ChatDataMask: Data Leak Prevention for ChatGPT & Claude
Support your GDPR & EU AI Act workflow with local PII masking. Prevent AI data leaks by tokenizing names, emails, phone numbers, IDs, and financial records — entirely inside your browser, before they ever reach ChatGPT, Claude, or any cloud model.
Add to Chrome — It's Free
Robust PII & Data Masking Capabilities for Professionals
Built specifically for recruiters, HR teams, lawyers, compliance officers, analysts, developers, and copywriters who want to leverage the power of Artificial Intelligence safely, without violating GDPR, CCPA, or client confidentiality.
Comprehensive PII & Secret Redaction Engine
ChatDataMask uses advanced local heuristics, checksum validation, and tokenization to detect and mask confidential data locally in your browser — no data ever leaves your device. Choose the plan that fits your GDPR, EU AI Act, or CCPA compliance workflow.
Free Plan
- ✅ 100% Local On-Device Masking
- ✅ Zero-Data Retention Architecture
- 🔒 Identity, Names & Contacts:
- • Personal & Company Names
- • Contact Details, Emails, Usernames & Links
- • Global Phone Numbers (via libphonenumber-js)
- 📍 Location & Logistics:
- • Physical Addresses & Street Markers
- • PO Boxes & Private Mail Boxes
- • Multi-country Postal Codes & ZIP Tracking
- • Geolocation Data (GPS Coordinates & Maps URLs)
- 💻 Technical Assets, Passwords & Keys:
- • Cloud API Tokens (OpenAI, GitHub, AWS, Slack)
- • Infrastructure Access Keys (Raw SSH, PEM, PGP, RSA)
- • Custom Passwords, Credentials & Bearer Tokens
- • Network Targets (IPv4, IPv6, MAC & Device IMEI)
- 💳 Global Financial Obfuscation:
- • Global Bank SWIFT Routing Codes
- • Payment & Credit Card Numbers
Pro GDPR & CCPA Compliance
- ✨ Everything in Free Plan, plus:
- 🇪🇺 Advanced European EU Compliance:
- • Corporate VAT Numbers & Business Registries
- • National Identification & Tax Numbers (TIN)
- • Passport Numbers & Government Records
- 💳 Standard Financial & Web3 Masking:
- • International Bank Account Numbers (IBAN)
- • Crypto Wallets & Chains (BTC, ETH, Tron, Litecoin, XRP, Stellar, Algorand, Monero, BNB, EVM)
Stop Exposing Confidential Data to Artificial Intelligence
Every time you paste client contracts, CVs, or financial reports into ChatGPT, Claude, Gemini, or Copilot, you risk a data leak, an unintended data breach, or a compliance violation that IT can't undo.
🔒 Local-First Architecture
Text obfuscation and token restoration happen 100% inside your browser's Side Panel — a true on-device data loss prevention layer. Your data never touches external servers or privacy-degrading cloud infrastructure.
💡 Smart Context Retention
Instead of breaking sentences, ChatDataMask replaces PII with readable placeholders (e.g., [NAME_1]) — a lightweight tokenization technique that lets LLMs understand the core context perfectly, with zero loss of accuracy.
🚀 One-Click Restoration
Once the AI generates its output, securely reverse the masked text back to your original data with a single click, right inside your workflow — no copy-pasting between tools.
Frequently Asked Questions
Everything you need to know about ChatDataMask privacy, technology, and compliance.
Does ChatDataMask send my text to any servers?
No. ChatDataMask features a local-first design. All text anonymization and PII extraction happen entirely within your local browser sandbox.
Will AI models still understand my prompt?
Yes. The extension swaps identifiable entities with structural tags. This preserves grammar and context, ensuring optimal AI responses.
Which AI web platforms are supported?
ChatDataMask is fully optimized to work seamlessly alongside public web interfaces including ChatGPT (OpenAI), Claude (Anthropic), Google Gemini, and Microsoft Copilot.
What is data masking and how is it different from encryption?
Data masking replaces a sensitive value, like a name or ID number, with a safe structural placeholder before your text ever leaves your device, instead of scrambling data with a reversible cipher. It is a practical way to apply data minimization to every AI prompt you send.
Is ChatDataMask a GDPR or EU AI Act compliance tool?
ChatDataMask supports your GDPR and EU AI Act workflow by keeping personal data out of AI prompts through local masking. It is a technical safeguard, not a legal compliance certification, so always confirm the fit with your organization's data protection officer.
Can ChatDataMask replace enterprise DLP software?
No. ChatDataMask is a lightweight, local data loss prevention layer for individual AI conversations, not a replacement for enterprise DLP, SIEM, or network-level monitoring. It closes the specific gap of PII leaking into ChatGPT, Claude, and similar AI tools.