Enter width and height
AspectFit reduces integer or finite-decimal dimensions to exact whole-number terms.
One ratio, consistent dimensions
Keep width and height in proportion.
AspectFit reduces numeric dimensions to whole-number ratio terms and calculates either a target width or a target height. It keeps the unrounded value visible, applies the rounding rule you choose, and lets you copy the result. It processes numbers only and does not alter image files.
Free · No signup · No saved dimensions
Three clear steps
From source dimensions to a copyable answer
Choose one known target side
Supply a target width or a target height, never both; the other side is calculated from the source ratio.
Review and copy
Compare the unrounded value with the chosen whole-number result, then copy the dimensions you need.
Five useful starting points
Use a preset without turning it into a rule
- Use 1:1 for a square, 4:3 for a classic landscape frame, or 3:2 for a wider photographic proportion.
- Use 16:9 as a wide landscape starting point and 9:16 as its portrait counterpart.
- Presets fill the ratio; they do not choose a final dimension pair or file format for you.
Ready to calculate
Keep the ratio, choose the dimension.
Enter two source dimensions, optionally set one target side, and copy the reduced ratio or proportional result.