses and practical guidance

Resizing an image changes its pixel width and height for a specific use. It helps when a form requires dimensions, a photograph needs to fit a web page or a screenshot occupies too much space. Start by inspecting the original dimensions and the destination requirements. Pixel size and file size are different measurements: an image with modest dimensions can still contain many bytes if its encoding is inefficient for the content.

Keeping the aspect ratio prevents faces, logos and objects from stretching. Changing one dimension adjusts the other to retain the original relationship. When a destination requires a different shape, such as a square from a landscape photograph, crop the composition first and resize afterwards. Disabling proportional sizing to force both numbers can distort the content even when the output technically matches the requested width and height.

Enlarging cannot recover detail absent from the source. Use an image with sufficient resolution for a large header and inspect small lettering at its final display size. Reducing dimensions may suit a screen, but retain a larger original if printing is also required. Repeated processing in lossy formats can accumulate defects, so return to the source when preparing versions for different destinations instead of repeatedly resizing an already edited copy.

Open the download and verify width, height and visual proportions. Continue with Compress image when byte size is the main problem, comparing the actual output size. Crop image is appropriate before setting final dimensions when a different region is needed. Record the intended use alongside the dimensions so a thumbnail version is not mistaken for an image intended to be displayed at full size.

A practical check before using the result

For a thumbnail, compare a proportional version with the actual publication space. If margins remain, decide whether cropping is appropriate instead of stretching. Inspect a face, circle or logo to detect distortion quickly. Verify downloaded dimensions and check whether the destination applies another automatic crop. An image can look correct before upload yet lose part of its composition afterwards. Keep a high resolution source and measurements for each version so they can be rebuilt when the design changes. Choose pixel dimensions for the intended use without discarding detail needed by a larger delivery. Inspect both the local export and its final placement before approving the result.