How to Use Open WebUI to Chat with Local AI Models: A Complete Guide

Running local models is powerful, but raw command lines get old fast. Open WebUI gives you a polished chat interface for your own models, running entirely on your machine. This guide walks you from installation to daily use.

What Is Open WebUI?

Open WebUI is a self-hosted web interface for large language models. It supports multiple backends, conversation history, document upload, and multi-user access. Think of it as a private ChatGPT you fully control, with no data leaving your server.

Step 1: Install Open WebUI

The easiest route is Docker. Run the container with the included command, map a port, and open it in your browser. Open WebUI will launch a setup screen where you create the first administrator account, which then unlocks model management and settings.

Step 2: Connect a Model Backend

Point Open WebUI at a local server such as Ollama, or an OpenAI-compatible API. Enter the connection URL in the settings panel and save. Your available models appear in the top selector; pull or load a model first so there is something to chat with.

Step 3: Start a Conversation

Pick a model, type your prompt, and chat as you would with any assistant. Conversations are saved automatically. Use the sidebar to revisit past chats, and start new threads to keep unrelated topics separate. Open WebUI makes this feel just like a hosted product.

Step 4: Upload Documents and Use RAG

Attach files to a chat or build a document collection, and let Open WebUI retrieve relevant chunks before answering. This gives you grounded answers from your own files. Configure the embedding model in settings to control how documents are indexed and searched.

Step 5: Customize Models and Prompts

Create model presets with system prompts, temperature, and parameters tuned to a task. Save a “coding” preset and a “writing” preset so you switch instantly. Presets in Open WebUI save you from re-entering the same settings every session.

Step 6: Manage Users and Access

Invite teammates and set roles so each person gets the right access. Because Open WebUI is self-hosted, you decide who can see which models and documents. Back up the data volume regularly to protect your conversations and settings.

Tips for Daily Use

Match model size to your hardware, keep prompts specific, and use presets for repeat tasks. Verify important facts, since local models vary widely. Configured well, Open WebUI is a durable, private alternative to cloud chat apps.

Conclusion

Open WebUI turns local models into a friendly, multi-user chat platform. Install it with Docker, connect a backend, and start chatting with your own documents. You get privacy and control without sacrificing usability.