Last updated: 2026-06-21
GlyphProbe runs entirely on your device and has no backend. The short version: nothing leaves your browser.
GlyphProbe has no server, no account, no analytics, and no tracking. We (the developer) never receive any data from you. The extension makes no network requests.
When you click the GlyphProbe icon, it scans the page you are currently viewing once to read the fonts used by text elements — their computed font styles, the page's document.fonts set, its document.styleSheets (for @font-face declarations), and canvas text metrics — so it can determine which fonts loaded versus fell back. This scan runs locally in your browser. It happens only on the tab you explicitly click, only at that moment (via Chrome's activeTab permission); the extension has no standing access to any website.
The results of your most recent scan are saved only on your device using Chrome's storage API, so the report page can display them. This data never leaves your machine and can be cleared by removing the extension. JSON, CSV, and PDF reports you export are saved by you, to your own computer, when you choose to.
activeTab — scan only the tab you click the icon on, at that moment.scripting — inject the one-shot, read-only scan into that tab. The only thing written to the page is a temporary scroll-to highlight you trigger.storage — keep the last scan's results locally for the report page.Questions: [email protected]
Any changes will be posted at this URL with an updated date.