מחיקון · Mechikon — PII Anonymizer for AI Chats

Mask Hebrew & English personal details before sending them to ChatGPT, Claude or Gemini — 100% in your browser.

Upload Word or Excel and download it masked in the same format. Spreadsheets display as real tables with one-click column masking. Improved stability under heavy use and one-click problem reporting. Mechikon masks sensitive personal information before it ever reaches an AI chat. Type or paste into ChatGPT, Claude, or Gemini as usual. Mechikon detects names, ID numbers, phone numbers, emails, credit-card and other sensitive values, and replaces them with neutral tokens like [NAME_1] before the message is sent. The AI sees only the masked text. When the answer comes back, tokens are turned back into the real values automatically AND locally, in your browser. WHY MECHIKON Your sensitive data never leaves your device. Masking and restoring happen entirely on-device. The AI only ever receives masked tokens, never the real values. Works in both Hebrew and English - it detects the language of your text and masks accordingly. Handles files too: drop a PDF, Word, Excel, or text file into the popup to get a masked, AI-ready version. Word and Excel download masked in their original format - headers, comments and document properties included. Excel files display as a real table: click a column header to mask an entire column - names, phones, accounts - in one click. WHAT IT DETECTS Names, organizations, and places (Hebrew and English) Israeli ID (Teudat Zehut), company numbers, IBAN, bank accounts, phone numbers Email addresses, credit-card numbers, US SSN and US phone numbers Anything you select by hand - click a word to mask it yourself. PRIVACY BY DESIGN No accounts, no tracking, no analytics, no ads, no servers. The only network request is a one-time download of the name-detection model from the Hugging Face CDN - model weights only, never your text. The restore key is stored locally and expires 48 hours after last use. If a file cannot be fully masked automatically, Mechikon warns you before downloading - never a silently leaking file. Ran into a problem? The built-in report button prepares an email with a technical log - no personal content, and nothing is ever sent without you. Made for anyone who wants to use AI chats without handing over personal data.