Terms of Service

1. Acceptance of Terms

By accessing or using Ruler Online (ruleronline.net, the "Service"), you acknowledge that you have read, understood, and agree to be bound by these Terms of Service ("Terms") and our Privacy Policy. If you do not agree to these Terms, you must immediately cease accessing or using the Service.

2. Description of the Service

Ruler Online provides interactive, browser-based digital measuring tools capable of rendering visual rulers in centimeters, millimeters, inches, and screen pixels. The Service includes calibration wizards (Automatic Profile Detection, Diagonal Dimension Calculation, and ISO Standard Credit Card Sizing), unit conversion utilities, educational measurement guides, and dimensional reference data.

We grant you a non-exclusive, non-transferable, revocable license to access and use the Service strictly in accordance with these Terms for your personal or internal business reference.

3. Calibration & Accuracy Disclaimer

The visual dimensions displayed by the digital ruler are computed based on screen pixel density (Pixels Per Inch, or PPI). You acknowledge that:

• Calibration Requirement: Uncalibrated screens may display inaccurate dimensions. You are solely responsible for calibrating the ruler using our calibration tools prior to relying on any measurement.
• Hardware & Zoom Factors: System display scaling (e.g., Windows 125% or 150% scaling, macOS Retina pixel-doubling) and browser zoom settings (non-100% zoom) alter screen dimensions. For accurate results, your browser zoom must be set to 100%.
• Parallax Error: When holding physical objects against glass screens, optical refraction through the display cover glass may introduce visual parallax distortion.
• No Certification: The tools provided on this website are not calibrated or verified by the International Bureau of Weights and Measures (BIPM), NIST, or any statutory weights and measures authority.

4. Acceptable Use & Prohibited Conduct

You agree to use Ruler Online solely for lawful purposes. You must not:

• Use automated scripts, bots, scrapers, or spiders to harvest content, guides, or data without prior written permission.
• Attempt to compromise, disrupt, overload, or reverse-engineer our web servers, APIs, or software code.
• Frame, mirror, or repackage Ruler Online within another website or commercial application without attribution and explicit authorization.
• Circumvent, manipulate, or block advertisements in a manner that damages or interferes with the service infrastructure.
• Use the Service in any manner that violates applicable federal, state, local, or international laws or regulations.

5. Intellectual Property Rights

All content, software code, SVG graphics, visual designs, typography, articles, calculation algorithms, and trademarks associated with Ruler Online are the proprietary property of Ruler Online or its licensors and are protected under copyright, trademark, and other intellectual property laws.

You may view, print, and save individual articles or reference guides for your personal, non-commercial reference. No portion of the Service’s source code or proprietary content may be copied, reproduced, republished, or distributed without our prior written consent.

6. Third-Party Links & Advertisements

Ruler Online may contain links to third-party websites, external standards documents, or advertisements served by third-party ad networks (such as Google AdSense). We do not control or endorse the content, policies, or practices of third-party websites and assume no liability for damages or losses incurred through interactions with external parties.

7. Disclaimer of Warranties

WE DO NOT WARRANT THAT THE SERVICE WILL BE UNINTERRUPTED, ERROR-FREE, SECURE, ACCURATE TO SCIENTIFIC TOLERANCES, OR FREE OF DEFECTS. YOUR USE OF THE SERVICE IS AT YOUR SOLE RISK.

8. Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL RULER ONLINE, ITS OPERATORS, CONTRIBUTORS, AFFILIATES, OR SUPPLIERS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES (INCLUDING LOSS OF PROFITS, DATA, USE, GOODWILL, MATERIAL CUTTING ERRORS, OR RE-MANUFACTURING COSTS) ARISING FROM OR RELATED TO:

• YOUR ACCESS TO, USE OF, OR INABILITY TO USE THE SERVICE;
• ANY INACCURACIES, OMISSIONS, OR MISCALCULATIONS IN MEASUREMENT TOOLS OR REFERENCE GUIDES;
• DAMAGE TO MONITORS, SCREENS, OR PHYSICAL OBJECTS PLACED AGAINST OR NEAR YOUR DISPLAY.

9. Indemnification

You agree to defend, indemnify, and hold harmless Ruler Online, its officers, directors, employees, and agents from and against any claims, liabilities, damages, losses, and expenses (including reasonable legal fees) arising out of or in any way connected with your violation of these Terms or misuse of the Service.

10. Modifications to Service & Terms

We reserve the right to modify, suspend, or discontinue any aspect of the Service at any time without notice. We also reserve the right to amend these Terms periodically. Any modifications become effective immediately upon posting to this page. Your continued use of Ruler Online constitutes acceptance of the amended Terms.

11. Governing Law & Severability

These Terms shall be governed by and construed in accordance with the laws of the applicable jurisdiction, without regard to conflict of law principles. If any provision of these Terms is deemed unlawful or unenforceable by a court of competent jurisdiction, that provision shall be severed without affecting the validity of the remaining provisions.

12. Contact Information

If you have questions, feedback, or legal inquiries concerning these Terms of Service, please contact us: