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Generate Marketing Ad Banners with LINE, Gemini, and Nano Banana Pro

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Created by: Masaki Go || pippi

Masaki Go

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Last update 12 hours ago

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About This Template

This workflow creates high-quality, text-rich advertising banners from simple LINE messages.

It combines Google Gemini (for marketing-focused prompt engineering) and Nano Banana Pro (accessed via Kie.ai API) to generate images with superior text rendering capabilities. It also handles the asynchronous API polling required for high-quality image generation.

How It Works

  1. Input: Users send a banner concept via LINE (e.g., "Coffee brand, morning vibe").
  2. Prompt Engineering: Gemini optimizes the request into a detailed prompt, specifying lighting, composition, and Japanese catch-copy placement.
  3. Async Generation: The workflow submits a job to Nano Banana Pro (Kie API) and intelligently waits/polls until the image is ready.
  4. Hosting: The final image is downloaded and uploaded to a public AWS S3 bucket.
  5. Delivery: The image is pushed back to the user on LINE.

Who It’s For

  • Marketing teams creating A/B test assets.
  • Japanese market advertisers needing accurate text rendering.
  • Developers looking for an example of Async API Polling patterns in n8n.

Requirements

  • n8n (Cloud or Self-hosted).
  • Kie.ai API Key (for Nano Banana Pro model).
  • Google Gemini API Key.
  • AWS S3 Bucket (Public access enabled).
  • LINE Official Account (Messaging API).

Setup Steps

  1. Credentials: Configure the "Header Auth" credential for the Kie.ai nodes (Header: Authorization, Value: Bearer YOUR_API_KEY).
  2. AWS: Ensure your S3 bucket allows public read access so LINE can display the image.
  3. Webhook: Add the production webhook URL to your LINE Developers console.