How to Use Merlin AI in 2026: Step-by-Step Guide
Merlin is a browser extension that brings AI assistants to any webpage. Highlight text and ask questions, summarize YouTube videos or articles, generate email replies in Gmail, and chat with GPT-4, Claude, and Gemini without leaving your browser.
Merlin, built by Foyer Technologies, is one of the most widely installed AI browser extensions, with over 10 million users as of 2025. It works as a persistent AI layer across your browser, accessible via keyboard shortcut or by selecting text on any page.
The core use case is contextual AI: rather than switching tabs to ChatGPT, you can invoke Merlin directly while reading an article, reviewing a document, or composing an email. It supports multiple underlying models, including GPT-4o, Claude 3 Opus, Gemini 1.5 Pro, and several others, letting users switch between them depending on the task.
Key features include page and article summarization where you highlight any text or open any article for an instant AI summary. It also handles YouTube video summarization, generating transcript-based summaries from a URL. The Gmail integration drafts and refines email replies within Gmail's compose window. You can upload PDFs or link to web pages and ask questions, build saved prompts for repeated tasks, and switch between GPT-4o, Claude, Gemini, and others within the same interface.
Merlin operates on a credit system. Free users receive a limited number of GPT-4 queries per day; paid plans starting around $14.99 per month for the Pro tier provide higher limits and access to more powerful models. Annual plans reduce the effective monthly cost.
The primary alternative is Sider AI, which offers similar browser-extension functionality. Merlin's advantage is its broader model selection and Gmail-specific features. Both are significantly cheaper than subscribing directly to multiple AI services.
What You'll Need
- A Merlin AI account (free to create)
- A modern web browser or the Merlin AI app
- Payment method for paid features
Getting Started
Create Your Account
Visit https://www.getmerlin.in and sign up for a freemium account. You'll need an email address to register. A free tier is available — you can upgrade later for more features.
Start Your First Conversation
Once logged in, you'll see the main chat interface. Type a question or task in the input box and press Enter. Merlin AI supports text, summarization, browser-extension, document-analysis — start with a simple text prompt to get familiar.
Natural Language Chat
Type your question or task in natural language. Merlin AI excels at understanding context and providing helpful, detailed responses.
Pro Tips
- Be specific: The more context you provide, the better the response. Instead of "write an email," try "write a professional follow-up email to a client who hasn't responded in two weeks."
- Iterate: If you don't get what you need, ask for clarification or refinement: "Make it shorter" or "Use a more formal tone."
- Use examples: Show Merlin AI what format you want by including an example in your prompt.
- Save useful conversations: Most platforms let you name and revisit conversations — organize by project or topic.
Common Use Cases
Productivity
AI tools for task management, scheduling, summarization, and workflow optimization.
Browse Productivity chatbots →General Assistant
All-purpose AI assistants for everyday questions, tasks, and conversations.
Browse General Assistant chatbots →Troubleshooting
- Responses seem generic or unhelpful
- Add more context to your prompt. Specify the audience, tone, length, and format you need. Try starting over with a clearer description of your goal.
- The tool isn't responding or is slow
- AI chatbots can experience high traffic. Refresh the page and try again. Check the service's status page if issues persist.
- Output is too long or too short
- Explicitly specify the length: "in 100 words," "as a brief summary," or "in detail with examples."
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Frequently Asked Questions
- Is Merlin AI free to use?
- Merlin AI has a free tier. Paid plans start from $14.99/mo.
- Do I need an account to use Merlin AI?
- Yes, you need to create an account to use Merlin AI.
- What can I use Merlin AI for?
- Merlin is a browser extension that brings AI assistants to any webpage. Highlight text and ask questions, summarize YouTube videos or articles, generate email replies in Gmail, and chat with GPT-4, Claude, and Gemini without leaving your browser.
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