Automate Legal Document Review with AI and Google Sheets

Transform Legal Document Processing with AI-Powered Automation

Stop wasting hours on manual document review. This n8n workflow automatically processes contracts, invoices, and NDAs using Claude Sonnet 4.6 AI, extracting key data, classifying risk levels, and logging everything to Google Sheets for compliance tracking—all before a human ever touches the file.

What This Workflow Does

Built for legal and financial teams who need consistent, scalable document processing, this automation operates through six intelligent stages:

• Smart Ingestion: Webhook receives documents and validates payloads, automatically rejecting duplicates using SHA-256 fingerprinting within 30-day windows
• Secure Document Acquisition: Processes both URL submissions (with SSRF protection blocking private IP ranges) and inline text, handling files up to 10MB with built-in PDF text extraction
• AI-Powered Analysis: Claude Sonnet 4.6 extracts structured data and performs risk classification using prompt-injection defenses and document delimiters for security
• Automated Logging: Results flow directly to Google Sheets for compliance audit trails and centralized tracking
• Instant Alerts: Critical findings trigger immediate Slack notifications and email alerts to relevant stakeholders

Use Cases

• Contract Management: Automatically extract key terms, dates, and obligations from vendor agreements and client contracts
• Invoice Processing: Classify payment terms, validate amounts, and flag discrepancies before approval workflows
• Compliance Monitoring: Screen NDAs and legal documents for risk factors and regulatory requirements
• Document Triage: Route high-priority or high-risk documents to appropriate legal reviewers based on AI classification

Technical Details

This workflow leverages essential n8n nodes including webhook triggers, conditional if statements, set nodes for data manipulation, code execution for custom logic, Slack integration for team notifications, and email send functionality. The automation integrates seamlessly with Google Sheets for audit logging and uses Claude Sonnet 4.6 via the Basic LLM Chain for intelligent document analysis.

Perfect for legal teams, financial departments, and compliance officers seeking to eliminate manual document review bottlenecks while maintaining accuracy and audit trails.