Paperless-NGX & Paperless-AI:
Document Management with Local AI

The flood of paper in companies is enormous: invoices, contracts, quotes, delivery notes, correspondence — countless documents land in inboxes every day. According to a study by Bitkom, employees in Germany spend an average of 40 minutes per day searching for documents. That equates to nearly 150 hours per year — or four full working weeks.

Paperless-NGX tackles this problem radically: The open-source document management system (DMS) automates the detection, tagging, and archiving of documents. Combined with local AI models, it becomes an intelligent system that not only stores documents but also understands, categorizes, and makes them searchable — all GDPR-compliant on your own infrastructure.

In this article, you will learn why Paperless-NGX is the gold standard for self-hosted DMS, how local AI models like Ollama and Paperless-AI are revolutionizing document processing, and how to free your business from the paper flood — with measurable savings of up to 80 % of manual document work.

What is Paperless-NGX?

Paperless-NGX is a self-hosted document management system that automatically scans, classifies, and archives documents. It was developed as a fork of the original Paperless project and has become the go-to solution for privacy-compliant DMS in the open-source world.

At its core is a powerful OCR engine (Optical Character Recognition) that transforms even handwritten notes and scanned documents into searchable text. Paperless-NGX supports over 100 languages and automatically detects the correct language of each document.

Key Features at a Glance

• Automatic OCR: Extracts text from scanned PDFs, images, and photos — even handwritten content is captured.
• Intelligent Tagging: Documents are automatically categorized and tagged using custom rules ('Correspondent' and 'Document Type' detection).
• Full-Text Search: Thanks to PostgreSQL integration, full-text search is lightning fast — find any document in seconds.
• REST API: Complete API for integration into existing workflows and third-party systems.
• Multi-User Capability: Multiple users with individual permissions and separate document areas.
• Email Integration: Import documents directly from email attachments and process them automatically.
• Mobile Apps: Official apps for iOS and Android for scanning and uploading on the go.
• Consumption Template System: Powerful rules for automatic processing of incoming documents.

Local AI as a Game-Changer: Paperless-AI, Ollama & RAG Chat

The real revolution begins where Paperless-NGX meets local artificial intelligence. While the integrated OCR already does an excellent job, AI extensions like Paperless-AI and Paperless-GPT open entirely new dimensions of document processing.

Paperless-AI: Smart Document Classification

Paperless-AI is an extension that uses machine learning to classify documents even more precisely. Unlike rule-based consumption templates, Paperless-AI learns from your previous classifications and becomes more accurate over time. The AI automatically recognizes:

• Document Types: Invoice, quote, contract, delivery note, reminder, correspondence — the AI distinguishes them reliably.
• Sender and Recipient: Even with unknown senders, the AI identifies the correct correspondent based on layout and text structure.
• Key Fields: Invoice number, amount, date, tax ID — key fields are automatically extracted.
• Tags and Categories: The AI suggests appropriate tags and learns from your confirmation or correction.

Ollama: Local LLMs for Maximum Data Sovereignty

The decisive advantage of the NOVA DIGITAL approach: All AI models run locally. With Ollama, you operate Large Language Models like Llama 3, Mistral, or Phi on your own hardware — no data leaves your network. This is not only GDPR-compliant but also more secure and, in the long run, more cost-effective than cloud API solutions.

• Complete Data Control: All sensitive documents and AI requests stay within your infrastructure.
• No API Costs: After initial setup, there are no recurring costs per document or API call.
• Offline Capable: The system works without an internet connection — ideal for companies with strict security policies.
• Model Variety: Choose from hundreds of open-source models the one that fits your requirements.

RAG Chat: Talk to Your Documents

Perhaps the most innovative feature is the RAG Chat (Retrieval-Augmented Generation). Imagine being able to ask your document system questions like:

• "When does our office lease contract in Munich expire?"
• "What was the total revenue last quarter according to the booked invoices?"
• "What are the insurance conditions for our business liability coverage?"

The RAG Chat searches your entire document archive, extracts the relevant passages, and delivers precise answers — in natural language, with source citations. The system combines Paperless-NGX's full-text search with the semantic analysis of local LLMs and generates summaries, extractions, and analyses at the click of a button.

