Cookie Policy & Tracking Technologies
Transparent disclosures detailing how UnitConverters.help utilizes cookies, browser local storage, and third-party advertising identifiers to deliver reliable, fast, and accessible unit conversion tools.
Privacy-First Architecture:
When you perform mathematical conversions on UnitConverters.help, your numbers and calculations are processed 100% locally on your device. We do not store or transmit your calculation values into cookies or remote tracking databases.
1. What Are Cookies and Local Storage?
Cookies are small alphanumeric text files stored on your computer, tablet, or smartphone by your web browser when you visit websites. They enable websites to remember user preferences, maintain session security, and collect diagnostic analytics to improve performance.
In addition to HTTP cookies, modern web browsers utilize HTML5 Local Storage and Session Storage, which function similarly but allow persistent storage of user preferences (such as your chosen unit system or color theme) directly in your browser without transmitting data on every HTTP server request.
2. Categories of Cookies We Use
| Category | Purpose & Description | Lifespan | Provider |
|---|---|---|---|
| Strictly Necessary | Required for core website functionality, security, CSP nonce protection, and server load balancing. Cannot be deactivated. | Session / Up to 24 hours | UnitConverters.help |
| Functional & Preferences | Stores your UI preferences, such as selected unit systems (Metric vs Imperial), recent unit history drawer, and dark mode state. | Persistent (Local Storage) | UnitConverters.help |
| Analytics & Performance | Collects aggregated, anonymized usage telemetry to identify slow-loading pages, broken conversion links, and overall visitor volume. | Up to 2 years | Google Analytics (GA4) |
| Advertising & Targeting | Used by Google AdSense and certified advertising networks to display contextual or personalized advertising that supports our free service. | Up to 13 months | Google AdSense / DoubleClick |
3. Third-Party Advertising & Google AdSense Cookies
To keep our comprehensive catalog of 79 conversion categories 100% free and open-access for students, researchers, and engineers worldwide, we display programmatic advertisements provided by Google AdSense.
- Third-Party Vendors: Google and certified third-party ad technology vendors use cookies to serve ads based on your prior visits to UnitConverters.help or other websites across the web.
- Personalized Ads: Google's use of advertising cookies (such as DoubleClick) allows it and its partners to serve ads relevant to your interests.
- EU / UK User Consent: For visitors from the European Economic Area (EEA) and the United Kingdom (UK), advertising cookies are deployed in strict accordance with the IAB Europe Transparency and Consent Framework (TCF v2.2) and Google's EU User Consent Policy.
4. How to Opt Out of Personalized Advertising
You have complete control over whether advertisers use cookies to personalize ads for you. You may opt out at any time through the following industry portals:
- Google Ads Settings: Manage or disable personalized Google ads at google.com/settings/ads.
- Digital Advertising Alliance (US): Opt out of third-party interest-based advertising via www.aboutads.info/choices/.
- European Interactive Digital Advertising Alliance (EDAA): EEA and UK users can opt out at www.youronlinechoices.com.
- Network Advertising Initiative (NAI): Opt out of member ad networks at optout.networkadvertising.org.
5. Managing Cookies in Your Browser
Most web browsers allow you to manage cookie preferences directly in your browser settings. You can choose to block all cookies, delete existing cookies, or receive a warning before a cookie is stored:
- Google Chrome: Settings → Privacy and security → Cookies and other site data.
- Mozilla Firefox: Options → Privacy & Security → Enhanced Tracking Protection & Cookies.
- Apple Safari: Preferences → Privacy → Manage Website Data.
- Microsoft Edge: Settings → Cookies and site permissions → Manage and delete cookies.
Note: Blocking strictly necessary cookies or clearing local storage may reset your personalized settings, such as your dark mode choice or recently saved calculations.
6. Questions & Contact Information
If you have any questions or data requests regarding our use of cookies or privacy compliance, please contact our data privacy officer:
Email:privacy@unitconverters.help or visit our Contact Page.