Plan a proportional image resize

Enter the original dimensions and one target width. This page calculates pixels, not the final compressed file size.

A file to open in Paint

Download the original 1600 × 1000 PNG. The circle should stay round after a proportional resize.

For an exact aspect ratio that produces a fractional pixel, rounding changes the ratio slightly. Check your app’s resulting dimensions.

Original HowCurio practice material. Runs in this browser without uploading a file.