open-source
anonymize.legal vs Microsoft Presidio
Side-by-side comparison of PII anonymization capabilities, updated March 2026.
Feature Comparison
| Feature | anonymize.legal | Microsoft Presidio |
|---|---|---|
| Entity Types | 285+ | ~20 default |
| Languages | 48 | 6 |
| Detection | Hybrid (spaCy + Stanza + XLM-RoBERTa + regex) | NER (spaCy/Stanza/Transformers) + regex |
| Methods | Replace, Mask, Redact, Hash, Encrypt, Custom | Redact, Replace, Mask, Hash, Encrypt |
| Deployment | Web, Desktop, Office, Chrome, MCP, API, LibreOffice | Self-hosted, Docker, API |
| File Formats | Text, PDF, DOCX, XLSX, CSV, Images, JSON | Text, CSV, Images |
| Compliance | GDPR, HIPAA, CCPA, FOIA, PCI-DSS, ISO 27001 | None listed |
| Air-Gap | Yes (Desktop App) | Yes |
| Pricing | Free tier (200 tokens/mo) | Free ($0 + engineering) |
| Zero-Knowledge | Yes (Argon2id + AES-256-GCM) | No |
Microsoft Presidio Strengths
- Microsoft-backed open-source with active community
- Extensible recognizer framework for custom entities
- Image redaction via Tesseract OCR
- Used as detection backend by multiple platforms
- Well-documented Python SDK
Microsoft Presidio Limitations
- Only ~20 default entity types
- Limited language models (6–8 languages)
- No native PDF/DOCX processing
- No GUI or desktop application
- Requires Python engineering to deploy
Why Choose anonymize.legal
- 285+ entity types vs ~20 default
- 48 languages vs 6
- 7 platforms (Web, Desktop, Office, Chrome, LibreOffice, MCP, API)
- Zero-knowledge encryption — vendor cannot access your data
- Free tier available — no credit card required