Drop an image here, paste from clipboard, or click to browse
Supports: PNG, JPEG, GIF, WebP
No protractors yet. Click "+ Protractor" to add one.
drag move protractor
scroll over protractor resize it
drag arm handle rotate and extend arm
Del delete selected
R reset selected
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.