Online Protractor

Measure angles directly on your screen or upload an image. Simple, transparent, and fast with three adjustable points. Supports JPG, PNG, GIF, and WebP formats.

or drop image here or paste

Background
0° Current Angle
Grid
Guides
Snap 5°
Thickness 3px
Opacity 80%

How to Use the Online Protractor?

Click to place three points that form an angle - the red vertex point and two blue arm points. Drag any point to adjust the angle in real-time. The measurement updates instantly, showing the exact angle in degrees.

Key Features

Adjustable line thickness and opacity for better visibility. Optional grid overlay and guide lines for alignment. Snap to common angles (45°, 90°, 180°) or enable 5-degree snapping. Save multiple measurements and export results as a text file.

Perfect for Education and Design

Ideal for students studying geometry, architects reviewing blueprints, designers checking angles, or anyone needing quick angle measurements. The transparent overlay allows you to see your image clearly while measuring.

Supported Formats

Upload images in JPG, PNG, GIF, or WebP format. The protractor automatically adjusts to your image size. You can also measure angles directly on your screen without any image.

Privacy Guaranteed

All processing happens in your browser. No images are uploaded to our servers, ensuring complete privacy. Your images and measurements remain on your device throughout the entire process.