Everything we know about why anonymization fails.
Guides, regulation-by-regulation readings, honest comparisons and longer articles. Written before there was anything to sell on most of them, and kept because a buyer who is doing their homework deserves better than a brochure. The research hub at anonym.community carries a further 209 pieces and 170 case studies.
Guides
What personal data is, how it is found, and what the removal actually does to a document.
What is PII? Everything You Need to Know
Types of PII data with examples: direct identifiers, quasi-identifiers and sensitive PII, how GDPR, HIPAA and CCPA define them, and how to protect them.
GDPR Data Anonymization Guide
GDPR data anonymization in practice: the key articles, anonymization versus pseudonymization, Recital 26 and a DPO implementation checklist for your team.
Anonymization vs. Pseudonymization vs. Encryption
Anonymization vs. pseudonymization vs. encryption: GDPR definitions (Art. 4), why encrypted data stays personal data, use cases, techniques and examples.
PII Detection Methods: Regex vs NLP vs Hybrid
PII detection methods compared: regex pattern matching, NLP entity recognition and the hybrid approach, with trade-offs and how Presidio combines them.
Accuracy by Design
Engine-specific accuracy profiles and confidence scoring. Hybrid detection pairs checksum-verified patterns with NLP. We publish no accuracy percentage.
PII in LLM Prompts: Risks and Solutions
PII risks in LLM prompts: training data contamination, prompt logging and output leakage. Protection strategies with the MCP server and Chrome extension.
Anonymize Data Before It Reaches the LLM
How to redact PII before a prompt reaches an LLM: MCP Server for Claude Desktop, Chrome extension for ChatGPT and Gemini, and an API for RAG pipelines.
Data Breach Prevention: Why Anonymization is Your Last Line of Defense
How PII anonymization limits the damage of a data breach: five illustrative scenarios in healthcare, education, finance, supply chain and insider threats.
By regulation
GDPR, HIPAA, CCPA, PCI DSS, ISO 27001 and the AI Act, each read for what it requires of anonymization specifically.
GDPR Data Anonymization Guide
GDPR data anonymization in practice: the key articles, anonymization versus pseudonymization, Recital 26 and a DPO implementation checklist for your team.
HIPAA Data Anonymization Guide
HIPAA de-identification in practice: 18 PHI identifiers, Safe Harbor vs Expert Determination methods, 45 CFR § 164.514(b) for protected health information.
CCPA Data Anonymization Guide
CCPA/CPRA data anonymization guide: consumer rights, the 11 categories of personal information, and de-identification methods under California privacy law.
PCI-DSS Data Anonymization Guide
PCI-DSS data anonymization: cardholder data types, Luhn checksum validation, tokenization and encryption, and how proper anonymization reduces PCI scope.
ISO 27001 and Data Anonymization
Data anonymization for ISO 27001 compliance. Relevant Annex A controls (A.5.12, A.5.33, A.8.10, A.8.11, A.8.24), how to implement them, and what to document.
EU AI Act: PII Compliance for AI Builders
EU AI Act high-risk obligations apply from December 2, 2027; fines reach up to €15M or 3% of global turnover. Article 10 data governance and PII duties.
Comparisons
Where we differ from Google Cloud DLP, Nightfall, Strac, BigID, OneTrust and Gretel, and from building it yourself on Presidio — including where they are the better answer.
How We Compare
Side-by-side comparison: anonym.legal and anonym.plus vs Strac, Nightfall AI, Google Cloud DLP and Presidio DIY. Features, pricing, deployment, compliance.
anonym.legal vs Google Cloud DLP
anonym.legal vs Google Cloud DLP: Google's per-gibibyte prices from its own price sheet, token billing, EU hosting, Office integration and local processing.
anonym.legal & anonym.plus vs Nightfall AI
Compare anonym.legal and anonym.plus with Nightfall AI for PII protection: MCP integration, Office add-in, local processing, EU data residency, feature table.
anonym.legal & anonym.plus vs Strac
Detailed comparison of anonym.legal and anonym.plus with Strac: EU data residency, local processing, the Office add-in and reversible anonymization, in a table.
anonym.legal vs Presidio DIY
Microsoft Presidio is free and MIT-licensed; running it is the cost. Compare self-hosting Presidio with anonym.legal, a hosted service built on it, in Germany.
anonym.legal & anonym.plus vs BigID
BigID finds, classifies and governs data across hundreds of systems. anonym.legal and anonym.plus remove personal data from the text in use. Where each fits.
anonym.legal & anonym.plus vs OneTrust
OneTrust runs the privacy programme: consent, governance, risk and discovery. anonym.legal and anonym.plus take personal data out of the text. Where each fits.
anonym.legal & anonym.plus vs Gretel
Gretel generated synthetic data; its site now forwards to NVIDIA. anonym.legal and anonym.plus anonymize the real text, reversibly if you like. Where each fits.
