Disclaimer
Last updated: 14 August 2026
Please read this disclaimer before using Online Free Ruler. It explains the nature of the information we provide, how advertising on the site works, and the limits of on-screen measurements.
General Information, Not Professional Advice
The content on Online Free Ruler — including the ruler tool, this website, guides, and articles — is provided for general information purposes only. It is not professional, legal, medical, engineering, financial, or other specialist advice. Nothing on this site should be treated as a substitute for the judgment of a qualified professional.
Third-Party Advertising Served by Google
The site may display advertisements served by third-party providers, including Google (for example, through Google AdSense). These ads are chosen, served, and measured by Google and its partners according to their own policies. We do not collect advertising-identifying information ourselves, and we do not control which specific advertisements you see. Advertisers are responsible for the accuracy of their own advertising content.
No Guaranteed Measurement Accuracy
Online Free Ruler is designed to provide useful on-screen measurements after calibration, but an on-screen ruler cannot be a certified measuring instrument. Display size, resolution, scaling, browser zoom, and your calibration all affect results. We do not guarantee that any measurement is exact, and you should not rely on the tool for medical, safety, legal, engineering, manufacturing, or other high-precision decisions. Verify important measurements with an appropriate certified physical instrument.
Changes to This Disclaimer
We may update this disclaimer from time to time; the date above reflects the latest revision. Questions about this disclaimer can be sent to support@onlinefreeruler.com.