Ratio Buddy — Aspect & Resize

Enter width/height to get the aspect ratio (e.g., 16:9) and scale to a new size while keeping the ratio.

Ratio Buddy helps you work out aspect ratios and resize dimensions quickly. Type your original width and height to see the simplified ratio (like 16:9), decimal form, and the nearest common ratio. Then scale to a new size while keeping the same proportion—fit by width or height with a click. Everything runs offline in the popup with no tracking and no permissions.