FastPII

Protect sensitive information before it reaches AI.

FastPII is an open-source privacy engine that detects, validates, and transforms PII. Deterministic, local, and fast.

Documentation · PyPI · Discussions · Contributing

Install

pip install fastpii

Quick Start

from fastpii import FastPII, DEFAULT_PRIORITY
from fastpii.countries.cz import CzechPack

engine = FastPII(priority=DEFAULT_PRIORITY)
engine.register(CzechPack())

result = engine.detect("Jan Novák, RČ: 800101/1238, IČO: 25596641")
for f in result.findings:
    print(f"{f.type}: {f.value} ({f.confidence:.0%})")

CLI:

fastpii detect "Jan Novák, RČ: 800101/1238" -r cz

Why FastPII

• Built for AI designed for LLM prompts, RAG pipelines, and AI agents
• Deterministic no LLM calls, no cloud dependency, <1ms per detection
• Country-aware checksum validation for official identifiers (Rodné číslo, PESEL, Steuer-ID, SIREN)
• Self-hosted zero external dependencies, runs locally
• Open Source Apache 2.0, fully auditable

Features

• Detect find PII in text with context-aware detection
• Validate verify identifiers with checksum algorithms
• Anonymize replace PII with [REDACTED]
• Redact replace PII with type labels like [EMAIL]
• Mask replace PII with asterisks
• Remove delete PII entirely
• FastAPI drop-in REST API
• LangChain anonymizer and filter for LLM chains
• MCP Model Context Protocol for AI agents
• CLI command-line detection and validation

Country Support

Production

🇨🇿 Czech Republic 15 detectors with checksum validation

Beta

🇵🇱 Poland PESEL, NIP, REGON, phone, postal code, address

🇩🇪 Germany Steuer-ID, USt-IdNr, Handelsregister, phone, postal code, address

🇫🇷 France SIREN, SIRET, INSEE/NIR, phone, postal code, address

Country documentation →

Integrations

from fastpii.integrations.fastapi import create_app
from fastpii.integrations.langchain import PIIAnonymizer
from fastpii.integrations.mcp import MCPServer

Architecture

Your Application
       ↓
    FastPII
       ↓
   Your AI

You configure. It executes. Explicit registration, no hidden defaults.

Documentation

• Getting Started
• API Reference
• Country Packs
• Benchmarks
• Examples
• Architecture
• Migration Guide
• Contributing
• Changelog

Ecosystem

• FastPII Core this repository, Apache 2.0
• Country Intelligence Packs extended data and detection for more countries
• FastPII Secure Chat hosted privacy-first AI chat
• FastPII Enterprise governance, audit trails, compliance

https://fastpii.com

Community

• GitHub Discussions
• GitHub Issues
• Contributing Guide

Contributing

Contributions welcome. Country packs, validators, benchmarks, and documentation.

See CONTRIBUTING.md for setup and guidelines.

License

Apache 2.0. See LICENSE.

Privacy should be a default, not an afterthought.