Cookie Policy
This site sets no cookies of its own. Google's advertising and analytics tags may set third-party cookies or use similar storage depending on consent signals and account settings. The table lists the cookies they may use; what is set can vary by browser, location and your choices.
Last updated: 4 October 2026.
What a cookie is
A cookie is a small text file a site asks your browser to keep, so that something can be remembered between page views — a preference, a session, or the fact that you have already seen a particular advert. Similar technologies, such as local storage and pixel tags, do the same job by other means; where this page says “cookie” it means all of them.
What this site sets
Nothing. UnitConverter has no login, no saved settings and no shopping basket, so there is no first-party cookie to set. Your conversions are calculated in the page and forgotten when you close the tab.
What Google sets
AdSense runs on indexable pages to request ads. Google Analytics 4 loads for ordinary visits to the live site; it does not load on local copies or automated browsers. Consent signals, browser settings and the AdSense account affect which storage is available. Cookie names and lifetimes are Google’s, not ours, and Google can change them; this table is reviewed whenever the tags change.
| Cookie | Set by | Purpose | Category | Expires |
|---|---|---|---|---|
_ga, _ga_<container-id> | Google Analytics 4 | Distinguishes one visitor from another and keeps a session together. | Analytics | 2 years |
__gads, __gpi | Google AdSense | Measures ad interactions, limits how often you see the same ad, and helps detect click fraud. | Advertising | Up to 13 months |
IDE, test_cookie | Google DoubleClick (doubleclick.net) | Measures and personalises ads across sites, and checks whether your browser accepts cookies at all. | Advertising | IDE up to 13 months; test_cookie 15 minutes |
NID | Remembers ad preferences such as your opt-out of personalised advertising. | Advertising / preference | 6 months | |
FCCDCF, FCNEC | Google's consent message (Funding Choices) | Stores the consent choice you made, so you are not asked again on every page. Set only where a consent message is shown. | Strictly necessary (consent record) | Up to 13 months |
Your choices
- In the EEA, the UK and Switzerland: the site's code sets denied defaults for Google advertising and analytics storage. Denied storage prevents consent-aware tags from reading or writing those cookies, but tags may still send cookieless pings. The defaults do not collect a choice or provide a dialog. If Google displays a consent message configured in the publisher's AdSense account, use that message to set or change your choice; whether such a message is currently enabled is not controlled by this site. If programmatic limited ads are enabled, Google may also use invalid-traffic-only cookies or local storage for fraud prevention; see its limited ads guidance.
- Anywhere: turn off personalised advertising in Google Ads Settings. This changes Google's ad personalisation for your account; whether an ad appears also depends on availability and the publisher's account settings.
- Analytics: install the Google Analytics opt-out add-on to stop Analytics measuring you on every site, not only this one.
- In your browser: every major browser can block or delete third-party cookies from its privacy settings, and a private window discards them when it closes.
- Industry opt-outs: aboutads.info/choices, optout.networkadvertising.org and, in Europe, youronlinechoices.eu.
Blocking every cookie above costs you nothing here. The converters are plain JavaScript and work identically with cookies switched off.
Questions
Email [email protected], or read the privacy policy for what is done with the data these cookies collect.