Cookie Policy
factonisam sets no cookies of its own. The only cookies that can appear are Google AdSense advertising cookies, and they are not loaded at all unless you press Accept on the banner.
What cookies are, and what they are not
A cookie is a small text file a website asks your browser to keep and send back on later requests. It is how a site recognises a returning browser. Related technologies do similar jobs: localStorage keeps data on your device but, unlike a cookie, does not travel with every request, and a web beacon is a tiny invisible image used to register that a page was loaded.
Cookies are usually grouped by purpose. Strictly necessary ones make a site work at all. Preference ones remember a choice you made. Analytics ones measure how a site is used. Advertising ones support ad selection and measurement. This site uses none of the first three categories as cookies, uses no analytics at all, and uses the fourth only with your consent.
Every item this site can store
Here is every item this site can put on your device, by name.
| Name | Type | Purpose | Lifetime |
|---|---|---|---|
fs-theme | localStorage (ours) | Remembers whether you chose light or dark mode | Until you clear site data |
fs-consent | localStorage (ours) | Remembers your answer to the cookie banner so it stops asking | Until you clear site data |
fs-recent | localStorage (ours) | Last twelve calculators you opened, for the recent-tools list | Until you clear site data |
fs-fav | localStorage (ours) | Calculators you starred | Until you clear site data |
__gads, __gpi | Cookie (Google) | Ad serving, frequency capping and fraud prevention | Up to 13 months, set by Google |
IDE, test_cookie | Cookie (DoubleClick) | Ad measurement and conversion attribution | Up to 13 months, set by Google |
NID | Cookie (Google) | Preferences and ad personalisation across Google services | Up to 6 months, set by Google |
The exact set of Google cookies is decided by Google and can change; the names above are the ones typically set by AdSense at the time of writing. None of the four fs- items identifies you, and none of them is a cookie — they never leave your device.
Your consent choice
The first time you visit, a banner asks whether to allow advertising cookies.
- Accept stores
fs-consent="accepted"and loads the Google AdSense script, which may then set the cookies listed above. - Reject non-essential stores
fs-consent="rejected"and the AdSense script is never added to the page. No advertising cookie is set, and no request is made to Google's ad servers.
To change your mind, clear this site's data in your browser and the banner will ask again on your next visit. That also removes your theme, favourites and recent tools, since they live in the same place.
Managing cookies in your browser
You can also control cookies in the browser itself. The paths below change from version to version, but the settings are in roughly these places:
- Chrome: Settings → Privacy and security → Third-party cookies
- Firefox: Settings → Privacy & Security → Cookies and Site Data
- Safari (macOS): Settings → Privacy → Manage Website Data
- Safari (iOS): Settings app → Safari → Block All Cookies
- Edge: Settings → Cookies and site permissions
To turn off personalised advertising without blocking cookies entirely, use Google Ads Settings or aboutads.info/choices. Blocking all cookies will not break any calculator on this site — the tools do not use cookies. The privacy policy explains what the advertising cookies do in more detail.
Do Not Track and Global Privacy Control
Browsers can send a Do Not Track header or a Global Privacy Control signal announcing that you do not want to be tracked. There is no industry-wide agreement on how a site should respond to Do Not Track, and most sites ignore it entirely.
Our position is simpler than a header. This site does not track you at all: no analytics, no fingerprinting, no cross-site identifiers of our own, and no cookies except the advertising ones you explicitly accept. If you reject the banner, nothing capable of tracking you is ever loaded, whatever your browser signals.
Where a Global Privacy Control signal is legally binding — for example under California law — we treat it as an opt-out of any sale or sharing of personal information. Since we neither sell nor share personal information, that changes nothing in practice. Google's own response to these signals is governed by Google's policies rather than ours, which is the strongest reason to reject advertising cookies if you would rather not be profiled at all.