A precision Chrome extension that overlays an interactive protractor on any webpage. Perfect for designers, developers, educators, and professionals who need exact angle measurements.
Every feature designed for accuracy, ease of use, and seamless integration with your workflow
Prevent accidental movement during precise measurements. Lock the protractor in place and capture screenshots with measurements visible.
See both the smaller angle AND its complement (360° - angle) simultaneously. Perfect for designers who need both inside and outside angles.
Dynamically resize from 200px to 800px and rotate the entire protractor while keeping measurements accurate. Perfect positioning every time.
See your webpage content underneath with only 20% opacity. Shadow DOM isolation ensures zero conflicts with any website.
Optional 5° snap mode for quick common angles. Perfect for measuring standard design angles like 30°, 45°, 60°, and 90°.
Full English and Korean (한국어) internationalization. Complete UI localization for global accessibility.
Drag the handles to measure angles in real-time. This interactive demo shows exactly how the extension works on any webpage.
How to use:
• Drag the blue and green handles to set angles
• Move the center point to reposition
• Watch the angle update in real-time
Whether you're designing, developing, teaching, or creating - precise angle measurement is just one click away
Measure rotation angles in CSS, verify diagonal layouts, and check design implementation accuracy
Debug CSS transforms, verify SVG path angles, and test geometric calculations in real-time
Teach geometry online, demonstrate angle measurement, and solve problems in digital textbooks
Review digital blueprints, measure CAD drawings in browser, and verify structural angles
Install the extension in seconds and start measuring angles on any webpage