Detect and mask PII for GDPR-safe AI document analysis with Anthropic and PostgreSQL

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1. Workflow Overview

Overview This workflow enables GDPR compliant document processing by detecting, masking, and securely handling personally identifiable information (PII) before AI analysis. It ensures that sensitiv...

Best for

Document Extraction automation workflows
AI Summarization automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.webhook, n8n-nodes-base.set, n8n-nodes-base.code, @n8n/n8n-nodes-langchain.agent, @n8n/n8n-nodes-langchain.lmchatanthropic, @n8n/n8n-nodes-langchain.outputparserstructured, n8n-nodes-base.merge, n8n-nodes-base.postgres

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by ResilNext.

Original n8n.io source

1.1 Workflow description

Title: Detect and mask PII for GDPR-safe AI document analysis with Anthropic and PostgreSQL
Workflow name: Detect and mask PII for GDPR-safe AI document analysis with Anthropic and PostgreSQL

Overview

This workflow enables GDPR-compliant document processing by detecting, masking, and securely handling personally identifiable information (PII) before AI analysis.

It ensures that sensitive data is never exposed to AI systems by replacing it with tokens, while still allowing controlled re-injection of original values when permitted. The workflow also maintains full audit logs for compliance and traceability.

How It Works

Document Upload & Configuration Receives documents via webhook and initializes configuration such as document ID, thresholds, and database tables.
Text Extraction Extracts raw text from uploaded documents for processing.
Multi-Detector PII Detection Detects emails, phone numbers, ID numbers, and addresses using regex and AI-based detection.
PII Aggregation & Conflict Resolution Merges detections, resolves overlaps, removes duplicates, and builds a unified PII map.
Tokenization & Vault Storage Replaces sensitive data with secure tokens and stores original values in a database vault.
Masking & Validation Generates masked text and verifies that all PII has been successfully removed before AI processing.
AI Processing (Masked Data) Processes the document using AI while preserving tokens to prevent exposure of sensitive information.
Re-Injection Controller Determines which fields are allowed to restore original PII based on permissions.
Secure Retrieval & Restoration Retrieves original values from the vault and restores them only where permitted.
Audit Logging Stores metadata, detected PII types, and re-injection events for compliance tracking.
Error Handling & Alerts Blocks processing and triggers alerts if masking fails or compliance rules are violated.

Setup Instructions

Activate the webhook and upload a document (PDF or supported file)
Configure AI credentials (Anthropic / OpenAI)
Set database credentials for PII vault and audit logs
Adjust detection thresholds and compliance settings if needed
Execute the workflow and review outputs and logs

Use Cases

GDPR-compliant document processing pipelines
Secure AI document analysis with PII protection
Automated redaction and tokenization systems
Financial, legal, or healthcare document processing
Privacy-first AI workflows for sensitive data

Requirements

n8n (latest version recommended)
Anthropic or OpenAI API credentials
PostgreSQL (or compatible database) for vault and audit logs
Input documents (PDF or text-based files)

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Document Upload Webhook

Type / Role: n8n-nodes-base.webhook - webhook
Config choices: Version 2.1

Block 2 - Workflow Configuration

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 3 - Email Detector

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 4 - Phone Detector

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 5 - ID Number Detector

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 6 - Address Detector AI

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 3

Block 7 - Anthropic Chat Model

Type / Role: @n8n/n8n-nodes-langchain.lmChatAnthropic - lmChatAnthropic
Config choices: Version 1.3

Block 8 - Address Output Parser

Type / Role: @n8n/n8n-nodes-langchain.outputParserStructured - outputParserStructured
Config choices: Version 1.3

Block 9 - Merge PII Detections

Type / Role: n8n-nodes-base.merge - merge
Config choices: Version 3.2

Block 10 - PII Consolidation & Conflict Resolver

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 11 - Tokenization & Vault Storage

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 12 - Store Tokens in Vault

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2.6

Block 13 - Generate Masked Text

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 14 - AI Processing (Masked Data)

Type / Role: @n8n/n8n-nodes-langchain.agent - agent
Config choices: Version 3

Block 15 - AI Processing Model

Type / Role: @n8n/n8n-nodes-langchain.lmChatAnthropic - lmChatAnthropic
Config choices: Version 1.3

Block 16 - AI Output Parser

Type / Role: @n8n/n8n-nodes-langchain.outputParserStructured - outputParserStructured
Config choices: Version 1.3

Block 17 - Re-Injection Controller

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 18 - Retrieve Original Values

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2.6

Block 19 - Restore Original PII

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 20 - Store Audit Log

Type / Role: n8n-nodes-base.postgres - postgres
Config choices: Version 2.6

Block 21 - Masking Success Check

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.3

Block 22 - Block AI Processing

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 23 - Send Alert Notification

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.3

Block 24 - Sticky Note1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Showing the first 24 of 37 workflow blocks. Download the JSON for the full node graph.

3. Summary Table

Workflow	Detect and mask PII for GDPR-safe AI document analysis with Anthropic and PostgreSQL
Complexity	advanced
Nodes	37
Categories	Document Extraction, AI Summarization
Author	ResilNext
Published	25 Mar 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/14320/14320.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Document Extraction workflows AI Summarization workflows

Frequently asked questions

What does Detect and mask PII for GDPR-safe AI document analysis with Anthropic and PostgreSQL do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Document Extraction, AI Summarization use case.

ResilNext

33 workflows

Nodes

n8n-nodes-base.webhook n8n-nodes-base.set n8n-nodes-base.code @n8n/n8n-nodes-langchain.agent @n8n/n8n-nodes-langchain.lmchatanthropic @n8n/n8n-nodes-langchain.outputparserstructured n8n-nodes-base.merge n8n-nodes-base.postgres

Complexity

advanced

Published 25 Mar 2026

Likes 0

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Install path: /data/workflows/14320/14320.json

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Detect and mask PII for GDPR-safe AI document analysis with Anthropic and PostgreSQL

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Overview

How It Works

Setup Instructions

Use Cases

Requirements

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Document Upload Webhook

Block 2 - Workflow Configuration

Block 3 - Email Detector

Block 4 - Phone Detector

Block 5 - ID Number Detector

Block 6 - Address Detector AI

Block 7 - Anthropic Chat Model

Block 8 - Address Output Parser

Block 9 - Merge PII Detections

Block 10 - PII Consolidation & Conflict Resolver

Block 11 - Tokenization & Vault Storage

Block 12 - Store Tokens in Vault

Block 13 - Generate Masked Text

Block 14 - AI Processing (Masked Data)

Block 15 - AI Processing Model

Block 16 - AI Output Parser

Block 17 - Re-Injection Controller

Block 18 - Retrieve Original Values

Block 19 - Restore Original PII

Block 20 - Store Audit Log

Block 21 - Masking Success Check

Block 22 - Block AI Processing

Block 23 - Send Alert Notification

Block 24 - Sticky Note1

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions