How to redact PII before sending data to an LLM

Why redact

Anything you put in a prompt may be logged or leave your boundary. Redacting PII (and secrets) before the model sees it is a baseline privacy control — and often a compliance requirement.

The pattern

1. Detect entities (names, emails, phone numbers, IDs, secrets) with an NER/redaction tool.
2. Replace them with placeholders before the prompt.
3. Optionally re-insert real values in the response after the model returns.

Free tools on ai-supply

PII/PHI redaction and secret-detection capabilities are published as guardrails and NLP tools, each security-scanned with a score and grade. Browse the cybersecurity and nlp categories.

Make redaction a required step in your pipeline — find vetted tools on the catalog.