Drop an image here, paste from clipboard, or click to browse

Supports: PNG, JPEG, GIF, WebP

How it works

Upload an image and place one or more protractors. Drag a protractor to position its vertex; drag the two arm handles to set the angle you want to measure; scroll the wheel over a protractor to resize it. The angle between the arms updates live. Everything runs locally in your browser — images never leave your device.