About
Nexmetra is a free collection of browser-based measurement tools built for anyone who needs quick, accurate results without installing anything.
The Online Ruler turns your screen into a calibrated physical ruler — measure real objects directly against your display in inches or centimeters, with multiple calibration methods including an automatic device-based option.
The Online Protractor measures angles two ways: overlay a virtual protractor on an image, or use your camera to measure real-world angles live. Supports multiple rays and angle groups per session.
The Aspect Ratio Calculator and Finder handle image/video ratio math both directions — calculate dimensions from a ratio, or detect the ratio from an uploaded file. Includes a live social preview grid showing exactly how an image will crop across Instagram, YouTube, and X.
No signup, no downloads, works on any device with a browser.