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Overview

AmbientMeta Privacy Guard is a Chrome extension that automatically detects PII as you type into LLM chat interfaces. It works on: The extension highlights detected entities inline and lets you sanitize text with one click before sending it to the LLM.

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How It Works

  1. Real-time scanning — As you type in a chat input, the extension calls the AmbientMeta API to detect PII entities in your text.
  2. Inline highlighting — Detected entities (names, emails, phone numbers, etc.) are highlighted directly in the input field.
  3. One-click sanitize — Click the sanitize button to replace all detected PII with safe placeholders before sending your message.
All detection runs through the AmbientMeta backend API (POST /v1/sanitize), so detection quality is identical to the API and every scan feeds the learning flywheel.

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Authentication

The extension supports two modes:

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Signed Out (Free)

  • Uses a shared extension key
  • Limited to 50 sanitizations per day (detection/highlighting is unlimited)
  • No account required

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Signed In (Google)

  • Sign in with Google via the extension popup
  • The extension authenticates using POST /v1/auth/google-extension
  • An API key is automatically provisioned for your account
  • Unlimited sanitizations on paid plans

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Daily Limits

ModeDetection (highlighting)Sanitization
Signed outUnlimited50/day
Signed in (free plan)Unlimited50/day (server-enforced)
Signed in (Pro)UnlimitedUnlimited
Signed in (Pro Plus)UnlimitedUnlimited
Detection calls (for inline highlighting) do not count toward the daily limit. Only full sanitization requests are counted.

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Configuration

The extension scans for these entity types by default:
  • PERSON — Names
  • EMAIL_ADDRESS — Email addresses
  • PHONE_NUMBER — Phone numbers
  • SSN — Social Security Numbers
  • CREDIT_CARD — Credit card numbers
  • LOCATION — Places and cities
  • ADDRESS — Physical addresses

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Technical Details

  • Manifest V3 Chrome extension
  • Detection debounced at 1.5 seconds after typing stops
  • Minimum 10 characters before scanning triggers
  • All API calls go through the background service worker
  • Credentials stored in chrome.storage.local

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Installation

The extension is available from the Chrome Web Store. After installing:
  1. Click the AmbientMeta icon in your toolbar
  2. (Optional) Sign in with Google for higher limits
  3. Navigate to ChatGPT, Claude, or Gemini
  4. Start typing — PII will be highlighted automatically