About Online Image Angle
Empowering professionals, students, and researchers with sub-pixel loupe precision for photo angle measurement.
Our Mission
Online Image Angle (onlineimageangle.com) was created to solve a common challenge faced by medical clinicians, architects, mechanical engineers, and students: measuring exact angles on photographs, blueprints, and X-rays accurately without physical screen distortion or parallax errors.
Traditional physical protractors placed against computer monitors produce inaccuracies due to screen refraction and limited resolution. Our web application provides a hardware-accelerated, sub-pixel digital measurement suite directly in your browser.
Key Technical Innovations
Sub-Pixel Loupe Magnifier
4x hardware-accelerated pixel loupe circle that amplifies fine line details and allows 1px micro-nudge keyboard alignment.
2-Line Virtual Intersection
Vector dot product mathematics projecting infinite rays to compute intersection angles even when lines do not physically meet inside the image frame.
Draggable Digital Protractor
Interactive 360-degree ruler overlay with center origin drag handle for visual baseline alignment.
Zero-Server Local Privacy
100% in-browser HTML5 Canvas processing ensuring sensitive medical X-rays and proprietary CAD files never leave your computer.
Who We Serve
- Healthcare Professionals & Therapists: Measuring knee flexion, Cobb angles, joint range of motion, and orthopedic X-rays.
- Architects & Contractors: Calculating roof pitch, structural beam slopes, and elevation angles from site photos.
- CAD Engineers & Draftsmen: Auditing mechanical schematics, vector angles, and part intersections.
- STEM Educators & Students: Studying physics trajectory vectors, trigonometry geometry, and optics angles.