AliasChat

AliasChat masks personal data before your message reaches claude.ai or ChatGPT, then restores real values on screen.

Data handling: AliasChat processes your chat messages locally in your browser to find and mask personal data. No data is sent to any server. The placeholder map lives in session storage (cleared when you close the browser) and cannot be accessed by web pages. Optional settings sync via your own browser account. No analytics or telemetry. AliasChat keeps personal data on your machine when you talk to an AI. Before a message leaves claude.ai or chatgpt.com, the extension finds email addresses, phone numbers, payment cards, IBANs, national ID and social security numbers, dates of birth, names and street addresses in it and replaces each detected value with a placeholder. The reply comes back with the same placeholders and the page shows you the real values. Runs entirely in the page. No server, no account, no telemetry. A toast tells you how many values were masked each time you send. Card numbers are Luhn-checked and IBANs mod-97-checked, so timestamps and version numbers are left alone. Detectors target common English-language labels and formats. The placeholder map is stored in the browser's session storage (cleared when the browser closes) and is never sent anywhere. Open source, MIT: https://github.com/yhdhappy/AliasChat Not affiliated with OpenAI or Anthropic.