All tools run entirely in your browser. No uploads, no sign-up, free forever.
Use the Aspect Ratio Calculator — enter original dimensions and target width or height to get the proportional result instantly.
Use the Golden Ratio Calculator to apply the φ = 1.618 proportion to element sizes, font scales, and spacing.
Use the Image Resizer to convert pixel dimensions to print inches at any DPI, and see if your file has enough resolution before sending to print.
Check our Social Media Sizes guide for the exact pixel dimensions recommended for every major platform in 2026.