Image Resize Calculator
Calculate new dimensions and export a resized image without stretching it. Your selected image is processed locally in this browser; it is not uploaded to RatioCalc.
1. Choose an image
For reliable performance, use an image under 40 megapixels. Animated images are processed as a still frame.
2. Set the output size
Original
Resized output preview
Choose an image to begin.
How proportional resizing works
When the aspect ratio is locked, both dimensions use the same scale factor. For example, 1920 × 1080 at 50% becomes 960 × 540. If you unlock the ratio, width and height can be changed independently and the image may look stretched.
Common image sizes
| Use | Dimensions | Ratio |
|---|---|---|
| HD video | 1280 × 720 | 16:9 |
| Full HD | 1920 × 1080 | 16:9 |
| Square post | 1080 × 1080 | 1:1 |
| Portrait post | 1080 × 1350 | 4:5 |
Related tools
Image resolution calculator · Image crop calculator · Pixels to inches · 16:9 ratio guide