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Browser Chat protects what people already do: paste real context into ChatGPT, Claude, and Gemini. PasteGuard masks names, emails, account details, customer notes, contracts, support tickets, and other sensitive values before they reach the chat provider. You keep the originals. The AI sees placeholders.
The browser extension is experimental and available for ChatGPT, Claude, and Gemini.

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Supported Platforms

  • ChatGPT (chatgpt.com)
  • Claude (claude.ai)
  • Google Gemini (gemini.google.com)

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How It Works

  1. Paste: You paste text containing PII or secrets into the chat input.
  2. Mask: The extension sends text to your local PasteGuard server’s /api/mask endpoint.
  3. Chat: PasteGuard masks secrets first, then PII, and returns masked text with local placeholder context. The provider sees placeholders such as [[PERSON_1]] and [[EMAIL_ADDRESS_1]].
  4. Copy: When you copy a supported AI response, placeholders are replaced with the original values using the local context.
Placeholder numbering stays consistent across messages in the same conversation. Streamed responses are highlighted in real time.

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Who This Helps

Browser Chat is useful for teams that want AI help with real work but cannot paste raw sensitive data into third-party chat products:
  • Advisors and consultants working with client data
  • Legal teams handling contracts or privileged context
  • Support and success teams working with customer tickets
  • Recruiting and HR teams handling candidate or employee data
  • Finance, insurance, and healthcare-adjacent work with strict confidentiality needs

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Requirements

The extension needs PasteGuard running locally: 
docker run --rm -p 3000:3000 ghcr.io/sgasser/pasteguard:latest
See Quickstart for setup details.

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Browser extension

The browser extension is experimental and available for Chrome or Firefox. The PasteGuard server is open source (Apache 2.0); the extension source is planned to be published on GitHub after the beta stabilizes.

Install the extension

Add PasteGuard to Chrome or Firefox