SilentGuard - Prevent AI Data Leaks

Tracking since Apr 1, 2026.

Changelog

• May 8, 2026
  description

  SilentGuard: AI Security and Data Leak Prevention
  
  SilentGuard is a security extension designed to protect your organisation's most sensitive data without slowing down your workforce. By intercepting prompts locally before they leave the browser, SilentGuard prevents employees from accidentally leaking Personally Identifiable Information (PII), Protected Health Information (PHI), credentials, and intellectual property to public Large Language Models (LLMs) like ChatGPT.
  
  Unlike traditional Data Loss Prevention (DLP) tools that require complex network proxies or months of infrastructure changes, SilentGuard brings the security layer directly to the Edge.
  
  Key Capabilities:
  
  Dual-Engine Local Processing SilentGuard operates 100 percent on the user's device. Every prompt is scanned locally using two powerful methods:
  High-Speed Regex Matching: Instantly identifies structured secrets, API keys, credentials, and custom data patterns.
  Bundled Machine Learning (NER): Detects unstructured sensitive data (like names, locations, and organizations) using an optimized internal AI model running directly inside the browser.
  
  Pre-Transmission Interception We hook directly into browser core web requests (Fetch API and WebSockets). If sensitive data is detected, SilentGuard blocks or redacts the text before the network request is ever transmitted.
  
  Absolute Privacy Guarantee Your prompts, code, and sensitive data never leave the machine for analysis. SilentGuard does not use external APIs or third-party clouds to scan your text. When a violation is logged for auditing, we only securely transmit the metadata (e.g., the policy rule triggered) back to your dashboard. The actual prompt content remains exclusively on the employee's machine.
  
  SilentGuard only makes its presence known if an employee attempts to paste a sensitive document, API key, or customer record into an AI chat—at which point it safely blocks the transmission and provides a clear security warning.
  
  Learn more: https://silentguard.ai
  
  Note: This extension requires an active SilentGuard organizational account to authenticate, sync corporate policies, and enable active protection.

  Prevent employee data leaks to AI. Automatically detect and redact sensitive PII and secrets before they reach any AI tool.
  
  A recruiter pastes 50 resumes into ChatGPT to rank candidates.
  A lawyer summarizes a client NDA using Claude.
  A finance lead asks Copilot to analyze a salary spreadsheet.
  
  Each one a potential compliance violation. None of them visible to your security team.
  
  SilentGuard stops it - silently, locally, before it leaves the browser.
  
  ──────────────────────────────────────
  🏢 BUILT FOR ORGANISATIONS, NOT JUST INDIVIDUALS
  ──────────────────────────────────────
  
  SilentGuard is an organisational security tool. Your IT or security lead configures the rules. Every employee in your organisation is protected automatically.
  
  ✓ Set policies by role — Legal, Finance, HR, Engineering
  ✓ Warn or block — your choice per data type
  ✓ Full audit trail — every detection event logged (only metadata)
  ✓ No proxy. No network changes. No IT project.
  
  ──────────────────────────────────────
  🔒 WHAT IT CATCHES
  ──────────────────────────────────────
  
  ✓ PII — Names, emails, phone numbers, national IDs
  ✓ PHI — Patient data, medical records (HIPAA-relevant)
  ✓ Financial — Card numbers, account details, salary data
  ✓ Credentials — API keys, passwords, tokens, .env files
  ✓ Source code — Proprietary logic and internal systems
  ✓ Business secrets — Client names, deal terms, strategy docs
  
  Works across: ChatGPT · Claude · Copilot · Perplexity · Grok and 500+ tools
  
  ──────────────────────────────────────
  ⚖️ COMPLIANCE FRAMEWORKS COVERED
  ──────────────────────────────────────
  
  Organisations using SilentGuard generate the technical evidence  of controls required under:
  
  DIFC Regulation 10 · UAE PDPL · GDPR · HIPAA ·  PCI-DSS · SOC 2 · Singapore PDPA
  
  Detection logs and policy documentation — audit-ready.
  
  ──────────────────────────────────────
  🖥️ 100% LOCAL. NOTHING LEAVES THE DEVICE.
  ──────────────────────────────────────
  
  Every prompt is scanned on the employee's device before  transmission. SilentGuard uses no external servers, no third-party cloud APIs, and no proxy infrastructure to analyse your data.
  
