Last updated: 12 September 2026.
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Theme preference
The “Choose colour theme” control opens a menu headed “Change and remember theme”, with a short explanation of the storage purpose and how to return to the system setting. Merely opening the menu stores nothing. Only choosing “Light” or “Dark” saves the preference in the browser's local storage (localStorage). The iptools-theme entry contains either light or dark and is used only to restore the appearance. If you make no choice, the site follows the system preference and does not create this entry.
Removing the data
Choosing “System” removes the iptools-theme entry. You can also remove it by clearing site data for iptools.pl. Blocking local storage does not disable calculators, but the selected theme will not persist. Parameters included in a link are not stored there; remove the part after # to take them out of the address.
Future changes
Before adding technology that requires a user choice, the site will identify its provider, purpose, and duration and provide appropriate controls. Merely using the site will not be presented as consent.