Microsoft Presidio
FreeOpen-source PII detection and anonymization for text and images.
Tool Info
Categories
Guardrails · Security
Developer
Microsoft
License
Open Source
Official Website
Repository
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
Community Insights
Real implementation experiences shared by AI practitioners.
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Related Tools
Alternatives
Tags
#security#pii#privacy
Related Guides
- AI Security
Threat modeling for LLM apps — prompt injection, tool abuse, data exfiltration, and defenses with guardrails, privilege separation, and red teaming.
- Guardrails
Safety constraints and validation on AI inputs and outputs — content filters, schema checks, and policy enforcement in agent and app pipelines.
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