Image Size Calculator
Resize image dimensions without distortion — enter the original size, change one dimension, and the other updates to keep the ratio.
Resize images without the squash
Resizing an image to fit a layout means keeping its proportions — change the width and the height has to follow, or the picture stretches. This calculator does that math for you. Enter the original dimensions and it works out the aspect ratio; then set either a new width or a new height and it fills in the matching value instantly, so the resized image stays perfectly proportional.
It's handy for responsive design, thumbnails, social image sizes, and export presets — anywhere you need a smaller
or larger version at the same shape. The scale percentage tells you how much you're shrinking or enlarging. Use the
resulting numbers in your editor, CSS width/height, or export dialog.
Private and instant
The calculation runs entirely in your browser — nothing is uploaded.
Frequently Asked Questions
What does the image size calculator do?
It resizes image dimensions while keeping the aspect ratio locked. Enter the original width and height, then change either target dimension and the other updates automatically so the image never distorts.
Why keep the aspect ratio?
Changing width and height independently stretches or squashes an image. Locking the ratio guarantees the resized image keeps the same proportions and looks correct.
Does this resize the actual image file?
No — it calculates the correct dimensions. Use the numbers in your image editor, CSS, or export settings to resize the real file proportionally.
Is this tool free and private?
Yes. The calculation runs in your browser — nothing is uploaded or stored.
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