Prompt Seal intercepts your messages before they reach ChatGPT, Claude, Gemini and other AI tools — detecting API keys, passwords, tokens and PII in real time.
Trusted Protection
Capabilities
One lightweight extension. Zero configuration. Covers every major secret format, PII pattern, and entropy anomaly.
AWS, GCP, Azure, GitHub, Stripe, Slack, OpenAI, Anthropic, PEM keys, JWTs, database connection strings and dozens more.
Shannon entropy detection catches unknown secrets across ENV files, JSON, YAML, TOML, XML attributes, CLI flags and URLs.
Credit cards (Visa, MC, Amex), SSN, IBAN, passport numbers, phone numbers, email+password combos — all caught.
English, Русский, Deutsch, Français, Español, Português, Italiano, Ελληνικά, Українська, 日本語, 한국어, 中文.
Enable automatic mode — secrets are instantly replaced with [REDACTED] tags before sending. Zero friction.
All scanning runs in your browser. Zero data leaves your machine. No servers, no telemetry, no analytics. Ever.
Live badge on every page shows how many secrets were detected. Customizable color, toggle on/off anytime.
Pearl, Obsidian, Nord, Sakura, Ocean, Ember — pick the look that fits your style. Syncs across popup and badge.
Simple & Fast
Write your message normally in any supported AI chat. No setup, no config files.
Before the message sends, 110+ patterns and entropy analysis check every character.
Get a warning popup, or let auto-redact replace secrets silently. Your call.
See It In Action
Install Prompt Seal in seconds. Free, works offline. No accounts, no sign-ups, no tracking.
Chrome & Safari • Zero telemetry