FAQPage | True Size Ruler
Everything you need to know about True Size Ruler.
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About
— Accurate online screen ruler. True Size auto-detects PPI for pixel-perfect measurements in cm, mm, and inches. Calibrate instantly on any digital display.
Contact
— Questions, feedback, or bug reports — we'd love to hear from you.
How It Works
— True Size screen ruler calculates true PPI using auto-device detection, diagonal formulas, or physical credit card calibration for precise accuracy.
Privacy Policy
— True Size privacy policy: We collect no personal data or tracking cookies. All ruler calibration runs locally in your browser.
Blog
— Guides, explainers, and reference articles about screen measurement, display technology, and precision tools.
FAQ Page
— Everything you need to know about True Size Ruler.
Terms Of Service
— True Size Terms of Service: Free on-screen ruler provided "as is." Read our accuracy disclaimer, intellectual property rules, and limitation of liability.