Legal
Plain language, no lawyer-speak: this site is designed so that it barely stores anything about you at all.
Exactly one preference: whether you last used centimetres or inches in the converter. It is kept in your browser's localStorage so the converter opens the way you left it, and it never leaves your device. Clearing your browser data removes it. Nothing else is stored — in particular, your head measurement is not remembered.
This site uses Google Analytics (gtag.js, property G-C25HJJN7J2) to count aggregate page views and see which tools people use — but only if you accept it in the cookie banner. When you accept, Google Analytics stores cookies in your browser (such as _ga) and sends usage data to Google, where IP addresses are not stored. Your choice is kept in the browser's localStorage (key hc-consent); clearing browser data lets you choose again, and a cookie blocker also blocks measurement. We cannot see who you are, and we cannot link a conversion result to an individual.
Any advertising on this site is placed outside the converter and outside the charts. If personalised ads are ever enabled, that section will be updated first with the concrete details and any consent choices you have.
Questions about this policy or a data request:wiskytoys@gmail.com. Because no personal data is collected, there is generally nothing to export or delete.