Protect you from copying sensitive data to AI (github.com)

Prompt Security is a new, open-source Go utility that watches your system clipboard in real time and automatically detects and filters sensitive data before you paste it into LLMs or online tools. It’s a blazing-fast, zero-config tool (installable via go install or build-from-source) that replaces or masks email addresses, phone numbers, credit card numbers, SSNs, IPv4 addresses and user-defined exact-match patterns. It includes a small web GUI for configuration and log monitoring, configurable rules and safe placeholder replacements, and runs cross-platform (Windows, macOS, Linux). For AI/ML practitioners and security teams this matters because copy-paste is a common, high-risk vector for leaking proprietary code, customer PII, or credentials into ChatGPT, Copilot, Gemini or web UIs. All processing is local—no network uploads—so sensitive content never leaves the machine, and the MIT-licensed codebase is fully auditable for compliance. The tool is useful for developers using LLMs for code review or documentation, security teams enforcing clipboard policies, and power users handling confidential information, offering an easy way to reduce accidental data exfiltration without changing workflows.