CF Explainer (in-browser)
Select an Italian tax code, get birth details and sex: all in the browser, no network request.
Description
Select an Italian tax code (codice fiscale) on any page, right-click and choose "Decode tax code": CF Explainer checks length, format and control character (homocode variants included) and derives day, month, year of birth, sex and municipality of birth from the cadastral-code table bundled with the extension, including suppressed and merged municipalities and current foreign states. The tax code carries the year with two digits only: when the century cannot be determined it shows both readings instead of picking one; if the cadastral code is not in the table it says so. Everything happens in the browser: the tax code is sent to no one and the extension makes no network request. No telemetry.
Features
- Context-menu on selection → tax-code decoding
- Validation of length, format and control character, homocode variants included
- Day, month, sex and year of birth; when the century cannot be determined it shows both readings
- Municipality of birth from the cadastral-code table bundled with the extension (suppressed and merged municipalities, current foreign states)
- No transmission: the tax code never leaves the browser
- If the cadastral code is not in the table it says so, without inventing a place
- Result overlay injected via textContent (no XSS)
- No telemetry
Privacy
100% local processing in your browser. Zero telemetry: no data is sent to external servers.
Required permissions
Screenshots
