1. What Are Cookies and Local Storage?
Cookies are small text files placed on your computer or mobile device by websites that you visit. They are widely used to make websites work properly, improve browsing efficiency, and provide analytical or marketing telemetry to site operators.
In addition to traditional HTTP cookies, modern web applications like Ruler Online utilize HTML5 Local Storage (localStorage). Unlike cookies, data stored in local storage does not transmit with every web request to the server; it remains strictly inside your browser, making it faster, more secure, and inherently more private.
2. How Ruler Online Uses Browser Storage
We employ browser storage strictly for necessary utility features and to preserve your measurement environment across visits:
| Identifier | Storage Type | Purpose | Lifespan |
|---|
ro:v1:cal | HTML5 LocalStorage | Essential: Stores your calibrated screen PPI (pixels per inch) value so you don’t have to recalibrate with a credit card every time you open the site. | Persistent (until cleared) |
ro:v1:theme | HTML5 LocalStorage | Functional: Remembers your chosen theme (Dark Mode vs Light Mode) to prevent sudden bright flashes when loading pages. | Persistent (until cleared) |
ro:v1:lastUnit | HTML5 LocalStorage | Functional: Remembers your last active measurement unit (cm, mm, inch, or pixel). | Persistent (until cleared) |
3. Third-Party Advertising & Analytics Cookies
To maintain Ruler Online as a free service without mandatory subscription fees, we partner with reputable third-party advertising networks, primarily Google AdSense.
When you visit our site, Google and its advertising partners may place or read cookies on your browser. These cookies serve the following purposes:
- Ad Delivery & Frequency Capping: Ensuring you do not repeatedly see the exact same advertisement.
- Fraud Prevention & Bot Detection: Detecting invalid clicks or fraudulent automated traffic.
- Personalized Advertising: In regions where permitted and where you have granted affirmative consent, Google may serve personalized ads based on your general interests or past browsing history.
| Cookie Provider | Typical Names | Category | Purpose & Opt-Out |
|---|
| Google AdSense / DoubleClick | __gads, __gpi, IDE, test_cookie | Advertising / Marketing | Used to serve ads, limit ad repetition, and measure ad performance. Manage via Google Ad Settings. |
| Consent Management Platform (CMP) | __cmp_consent, euconsent-v2 | Strictly Necessary / Legal | Stores your explicit GDPR/CCPA consent choices under the IAB Europe TCF v2.2 framework. |
4. How to Manage and Disable Cookies
You have multiple ways to manage, block, or delete cookies:
4.1 Via Our Website Consent Tool
You can reopen our Consent Management Platform at any time by clicking the "Privacy choices" link located in the footer of every page on this website. This allows you to review, modify, or withdraw consent for non-essential cookies at your discretion.
4.2 Via Web Browser Settings
Most modern web browsers allow you to control cookie settings through their preferences. You can configure your browser to reject all cookies, block third-party cookies, or clear cookies when you close your browser:
- Google Chrome: Settings > Privacy and Security > Cookies and other site data
- Mozilla Firefox: Settings > Privacy & Security > Cookies and Site Data
- Apple Safari: Preferences > Privacy > Manage Website Data / Block All Cookies
- Microsoft Edge: Settings > Cookies and site permissions > Manage and delete cookies
Please note: Disabling all cookies and local storage will reset your calibrated screen size every time you close your browser tab, requiring manual recalibration on your next visit.
4.3 Industry-Wide Opt-Out Portals
You can opt out of interest-based advertising from participating companies through these industry self-regulatory programs:
5. Updates to This Cookie Policy
We may revise this Cookie Policy from time to time to accommodate technology updates, regulatory requirements, or changes in our operational procedures. Any updates will be published on this page with an updated "Last Updated" date.