SNILS

Browser Extension Anonymizes Sensitive Data Before Sending to AI Chatbots

A new browser extension automatically detects and replaces sensitive information such as names, INN numbers, bank cards, and emails with pseudonyms before any text or files reach AI chat services. The tool operates entirely locally in the browser, ensuring original data never leaves the user's device while allowing AI models to process anonymized placeholders. Responses from the AI are decrypted back to readable form only on the user's screen using an in-memory mapping that disappears when the browser closes. The solution supports over 70 file formats including DOCX, XLSX, and PDF, plus offline OCR for scanned documents to handle the most common leakage vectors used by HR, legal, and accounting teams. Multiple validation layers including checksums, Luhn algorithm, entropy checks, and normalization for Russian name declensions reduce false positives that plagued earlier regex-based attempts. The extension is available in a free version on the Chrome Web Store covering 33 data categories, with advanced file and scan features offered on request.