F12 is a page inspector that runs entirely on your device.
F12 does not collect, transmit, sell, or share any data. There are no servers, no analytics, no tracking, and no accounts.
Your settings and the CSS edits you make are saved in your browser's local extension storage so you can review, re-apply, or export them. This data never leaves your machine, and you can delete it at any time from within the extension or by removing the extension.
F12 only runs on a page when you explicitly invoke it by clicking its toolbar icon, reads that page locally to show you its styles, colors, fonts, and assets, and makes no network requests.
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Last updated: July 2026