When resizing images for web, social media, or print, you need the constrained dimension — given a 2400×1600 photo and a target width of 800px, the height must be 533px to preserve the ratio. This resizer does that arithmetic instantly and lets you explore multiple target sizes without recalculating manually.
Different platforms specify maximum dimensions in different ways. Twitter limits images to 1280×2048. Instagram square posts need 1:1. YouTube thumbnails are 1280×720. LinkedIn article cover images are 1200×627. Rather than memorising these and doing the math yourself, enter your original dimensions, then target width, and get the correct proportional height in one step.
The image will be stretched or cropped, changing the original ratio. This tool computes the proportionally correct second dimension — use it to avoid that distortion.
Yes. The same arithmetic applies. Enter 1920×1080 and target 1280 width → height = 720. It works for any resolution.
Scaling changes both dimensions proportionally; the entire frame is preserved but smaller (or larger). Cropping removes pixels from the edges to achieve a different ratio without scaling.
You can't — unless your original is already square. To produce a 1:1 square from a 16:9 image you must either crop (remove the sides) or letterbox (add bars top and bottom). This tool computes proportional scaling only.
See the Aspect Ratio Calculator to identify and simplify the ratio of any resolution.