Rehydra

Detects and reversibly anonymizes PII and secrets before they reach an LLM, then rehydrates on the way back.

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Rehydra is a free, open-source tool that detects personal data and secrets in prompts sent to LLMs and replaces them with reversible placeholders, restoring the real values only when a tool call or file write actually needs them. It runs on-device with no cloud calls, and ships as a CLI proxy for coding agents, a Chrome extension for ChatGPT and Gemini, and an embeddable library. It's aimed at developers and privacy-conscious users who work with sensitive data through LLM-based tools.

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