Local developer utility

Aspect Ratio Calculator

Calculate a reduced aspect ratio and a proportional target height. Your input stays in your browser while you work.

Aspect Ratio Calculator🔒 Processed locally

How to use Aspect Ratio Calculator

Complete the labeled fields above, choose an action, and inspect the result before copying or downloading it.

Processing runs locally in this browser. No input is uploaded or sent to a conversion service.

Image Editor — Crop, resize, rotate, draw, annotate, add text, and apply grayscale, sepia, blur and brightness filters locally.
Bulk Image Converter — Convert image formats in bulk with optional resizing and quality controls. Download individual files or a ZIP.
Image Converter — Convert local image files to supported browser image formats.
Image Resizer (Batch) — Resize local images to chosen dimensions and download the results.