Run Your Own ChatGPT Offline: Open WebUI + Ollama + Local Knowledge Base

“The future of AI will be hybrid: local intelligence with cloud augmentation.” - Satya Nadella When it comes to running AI assistants privately and offline, you have two main paths: use cloud-hosted LLM APIs like OpenAI or Anthropic, or run models locally on your own machine. Both approaches are valid, but in this article, we’ll focus on building a fully local AI assistant using Open WebUI and Ollama. Why Local AI? Because it gives you full privacy, offline access, zero API cost per token, and control over your models and data - especially important for sensitive documents or internal knowledge bases. As a practical example, we’ll build a local assistant that can answer questions from your own documents (PDFs, notes, markdown files) using a local RAG (Retrieval-Augmented Generation) pipeline. What Is Open WebUI? Open WebUI is a self-hosted web interface for local LLMs. It provides a ChatGPT-like experience in your browser while running models entirely on your own hardware via Ollama. K