Cookie and local-storage policy

42Math uses a small amount of first-party browser storage for site preferences and convenience. Google services may also use cookies or similar technologies for measurement and advertising.

Effective and last updated: 19 July 2026

What browser storage means

Cookies are small values that a site or service can store through your browser and receive with later requests. Local storage is kept by the browser for a site but is not automatically included in each network request. Both can remember information between visits.

42Math first-party local storage

• theme remembers a selected light or dark appearance.
• 42m_history stores up to ten recently visited tool identifiers so the site can offer convenient navigation.
• brand42LoadCount is a local counter used to vary a decorative brand animation.

These values do not contain a name, email address, or calculator input. They remain on your device and can be removed by clearing site data for 42math.com.

Google Analytics

Google Analytics may set or read cookies and similar identifiers to distinguish visits, measure interactions, estimate usage, and reduce duplicate counting. The exact names and duration can change as Google updates the service. See Google Analytics cookie usage for current provider information.

Google AdSense

Google AdSense and participating advertising partners may use cookies or local storage to deliver ads, prevent repeated ads, detect invalid activity, measure performance, and personalize advertising where permitted. The providers and storage used can vary by location, consent choice, browser, and available advertising demand.

See Google advertising technologies and third-party vendors and ad networks.

Consent

Where applicable law requires consent for optional storage or processing, those technologies should be controlled by the consent choices presented to you. Essential delivery, security, and user-requested preference storage may be treated differently under local law. You can revisit available consent controls or clear stored choices through your browser.

How to manage storage

• Use browser settings to view, delete, block, or limit cookies and local storage.
• Use Google Ad Settings to control ad personalization associated with Google.
• Install the Google Analytics opt-out browser add-on.
• Use private-browsing or browser-profile features where appropriate.

Blocking storage may reset the theme and recent-tool list, reduce personalization, or affect advertising and measurement. The calculators themselves generally do not require these convenience values.

More information

The privacy policy describes the associated data processing, purposes, providers, retention, and visitor rights. Questions can be sent to 42math.com@gmail.com.