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Microsoft Presidio

Free

Open-source PII detection and anonymization for text and images.

Open SourceSelf-hostedPython SDK

Tool Info

Categories
Guardrails · Security
Developer
Microsoft
License
Open Source
Official Website
microsoft.github.io/presidio
Repository
microsoft/presidio
Official Docs

Overview

Presidio detects and anonymizes personally identifiable information in text.

It is commonly placed before LLM calls to prevent PII leakage.

Complements LLM guardrails with data privacy controls.

Features

  • PII entity detection
  • Anonymization operators
  • Custom recognizers
  • Multi-language support

Pricing

Free tier available
Free (open source)

Pros

  • Battle-tested PII detection
  • Pluggable architecture
  • Microsoft maintained

Best For

PII redaction in LLM pipelinesGDPR complianceData anonymization

When NOT to Use

  • Not LLM-specific
  • Requires integration work

Typical Users

Data engineersCompliance teamsHealthcare AI builders

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Alternatives

Guardrails AI
Open-source framework for validating and structuring LLM inputs and outputs.
Lakera
AI security platform for prompt injection detection and LLM firewall protection.

Tags

#security#pii#privacy

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