LLM Mask Plus – AI paste guard

Replaces names, ID numbers, IBANs, passwords and company terms with placeholders before they reach ChatGPT, Gemini or Copilot.

LLM Mask checks what you paste, drop, upload or send in an AI chat and replaces sensitive details with placeholders such as [NAME_1] and [IBAN_1] before the text leaves your browser. The AI still understands the question. When you copy the answer, the real details are put back. Everything runs on your computer. There is no account, no server and no data collection. LLM Mask has no way to see your text. WHAT IT RECOGNISES • Names, addresses and Dutch postcodes • Email addresses and phone numbers • IBANs and card numbers (with checksum), BSN (with the "elfproef"), Belgian, German, Turkish, Chinese, Indian and Middle Eastern ID numbers (Aadhaar, PAN, Emirates ID, Iqama, T.C. Kimlik No, Pakistani CNIC, Spanish DNI/NIE, German pension and health insurance numbers, Portuguese citizen card, Hungarian, Slovenian and Icelandic ID numbers, Polish PESEL, Romanian CNP, Italian codice fiscale, French NIR, UK National Insurance, Swiss AHV, Brazilian CPF, Mexican CURP, US Social Security numbers and ITINs, Canadian Social Insurance Numbers, South African, Nigerian, Ghanaian, Kenyan and other African ID numbers (all 54 countries) and more, with their checksums, also in Arabic or Persian digits), passport numbers and scanned passport lines • Dates of birth, customer and reference numbers, meter and EAN codes • Health data: Dutch care identifiers (AGB, BIG, UZI, DBC), ICD-10 and ICPC codes, conditions and medicines when the text is about a person • Passwords, API keys, tokens and private keys – these can never be pasted or sent as they are • Your own company terms: client names, project names, anything confidential WHAT IT DOES • Asks first: a dialog shows what was found (partly masked) and a preview of the text with placeholders. Choose Replace, Paste as it is, or Cancel. • Checks typed text when you press Enter or the send button, not only pastes. • Spreadsheet pastes: a "Paste column names only" button keeps the data rows on your computer. • Looks inside text, Word, Excel and PowerPoint files and PDFs with text before they are uploaded, and offers a cleaned copy with placeholders (author names removed too); other files (scans, images) are asked about or blocked. Downloads from AI sites can be logged or blocked. • Copy-restore: copying an answer that contains placeholders puts the real details back on your clipboard. • Warns when a copied answer contains signs of prompt injection or invisible characters. • Presets: balanced, strict, light, healthcare. OPTIONAL, OFF UNTIL YOU SWITCH THEM ON • A model that runs on your own computer and finds names on no list, dates of birth, health details and more. It is downloaded once when you switch it on. • Scans, photos and the pictures inside documents read with text recognition, and QR codes and barcodes. • Safe dictation: speak in LLM Mask's own window. Your speech becomes text on your computer and is checked before it goes into the chat. The audio is never sent. Only the speech models for the languages you tick are downloaded. • A switch that stops AI chat sites from using your microphone. FOR COMPANIES • Central settings through Google Admin, Windows policy (.reg), Microsoft Intune or a macOS profile; locked settings can't be switched off. • Activity log with counts only – never text – with CSV export and optional reporting to an address you control, with a ready-made Google Sheet dashboard and alerts. • One-page AI use policy templates (Dutch and English) and a GDPR/AVG overview for your records. WHERE IT WORKS On the web versions of the AI chat services it is allowed to run on (the sites listed in its permissions), such as the chat pages of OpenAI, Google and Microsoft. It does nothing on any other website. LIMITS, STATED PLAINLY LLM Mask does not recognise everything. Names that don't start with a common first name are found only after a cue word, or when you import your own name list or add them as company terms. It reads inside text, Word, Excel and PowerPoint files and PDFs with text; scans and images only when you switch that option on (otherwise a picture inside a Word file is reported as not checked), and it does not cover desktop or mobile AI apps. Dictation can mishear words, so read the text before you send it. Typed text is checked when you send it, so the AI site's own scripts can read it while you type; what you paste, drop or upload is checked before the site gets it. Files an AI service fetches directly from connected cloud storage never pass through your browser, so they aren't checked. You remain responsible for what you share. Privacy policy: https://llmmask.app/en/privacy/ Website: https://llmmask.app Support: info@llmmask.app