Overview
Keep secrets out of AI prompts. Detect and redact sensitive data before sending.
š¦ Prompt Seal ā Keep secrets out of AI prompts. Prompt Seal is a free, local-first browser extension that detects and redacts sensitive data before you send prompts to AI assistants. š WHAT IT DOES Prompt Seal scans your messages in real time ā before they reach any AI chatbot. If it finds API keys, passwords, tokens, or personal data, it blocks the send and lets you review or auto-redact. ā” DETECTION ENGINE ā¢ 85 regex patterns covering cloud credentials, API keys, auth tokens, database URLs, private keys, webhooks, and package registry tokens ā¢ 13 Shannon entropy detectors ā catches unknown secrets in ENV files, JSON, YAML, TOML, XML, CLI flags, URLs, base64, hex strings, and PEM keys ā¢ PII protection ā credit cards, SSNs, IBANs, passport numbers, phone numbers, and email+password combos ā¢ Smart filtering ā structural fields, well-known annotations, and low-entropy values are excluded to minimize false positives š”ļø HOW IT WORKS 1. Type your prompt ā write normally in any supported AI chat 2. Seal scans instantly ā 85+ patterns and entropy analysis check every character before the message sends 3. Threats neutralized ā get a warning modal with details, or enable auto-redact for zero-friction protection Secrets are replaced with [REDACTED] tags. You choose: Cancel, Send Anyway, or Redact & Send. š 12 LANGUAGES Auto-detected from your browser settings. All UI elements ā popup, modal, warnings, severity labels ā are fully translated. āļø FEATURES ā¢ Real-time scanning with MutationObserver + event listeners + polling fallback ā¢ Send interception on Enter key, click, and form submit (capture phase) ā¢ Warning modal in isolated Shadow DOM (won't break page styles) ā¢ Auto-redact mode ā secrets replaced silently, message sent automatically ā¢ Floating indicator badge with secret count (š¦) ā¢ Light and dark theme ā¢ Protection toggle ā¢ Scan statistics (total scans, threats blocked) š PRIVACY ā¢ 100% local ā all scanning runs in your browser ā¢ Zero data collection ā no analytics, no tracking, no cookies ā¢ No backend ā no servers, no cloud APIs, no external requests ā¢ No prompt storage ā scanned content is never saved ā¢ Permissions: storage + activeTab only ā¢ No telemetry. Ever. Built for developers and security-conscious teams who use AI tools daily.
Details
- Version1.1.0
- UpdatedMay 13, 2026
- Size202KiB
- LanguagesEnglish
- DeveloperWebsite
Email
contact@alekseialeinikov.com - Non-traderThis developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.
Privacy
This developer declares that your data is
- Not being sold to third parties, outside of the approved use cases
- Not being used or transferred for purposes that are unrelated to the item's core functionality
- Not being used or transferred to determine creditworthiness or for lending purposes
