Bulk Image Resizer
Resize one image or batch-resize multiple images at once. Set exact dimensions or pick a preset — download individually or as a ZIP.
Written by Anil Gautam · Updated
How does the aspect ratio lock work?
With a single image loaded, the width and height boxes start at the original size and Lock aspect ratio is ticked. Typing a new width recalculates the height as width x original height / original width, rounded to the nearest pixel, and typing a height works the same way in reverse. A 4000 x 3000 photo set to 1200 wide becomes 1200 x 900, and a 3024 x 4032 phone portrait set to 1080 wide becomes 1080 x 1440.
Presets work differently. Clicking one unticks the lock and applies its exact size, so a 4000 x 3000 photo sent to Instagram Post (1080 x 1080) is squeezed: its width shrinks to 27% of the original and its height to 36%, and faces look narrow. Neither mode crops. For a square crop without distortion, Profile Picture Cropper has a 1080 x 1080 square option.
What does Fit within do when resizing in bulk?
Loading two or more images opens bulk mode, set to 1080 x 1080 with Fit within unticked, so every image is stretched to exactly that size. With Fit within ticked, each image is scaled by whichever is smaller: target width / original width or target height / original height. A 4000 x 3000 landscape becomes 1080 x 810, a 3000 x 4000 portrait becomes 810 x 1080, and the New Size column shows these figures before you press Resize All.
Small images are enlarged as well, so an 800 x 600 picture scales by 1.35 to 1080 x 810 and looks softer. Results are named after the original, with holiday.jpg saved as resized-holiday.png, and Download All as ZIP produces resized-images-1080x1080.zip, named after the target box. The ZIP library is fetched from a public CDN on first use; if that fails, the files download one at a time. Your images stay in the browser throughout.
Why is my resized image bigger in KB than the original?
Every result is saved as PNG, whatever the input format. PNG is lossless, so a photo that arrived as a compact JPG can leave as a heavier PNG even with fewer pixels. If file size matters, run the results through PNG to JPG Converter or PNG to WebP Converter, or use Compress Image to 200KB when a form sets a KB limit.
The Passport (US) preset is 600 x 600, which prints at 2 x 2 inches at 300 DPI. For 35x45 mm photos and a printable sheet, Passport Photo Maker is the better fit.