Chrome extension · free
Your secrets never
reach the model.
LLM Masker catches API keys, credentials, cards, emails and phone numbers in your prompt — and masks them on your device, the moment before you hit send. No account. No servers reading your text. No setup.
100% on-device
ChatGPT
Claude
Gemini
Copilot
DeepSeek
Perplexity
Google AI Mode
Paste freely. Send safely.
You paste a config file into a chat to debug it — and your AWS secret goes along for the ride. LLM Masker intercepts the prompt right in your browser, swaps anything sensitive for a safe placeholder, and lets the rest through untouched. The AI still gets the context it needs; it just never sees the parts it shouldn't.
- Detects OpenAI / Anthropic / Google API keys, AWS credentials, JWT tokens, emails, phone numbers, Luhn-valid card numbers and US SSNs.
- Masks before send — on paste, on Enter, on the send button.
- Proves it — a local dashboard shows every mask it made, with nothing sensitive stored.