  When a violation is logged, only the policy metadata is transmitted to your dashboard — not the prompt content.
  
  In 2025, popular "privacy" extensions with millions of users were caught harvesting AI conversations and selling them to 
  data brokers. SilentGuard is architecturally incapable of doing this. There is no server to send your data to.

• Apr 17, 2026
  description

  SilentGuard: AI Security and Data Leak Prevention
  
  SilentGuard is a security extension designed to protect your organisation's most sensitive data without slowing down your workforce. By intercepting prompts locally before they leave the browser, SilentGuard prevents employees from accidentally leaking Personally Identifiable Information (PII), Protected Health Information (PHI), credentials, and intellectual property to public Large Language Models (LLMs) like ChatGPT.
  
  Unlike traditional Data Loss Prevention (DLP) tools that require complex network proxies or months of infrastructure changes, SilentGuard brings the security layer directly to the Edge.
  
  Key Capabilities:
  
  Dual-Engine Local Processing SilentGuard operates 100 percent on the user's device. Every prompt is scanned locally using two powerful methods:
  High-Speed Regex Matching: Instantly identifies structured secrets, API keys, credentials, and custom data patterns.
  Bundled Machine Learning (NER): Detects unstructured sensitive data (like names, locations, and organizations) using an optimized internal AI model running directly inside the browser.
  Pre-Transmission Interception We hook directly into browser core web requests (Fetch API and WebSockets). If sensitive data is detected, SilentGuard blocks or redacts the text before the network request is ever transmitted.
  
  Absolute Privacy Guarantee Your prompts, code, and sensitive data never leave the machine for analysis. SilentGuard does not use external APIs or third-party clouds to scan your text. When a violation is logged for auditing, we only securely transmit the metadata (e.g., the policy rule triggered) back to your dashboard. The actual prompt content remains exclusively on the employee's machine.
  
  SilentGuard only makes its presence known if an employee attempts to paste a sensitive document, API key, or customer record into an AI chat—at which point it safely blocks the transmission and provides a clear security warning.
  
  Note: This extension requires an active SilentGuard organizational account to authenticate, sync corporate policies, and enable active protection.

  SilentGuard: AI Security and Data Leak Prevention
  
  SilentGuard is a security extension designed to protect your organisation's most sensitive data without slowing down your workforce. By intercepting prompts locally before they leave the browser, SilentGuard prevents employees from accidentally leaking Personally Identifiable Information (PII), Protected Health Information (PHI), credentials, and intellectual property to public Large Language Models (LLMs) like ChatGPT.
  
  Unlike traditional Data Loss Prevention (DLP) tools that require complex network proxies or months of infrastructure changes, SilentGuard brings the security layer directly to the Edge.
  
  Key Capabilities:
  
  Dual-Engine Local Processing SilentGuard operates 100 percent on the user's device. Every prompt is scanned locally using two powerful methods:
  High-Speed Regex Matching: Instantly identifies structured secrets, API keys, credentials, and custom data patterns.
  Bundled Machine Learning (NER): Detects unstructured sensitive data (like names, locations, and organizations) using an optimized internal AI model running directly inside the browser.
  
  Pre-Transmission Interception We hook directly into browser core web requests (Fetch API and WebSockets). If sensitive data is detected, SilentGuard blocks or redacts the text before the network request is ever transmitted.
  
  Absolute Privacy Guarantee Your prompts, code, and sensitive data never leave the machine for analysis. SilentGuard does not use external APIs or third-party clouds to scan your text. When a violation is logged for auditing, we only securely transmit the metadata (e.g., the policy rule triggered) back to your dashboard. The actual prompt content remains exclusively on the employee's machine.
  
  SilentGuard only makes its presence known if an employee attempts to paste a sensitive document, API key, or customer record into an AI chat—at which point it safely blocks the transmission and provides a clear security warning.
  
  Learn more: https://silentguard.ai
  
  Note: This extension requires an active SilentGuard organizational account to authenticate, sync corporate policies, and enable active protection.

Permissions & access

Permissions

activeTabtabsstoragescriptingoffscreenalarms

Host access

https://*.silentguard.ai/*

Screenshots