Articles
Longer pieces on the failure modes: shadow AI, prompt leakage, RAG pipelines, the cost of running Presidio yourself.
Shadow AI and PII: How Employees Are Accidentally Sending Sensitive Data to ChatGPT
78% of AI users bring their own AI tools to work. How shadow AI leaks PII, what AI-related data breaches cost, and how the Chrome Extension anonymizes it first.
2026-03-17
How to Protect PII in LLM Prompts: A Developer’s Guide
Step-by-step guide to protecting PII in ChatGPT, Claude and Gemini prompts: MCP server setup, the Chrome extension and reversible encryption for AI use.
2026-03-17
ChatGPT and HIPAA: What Healthcare Organizations Must Know in 2026
OpenAI offers a BAA for ChatGPT Enterprise — but a BAA alone isn't HIPAA compliance. The 3 conditions, the 18 PHI identifiers, and why to anonymize first.
2026-03-17
EU AI Act and PII: What Every AI Builder Must Do Before December 2, 2027
EU AI Act high-risk obligations apply from December 2, 2027, with fines up to €15M or 3%. Article 10 data governance duties and a PII anonymization list.
2026-03-17
AI Training Data Under the GDPR: How to Anonymize Before You Fine-Tune
How to anonymize AI training data for GDPR Article 5 and EU AI Act Article 10: a practical guide for ML engineers with a 5-step anonymization pipeline.
2026-03-17
GDPR Data Minimization: Articles 5, 25 & 32 Implementation Guide
GDPR data minimization in practice: Articles 5(1)(c), 25 and 32 explained with implementation steps, a DPO checklist and a piisafe.eu website audit flow.
2026-03-17
HIPAA Safe Harbor De-identification: Complete Guide to 18 PHI Identifiers
HIPAA Safe Harbor de-identification guide: the 18 PHI identifiers, 45 CFR § 164.514(b), and the limits of automated detection when applying the method.
2026-03-17
MCP Server PII Protection: Keep Data Private in Claude Desktop & Cursor
Complete MCP Server setup guide for PII protection in Claude Desktop, Cursor, and VS Code. 9 tools: analyze, anonymize, detokenize, image redaction and more.
2026-03-17
PCI-DSS Scope Reduction Through Tokenization: Cut Your Compliance Burden
How PCI-DSS tokenization reduces your compliance scope. Luhn checksum validation, tokenization vs encryption vs masking, and scope reduction strategies.
2026-03-17
Consistent Pseudonymization for RAG Pipelines: Protect PII Without Breaking Retrieval
How to implement consistent pseudonymization for RAG pipelines. The same entity always maps to the same token, so retrieval can link it across your documents.
2026-03-17
The True Cost of Hosting Microsoft Presidio: 12-Month TCO Analysis
12-month TCO analysis for self-hosting Microsoft Presidio: setup time, monthly maintenance hours, infrastructure costs and the hidden costs of running it.
2026-03-17
Microsoft Presidio vs Managed PII Service: Effort and Pricing in 2026
Is Microsoft Presidio free? The library is, under MIT; running it is not. Self-hosted Presidio vs a managed PII service: effort, pricing, when each fits.
2026-03-17
Top 7 Google Cloud DLP Alternatives in 2026 (Detailed Comparison)
Top 7 Google Cloud DLP alternatives in 2026. Compare anonymize.solutions, Nightfall AI, Strac, Microsoft Purview, Varonis, Forcepoint and Symantec DLP.
2026-03-17
Top 7 Nightfall AI Alternatives in 2026 (Detailed Comparison)
Top 7 Nightfall AI alternatives in 2026, compared in detail: anonymize.solutions, Strac, Google DLP, Microsoft Purview, Varonis, Forcepoint and Symantec.
2026-03-17
Top 7 Strac Alternatives in 2026 (Detailed Comparison)
Top 7 Strac alternatives in 2026. Compare anonymize.solutions, Nightfall AI, Google DLP, Microsoft Purview, Varonis, Forcepoint and Symantec side by side.
2026-03-17
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