Generate YouTube thumbnails via Telegram using BrowserAct and Gemini (Nano Banana Pro)

Generate YouTube thumbnails via Telegram using BrowserAct & Nano banana Pro

This workflow acts as an AI-powered "Viral Architect" for YouTube creators. Simply send a video topic (e.g., "Kling 2.6") to your Telegram bot, and it will scrape top-performing competitor thumbnails, analyze their visual strategies using AI vision, and generate a new, scientifically optimized thumbnail concept and image for you.

Target Audience YouTubers, content creators, and social media managers looking to increase their Click-Through Rate (CTR) with AI-designed thumbnails.

How it works Analyze Intent: The workflow receives a message via Telegram. An AI Agent classifies the input: is it a casual chat or a request for a thumbnail? Research Competitors: If a topic is detected, BrowserAct scrapes YouTube for the top-ranking videos on that subject. Visual Forensics: An AI Vision Agent (using OpenRouter/GPT-4o) analyzes the scraped thumbnails to understand why they work (colors, composition, text). User Approval: The bot sends a confirmation button to Telegram to ensure you want to proceed with image generation (saving credits). Creative Synthesis: Upon approval, a specialized Gemini Agent aggregates the research and crafts a high-fidelity prompt using psychological hooks and pop-culture references. Generate & Deliver: Google Gemini renders the final 4K thumbnail image, which is sent back to your Telegram chat.

How to set up Configure Credentials: Connect your Telegram, BrowserAct, Google Sheets, OpenRouter, and Google Gemini accounts in n8n. Prepare BrowserAct: Ensure the Thumbnail Maker Bot template (or a YouTube search scraper) is saved in your BrowserAct account. Setup Google Sheet: Create a Google Sheet to store analysis data. The workflow will dynamically create tabs, but you need a master sheet ID. Configure Telegram: Ensure your bot is created via BotFather and the API token is added to the Telegram credentials. Activate: Turn on the workflow.

Requirements BrowserAct* account with the Thumbnail Maker Bot* template. Telegram** account (Bot Token). Google Sheets** account. OpenRouter** account (for Vision capabilities). Google Gemini** account.

Google Sheets Requirements Spreadsheet Name:** Thumbnail Data base Sheet Name:** Database Required Columns:** Keyword Current Workflow Sheet ID

How to customize the workflow Change Art Style: Modify the system prompt in the Generate Image Prompt agent to enforce a specific aesthetic (e.g., "3D Render," "Anime," "Minimalist"). Adjust Research Depth: Change the number of videos scraped by BrowserAct to analyze more or fewer competitors. Add Text Overlay: Add an image processing node (like Cloudinary or Bannerbear) to automatically overlay the generated text onto the image for a final polish.

Need Help? How to Find Your BrowserAct API Key & Workflow ID How to Connect n8n to BrowserAct How to Use & Customize BrowserAct Templates

Workflow Guidance and Showcase Video

Automate Viral Thumbnails with n8n and AI Agents (Step-by-Step)