Benefits for Businesses

The combination of Paperless-NGX and local AI offers tangible, measurable benefits for companies of all sizes. Here are the most important ones:

Data Protection & GDPR Compliance

In times of strict data protection regulations, local processing of sensitive documents is a decisive advantage. Unlike cloud services such as Dropbox, Google Drive, or DocuSign, your documents never leave your infrastructure. Paperless-NGX also supports:

• Encryption of the database and document storage
• Audit Logs for all accesses and changes
• Granular Permissions per user and document
• Automatic Deletion Policies for GDPR-compliant data retention

Cost Efficiency

A total cost of ownership (TCO) comparison shows: Even an enterprise license for commercial DMS solutions quickly costs 50–150 € per user per month. Paperless-NGX, on the other hand, is completely free (MIT license). The only costs are for infrastructure (server, storage) and one-time setup.

Automation & Productivity

The automation potential is enormous. Companies report the following savings after implementation:

• Up to 80 % less manual document work through automatic classification and OCR
• 90 % faster document search — from an average of 5 minutes to under 30 seconds
• Reduction of processing time for invoice approvals from days to hours
• Elimination of printer, paper, and postage costs for document distribution

Scalability

Paperless-NGX scales from a single-user system on a Raspberry Pi to an enterprise cluster processing thousands of documents per day. The Docker-based architecture enables easy horizontal scaling and load balancing.

Technical Architecture: Docker-Compose in Focus

Paperless-NGX is typically installed via Docker-Compose. The architecture is modular and consists of several interconnected containers:

Base Stack (Minimum)

• Paperless-NGX (Webserver + Worker): The main application with web UI, REST API, and background workers for document processing.
• PostgreSQL: Database for metadata, full-text index, and user management. Significantly more powerful than the previously used SQLite.
• Redis: Message broker for the task queue (Celery). Enables asynchronous processing and load distribution.
• Nginx (optional): Reverse proxy for SSL termination and load balancing.

Optional AI Stack

• Ollama: Local LLM server for AI-powered document analysis. Runs on CPU or GPU (CUDA/ROCm).
• Paperless-AI / Paperless-GPT: AI extension that analyzes and classifies documents via the Paperless API.
• OpenAI-compatible API (optional): For heterogeneous environments that support different AI backends.
• Watchtower (optional): Automatic updates of Docker containers for security patches.

# docker-compose.yml — Minimal Paperless-NGX Setup
version: "3.9"
services:
  paperless-webserver:
    image: ghcr.io/paperless-ngx/paperless-ngx:latest
    ports:
      - "8080:8000"
    volumes:
      - ./data:/usr/src/paperless/data
      - ./media:/usr/src/paperless/media
      - ./export:/usr/src/paperless/export
      - ./consume:/usr/src/paperless/consume
    env_file: docker-compose.env
    depends_on:
      - postgres
      - redis
  paperless-worker:
    image: ghcr.io/paperless-ngx/paperless-ngx:latest
    command: ["celery", "-A", "paperless", "worker", "-l", "info"]
    volumes:
      - ./data:/usr/src/paperless/data
      - ./media:/usr/src/paperless/media
      - ./consume:/usr/src/paperless/consume
    env_file: docker-compose.env
    depends_on:
      - postgres
      - redis

  postgres:
    image: postgres:16-alpine
    volumes:
      - ./postgres:/var/lib/postgresql/data
    environment:
      POSTGRES_DB: paperless
      POSTGRES_USER: paperless
      POSTGRES_PASSWORD: ${DB_PASSWORD}

  redis:
    image: redis:7-alpine

  ollama:
    image: ollama/ollama:latest
    volumes:
      - ./ollama:/root/.ollama
    deploy:
      resources:
        reservations:
          devices:
            - driver: nvidia
              count: 1
              capabilities: [gpu]

Thanks to the well-thought-out Docker setup, installation is completed in less than an hour. After starting, you configure your consumption templates via the web interface, define document types and correspondents, and can immediately begin document processing.

Conclusion: Paperless, Intelligent, and Future-Proof

The combination of Paperless-NGX and local AI models represents the gold standard for privacy-compliant document management. While Paperless-NGX already provides an excellent DMS foundation with its mature OCR engine, flexible tagging, and powerful API, extensions like Paperless-AI and Ollama elevate the system to an entirely new level.

Companies that implement this stack benefit from:

• Up to 80 % less manual document work through end-to-end automation
• Full GDPR compliance through local processing of all sensitive data
• Massive cost savings compared to commercial DMS solutions (50–150 €/User/Month vs. one-time setup costs)
• AI-powered full-text search and RAG Chat for unprecedented document intelligence
• Scalability from a Raspberry Pi home office to enterprise clusters

The question is no longer whether your business should switch to digital document management — but how quickly you can leverage the enormous productivity and cost advantages of Paperless-NGX and local AI.

NOVA DIGITAL is happy to support you in planning, implementing, and optimizing your Paperless-NGX environment — from initial analysis to production operation with an AI stack.