您的数据保留在您的设备上。

Introduction

Welcome to Accurate Online Ruler ("we," "our," or "us"). This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you visit our website at https://accurateonlineruler.com (the "Site"). Please read this policy carefully. If you do not agree with the terms of this Privacy Policy, please do not access the Site.

We are committed to protecting your personal data and respecting your privacy. This policy is designed to be compliant with the General Data Protection Regulation (GDPR), the California Consumer Privacy Act (CCPA), and other applicable data protection laws.

Information We Collect

Information You Provide

We collect minimal personal information from you. Specifically:

• Contact form submissions: If you use our Contact page, we collect your name, email address, and the message you submit. This information is used solely to respond to your inquiry.
• Bug reports and device information: When you voluntarily report a calibration bug or device issue, we may collect your device model, browser type, screen resolution, and PPI value to help diagnose and fix the problem.

Information Collected Automatically

When you visit the Site, certain information is automatically collected by our hosting infrastructure and content delivery network:

• Browser type and version
• Operating system
• Screen resolution and viewport dimensions
• Referring URL
• Date and time of access
• Aggregated, anonymised usage data (page views, feature usage)

This information is collected via server logs and aggregated analytics. We do not use cookies, tracking pixels, or any third-party analytics services that identify individual users. Any analytics we perform uses anonymised, aggregated data only.

Local Storage & Your Calibration Data

All calibration data — including your PPI value, unit preference (cm/inches), dark mode setting, and device name — is stored exclusively in your browser's localStorage. This data never leaves your device.

• What is stored: PPI value, unit preference, dark mode preference, and device name.
• Where it stays: All preferences are stored locally in your browser's localStorage. They are never transmitted to our servers, stored in databases, or shared with third parties.
• How to clear it: You can clear this data at any time by clearing your browser's site data, using private/incognito mode, or removing the site's localStorage entries via your browser's developer tools.
• No camera access: The ruler tool does not request or access your device's camera. All measurements are screen-based using your display's physical pixel grid.
• No image capture: The tool does not capture, upload, or process any images from your device.

Important: Unlike camera-based online ruler tools that may process images on external servers, our accurate online ruler performs all calculations locally in your browser. No measurement data, screen content, or personal information is ever sent to external servers.

How We Use Your Information

Any information we collect is used for the following purposes:

• To operate, maintain, and improve the online ruler tool
• To respond to your comments, questions, and support requests
• To diagnose technical issues and improve device auto-detection
• To analyse aggregated usage trends and enhance user experience
• To comply with legal obligations and enforce our Terms & Conditions

We do not sell, rent, or share your personal information with third parties for their marketing purposes.

Data Retention

LocalStorage data (PPI, preferences) persists in your browser until you clear it. We have no ability to delete localStorage data remotely because it never reaches our servers.

Contact form submissions are retained for as long as necessary to address your inquiry and for a reasonable period thereafter for quality assurance purposes. If you wish to have your submission deleted, please contact us.

Server logs containing anonymised technical data are retained for no more than 30 days.

Data Sharing & Third Parties

We do not share your personal data with third parties except in the following limited circumstances:

• Service providers: We may share anonymised, aggregated data with hosting and infrastructure providers who are contractually obligated to maintain confidentiality.
• Legal requirements: We may disclose information if required to do so by law or in response to valid legal requests by public authorities.
• Protection of rights: We may disclose information to protect our rights, property, or safety, or that of our users or others.

We do not use third-party advertising networks, tracking cookies, or analytics services that collect personally identifiable information.

Your Rights (GDPR & CCPA)

For European Economic Area (EEA) Users

Under the GDPR, you have the following rights:

• Right to access: Request a copy of the personal data we hold about you.
• Right to rectification: Request correction of inaccurate or incomplete data.
• Right to erasure: Request deletion of your personal data, subject to certain exceptions.
• Right to restrict processing: Request restriction of processing of your personal data.
• Right to data portability: Request transfer of your data to another service provider.
• Right to object: Object to processing of your personal data.

To exercise any of these rights, contact us. We will respond within 30 days.

For California Users (CCPA)

Under the California Consumer Privacy Act, California residents have the right to:

• Know what personal information is collected, used, shared, or sold
• Request deletion of personal information (subject to exceptions)
• Opt out of the sale of personal information (we do not sell personal information)
• Non-discrimination for exercising CCPA rights

To exercise your CCPA rights, contact us.

Children's Privacy

The Site is not intended for children under 13 years of age. We do not knowingly collect personal information from children under 13. If you believe a child has provided us with personal data, contact us and we will take steps to delete it.

Security

We implement reasonable technical and organisational measures to protect your information. However, no method of transmission or storage is 100% secure. We cannot guarantee absolute security of any information you transmit to us.

Changes to This Policy

We may update this Privacy Policy from time to time. Changes will be posted on this page with an updated "Last updated" date. We encourage you to review this policy periodically.

Contact Us

If you have questions about this Privacy Policy or wish to exercise your data protection rights, please contact us.