Nanobrowser is an open-source AI web automation tool that runs in your browser. A free alternative to OpenAI Operator with flexible LLM options and multi-agent system.
⬇️ Get Nanobrowser from Chrome Web Store for free
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❤️ Support the project by sponsoring us - every contribution helps keep Nanobrowser free and open source!
Nanobrowser's multi-agent system analyzing HuggingFace in real-time, with the Planner intelligently self-correcting when encountering obstacles and dynamically instructing the Navigator to adjust its approach—all running locally in your browser.
Looking for a powerful AI browser agent without the $200/month price tag of OpenAI Operator? Nanobrowser , as a chrome extension, delivers premium web automation capabilities while keeping you in complete control:
- 100% Free - No subscription fees or hidden costs. Just install and use your own API keys, and you only pay what you use with your own API keys.
- Privacy-Focused - Everything runs in your local browser. Your credentials stay with you, never shared with any cloud service.
- Flexible LLM Options - Connect to your preferred LLM providers with the freedom to choose different models for different agents.
- Fully Open Source - Complete transparency in how your browser is automated. No black boxes or hidden processes.
Note: We currently support OpenAI, Anthropic, Gemini, Ollama, Groq, Cerebras, Llama and custom OpenAI-Compatible providers, more providers will be supported.
- Multi-agent System: Specialized AI agents collaborate to accomplish complex web workflows
- Interactive Side Panel: Intuitive chat interface with real-time status updates
- Task Automation: Seamlessly automate repetitive web automation tasks across websites
- Follow-up Questions: Ask contextual follow-up questions about completed tasks
- Conversation History: Easily access and manage your AI agent interaction history
- Multiple LLM Support: Connect your preferred LLM providers and assign different models to different agents
Officially Supported:
- Chrome - Full support with all features
- Edge - Full support with all features
Not Supported:
- Firefox, Safari, and other Chromium variants (Opera, Arc, etc.)
Note: While Nanobrowser may function on other Chromium-based browsers, we recommend using Chrome or Edge for the best experience and guaranteed compatibility.
- Install from Chrome Web Store (Stable Version):
- Visit the Nanobrowser Chrome Web Store page
- Click "Add to Chrome" button
- Confirm the installation when prompted
Important Note: For latest features, install from "Manually Install Latest Version" below, as Chrome Web Store version may be delayed due to review process.
- Configure Agent Models:
- Click the Nanobrowser icon in your toolbar to open the sidebar
- Click the
Settingsicon (top right) - Add your LLM API keys
- Choose which model to use for different agents (Navigator, Planner)
To get the most recent version with all the latest features:
-
Download
- Download the latest
nanobrowser.zipfile from the official Github release page.
- Download the latest
-
Install:
- Unzip
nanobrowser.zip. - Open
chrome://extensions/in Chrome - Enable
Developer mode(top right) - Click
Load unpacked(top left) - Select the unzipped
nanobrowserfolder.
- Unzip
-
Configure Agent Models
- Click the Nanobrowser icon in your toolbar to open the sidebar
- Click the
Settingsicon (top right). - Add your LLM API keys.
- Choose which model to use for different agents (Navigator, Planner)
-
Upgrading:
- Download the latest
nanobrowser.zipfile from the release page. - Unzip and replace your existing Nanobrowser files with the new ones.
- Go to
chrome://extensions/in Chrome and click the refresh icon on the Nanobrowser card.
- Download the latest
If you prefer to build Nanobrowser yourself, follow these steps:
-
Prerequisites:
-
Clone the Repository:
git clone https://github.com/nanobrowser/nanobrowser.git cd nanobrowser -
Install Dependencies:
pnpm install
-
Build the Extension:
pnpm build
-
Load the Extension:
- The built extension will be in the
distdirectory - Follow the installation steps from the Manually Install section to load the extension into your browser
- The built extension will be in the
-
Development Mode (optional):
pnpm dev
Nanobrowser allows you to configure different LLM models for each agent to balance performance and cost. Here are recommended configurations:
- Planner: Claude Sonnet 4
- Better reasoning and planning capabilities
- Navigator: Claude Haiku 3.5
- Efficient for web navigation tasks
- Good balance of performance and cost
- Planner: Claude Haiku or GPT-4o
- Reasonable performance at lower cost
- May require more iterations for complex tasks
- Navigator: Gemini 2.5 Flash or GPT-4o-mini
- Lightweight and cost-efficient
- Suitable for basic navigation tasks
-
Setup Options:
- Use Ollama or other custom OpenAI-compatible providers to run models locally
- Zero API costs and complete privacy with no data leaving your machine
-
Recommended Models:
- Qwen3-30B-A3B-Instruct-2507
- Falcon3 10B
- Qwen 2.5 Coder 14B
- Mistral Small 24B
- Latest test results from community
- We welcome community experience sharing with other local models in our Discord
-
Prompt Engineering:
- Local models require more specific and cleaner prompts
- Avoid high-level, ambiguous commands
- Break complex tasks into clear, detailed steps
- Provide explicit context and constraints
Note: The cost-effective configuration may produce less stable outputs and require more iterations for complex tasks.
Tip: Feel free to experiment with your own model configurations! Found a great combination? Share it with the community in our Discord to help others optimize their setup.
Here are some powerful tasks you can accomplish with just a sentence:
-
News Summary:
"Go to TechCrunch and extract top 10 headlines from the last 24 hours"
-
GitHub Research:
"Look for the trending Python repositories on GitHub with most stars"
-
Shopping Research:
"Find a portable Bluetooth speaker on Amazon with a water-resistant design, under $50. It should have a minimum battery life of 10 hours"
from https://github.com/nanobrowser/nanobrowser
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