Enter dimensions or select a ratio preset, then resize proportionally with a visual preview. All calculations stay in your browser.
01 / DIMENSIONS
Enter both dimensions to simplify their ratio, or leave one blank to calculate it from the selected ratio. Dimensions can use up to four decimals.
02 / RATIO & SCALING
03 / YOUR RESULT
The preview shows proportions, not actual pixels or physical size.
Calculations run in your browser. No dimensions are uploaded, saved or shared.
Enter the values you want to compare; processing happens in your browser.
Adjust optional settings and review validation feedback before relying on the estimate.
Review the formulas and equivalent values, then copy the result you need.
Enter width and height to reduce their ratio, or leave one blank and choose a ratio to calculate it. Optionally scale by a target width, height or percentage.
Simplified integer ratios from decimal dimensions, common presets and proportional scaling without uploading an image or using an external API.
Dimensions are processed in browser memory only. No image or value is uploaded or stored.
Enter positive width and height. Decimal dimensions are converted to a common scale, then both values are divided by their greatest common divisor.
Yes. Leave width or height blank, set a positive ratio such as 16:9, and the missing dimension is calculated from the known one.
Choose a target width, height or percentage. The other dimension changes proportionally. The entered original dimensions and selected ratio are preserved as the reference.
Choose 16:9, 4:3, 1:1, 9:16 or 21:9. A preset keeps the current width and calculates the matching height.
No. The on-page rectangle illustrates the ratio only; no image files are loaded or modified.
Dimensions may have up to four decimal places within the displayed limits. Calculations stay in browser memory and are not uploaded or stored.