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How to use Image Resizer

Resizing changes the number of pixels in an image. Reducing dimensions is useful for web pages, email, and thumbnails, while enlargement cannot recreate genuine missing detail.

Choose an image and note its original dimensions.
Enter the required width or height and keep the aspect ratio locked unless intentional stretching is needed.
Preview the resized image and download it in the selected format.

Practical example

A 4000 pixel phone photo can be reduced to 1200 pixels wide before it is placed in an article.

Useful tips

Resize from the highest-quality original.
Keep the aspect ratio locked for photographs.
Judge sharpness at the image's intended display size.

Limitations

Upscaling creates additional pixels through interpolation but cannot reveal detail that was not present in the source.