Batch image resizing
Also known as: resize multiple images, bulk resize, resize many photos at once
Batch image resizing changes the pixel dimensions of many images in one operation, applying the same target size, percentage, or fit rule to every file. It saves time and keeps a set of images consistent for the web, email, or upload limits.
- Applies one size rule to many files at once
- Keeps aspect ratio to avoid stretching
- Resizing down discards pixels permanently
How batch resizing works
You set a rule once — a target width, a maximum long edge, or a scale percentage — and it is applied to every selected image. A good resizer keeps the aspect ratio so nothing stretches, and lets you choose whether to enlarge smaller images or leave them untouched.
Resizing down throws away pixels permanently, which is what shrinks the file. Work from copies if you might need the originals at full resolution later.
When to use it
Batch resizing fits any time you have a folder of images that all need the same dimensions: product photos for a store, attachments under an email limit, or assets sized for a page. Pairing a resize with compression shrinks files further without changing dimensions.
Resizing differs from cropping. Resizing scales the whole image; cropping removes part of the frame. Many tools let you do both in the same pass.