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Mask Personal Data Before Pasting Into AI — Free, Works Offline

Scans text for emails, phone numbers, IBANs, card numbers, and IP addresses and replaces each one with a placeholder tag before you paste the text into ChatGPT, Claude, Gemini, or any other AI chatbot. Card numbers are verified with a Luhn checksum and IBANs with a mod-97 checksum. Everything runs locally in your browser — the text you enter is never sent to a server.

Detect and mask personal data before pasting text into an AI tool.

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This tool helps catch common sensitive data, but no automatic detection is 100% guaranteed. Always review the masked text before sending it to an AI.

About this tool

AI Privacy Mask uses regular expressions to find emails, phone numbers, IBANs, card numbers, and IP addresses in text. Card numbers are verified with a Luhn checksum and IBANs with a mod-97 checksum before being replaced, which filters out random digit strings that only look like real numbers. Each data type has its own toggle so you can choose exactly what to mask. All processing happens in your browser — nothing is ever transmitted.

How to use

  1. Paste the text you plan to send to an AI chatbot into the top box.
  2. Uncheck any category you don't want masked using the toggles above the input.
  3. The masked text appears instantly. Click "Copy masked text" and paste it into ChatGPT, Claude, or any other AI.

When to use this tool

  • Pasting a support ticket, email thread, or chat log into an AI for summarizing or drafting a reply.
  • Sharing a spreadsheet excerpt or form data that includes IBANs or card numbers with an AI for analysis.
  • Cleaning IP addresses out of server logs before asking an AI to help debug them.
  • Removing personal data from internal documents before asking an AI for a rewrite or translation.

Why mask data before using AI?

Text you send to AI services like ChatGPT or Claude may be stored, logged, or used for training. Even if a service claims not to store data, real email addresses, phone numbers, financial details, or server IP addresses carry risk once they leave your device. Masking replaces these with neutral placeholder tags ([EMAIL], [PHONE], [IBAN], [CARD], [IP]) so the AI can still understand the structure of your text without seeing the actual data.

Frequently asked questions

What types of personal data does this detect?

Email addresses, phone numbers (international and local), IBANs (mod-97 verified), card numbers (Luhn verified), and IPv4 addresses.

Does it catch every kind of personal data?

No. Names, physical addresses, Social Security numbers, and other sensitive details are not detected. Always review the result before sending.

Why didn't a card number or IBAN get masked?

Card numbers and IBANs are only masked if they pass a mathematical checksum. A number that fails is assumed not to be valid and is left untouched.

Is the text I type ever sent anywhere?

No. Everything runs locally in your browser. The text never leaves your device.

Does it work offline?

Yes. Once the page has loaded, all processing runs locally with no internet connection required.

Why should I mask data before sending it to an AI?

AI services may store or log your input. Masking personal data reduces the risk of exposing real email addresses, phone numbers, financial details, or server IPs.

Can I choose which data types to mask?

Yes. Each category has its own toggle. Uncheck any category you want to leave unmasked.

Is this tool free?

Yes, completely free with no sign-up required and no usage limits.

Everything is processed locally in your browser — the text is never sent to a server, including Alvea Hubs.