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Generate AI product ad images from Google Sheets using Fal.ai and OpenAI

Jaruphat J.Jaruphat J.
399 views
2/3/2026
n8n
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⚠️ Note: All sensitive credentials should be set via n8n Credentials or environment variables. Do not hardcode API keys in nodes.

Who’s it for

Marketers, creators, and automation builders who want to generate UGC-style ad images automatically from a Google Sheet. Ideal for e‑commerce SKUs, agencies, or teams that need many variations quickly.

What it does (Overview)

This template turns a spreadsheet row into ad images ready for campaigns.

  • Zone 1 — Create Ad Image: Reads product rows, downloads image, analyzes it, generates prompts, appends results back into Google Sheet.
  • Zone 2 — Create Image (Fal nano‑banana): Generates ad image variations, polls Fal.ai API until done, uploads to Drive, and updates sheet with output URLs.

Requirements

  • Fal.ai API key (env: FAL_KEY)
  • Google Sheets / Google Drive OAuth2 credentials
  • OpenAI (Vision/Chat) for image analysis
  • A Google Sheet with columns for product and output
  • Google Drive files set to Anyone with link → Viewer so APIs can fetch them

How to set up

  1. Credentials: Add Google Sheets + Google Drive (OAuth2), Fal.ai (Header Auth with Authorization: Key {{$env.FAL_KEY}}), and OpenAI.
  2. Google Sheet: Create sheets with the following headers.

Sheet: product

product_id | product_name | product_image_url | product_description | campaign | brand_notes | constraints | num_variations | aspect_ratio | model_target | status

Sheet: ad_image

scene_ref | product_name | prompt | status | output_url
  1. Import the workflow: Use the provided JSON. Confirm node credentials resolve.
  2. Run: Start with Zone 0 to verify prompt-only flow, then test Zone 1 for image generation.

Zone 1 — Create Ad Image (Prompt-only)

Reads product row, normalizes Drive link, analyzes image, generates structured ad prompts, appends to ad_image sheet.

Zone 2 — Create Image (Fal nano‑banana)

Reads product row, converts Drive link, generates image(s) with Fal nano‑banana, polls until complete, uploads to Drive, updates sheet.

Node settings (high‑level)

Drive Link Parser (Set)

{{ (() => {
  const u = $json.product || '';
  const q = u.match(/[?&]id=([\-\w]{25,})/);
  const d = u.match(/\/d\/([\-\w]{25,})/);
  const any = u.match(/[\-\w]{25,}/);
  const id = q?.[1] || d?.[1] || (any ? any[0] : '');
  return id ? 'https://drive.google.com/uc?export=view&id=' + id : '';
})() }}

How to customize the workflow

  • Adjust AI prompts to change ad style (luxury, cozy, techy).
  • Change aspect ratio for TikTok/IG/Shorts (9:16, 1:1, 16:9).
  • Extend Sheet schema for campaign labels, audiences, hashtags.
  • Add distribution (Slack/LINE/Telegram) after Drive upload.

Troubleshooting

  • JSON parameter needs to be valid JSON → Ensure expressions return objects, not strings.
  • 403 on images → Make Drive files public (Viewer) and convert links.
  • Job never completes → Check status_url, retry with *-fast models or off‑peak times.

Template metadata

  • Uses: Google Sheets, Google Drive, HTTP Request, Wait/If/Switch, Code, OpenAI Vision/Chat, Fal.ai models (nano‑banana)

Visuals

Workflow Diagram

Workflow Diagram

Example Product Image

Alt text

Product Image - nano Banana

Alt text Alt text Alt text Alt text

Generate AI Product Ad Images from Google Sheets using Fal.ai and OpenAI

This n8n workflow automates the creation of product advertisement images by leveraging data from Google Sheets and AI image generation services. It intelligently processes product information, generates descriptive prompts, creates images, and saves them to Google Drive, streamlining your marketing content creation.

What it does

This workflow performs the following steps:

  1. Triggers Manually: The workflow is initiated manually, allowing you to control when ad images are generated.
  2. Reads Product Data from Google Sheets: It fetches product details (e.g., product name, description, features) from a specified Google Sheet.
  3. Filters for Unprocessed Items: It checks if a product already has an image URL. Only products without an existing image URL proceed.
  4. Generates AI Prompts:
    • It uses an OpenAI Chat Model to generate a detailed image generation prompt based on the product's name and description.
    • A Structured Output Parser ensures the prompt is formatted correctly for the image generation service.
  5. Generates AI Images (via Fal.ai HTTP Request):
    • It sends the generated prompt to the Fal.ai API (using an HTTP Request node) to create the ad image.
    • A Wait node is included to handle potential rate limits or processing delays from the image generation service.
  6. Uploads Images to Google Drive: The generated image is then uploaded to a specified folder in Google Drive.
  7. Updates Google Sheet with Image URL: Finally, it updates the original Google Sheet with the URL of the newly generated image, marking the product as processed.

Prerequisites/Requirements

To use this workflow, you will need:

  • n8n Instance: A running n8n instance.
  • Google Sheets Credential: An n8n credential configured for Google Sheets access (OAuth 2.0 recommended).
  • Google Drive Credential: An n8n credential configured for Google Drive access (OAuth 2.0 recommended).
  • OpenAI API Key: An API key for OpenAI to use the Chat Model.
  • Fal.ai API Key: An API key for Fal.ai to generate images.
  • Google Sheet: A Google Sheet containing your product data with columns for "Product Name", "Product Description", and a column to store the "Image URL".

Setup/Usage

  1. Import the Workflow: Download the provided JSON and import it into your n8n instance.
  2. Configure Credentials:
    • Set up your Google Sheets credential.
    • Set up your Google Drive credential.
    • Set up your OpenAI credential.
    • Set up your Fal.ai API key within the "HTTP Request" node (likely in the headers or body for authentication).
  3. Configure Google Sheets Node (ID: 18):
    • Specify the Spreadsheet ID and Sheet Name where your product data is located.
    • Ensure the "Read All" operation is configured to fetch all necessary product details.
  4. Configure "If" Node (ID: 20):
    • Adjust the condition to check the column that indicates whether an image has already been generated (e.g., {{ $json["Image URL"] === "" }} if your column is named "Image URL").
  5. Configure "OpenAI Chat Model" Node (ID: 1153):
    • Ensure your OpenAI credential is selected.
    • Review and adjust the prompt template to accurately describe how product information should be used to generate image descriptions.
  6. Configure "HTTP Request" Node (ID: 19):
    • This node is responsible for calling the Fal.ai API.
    • Set the URL to the appropriate Fal.ai image generation endpoint.
    • Configure the Method (likely POST).
    • Add your Fal.ai API Key to the HTTP Headers (e.g., Authorization: Bearer YOUR_FAL_AI_API_KEY).
    • Adjust the Body to send the generated prompt from the previous node in the format Fal.ai expects.
  7. Configure "Google Drive" Node (ID: 58):
    • Select your Google Drive credential.
    • Specify the Folder ID where you want to save the generated images.
    • Ensure the "Upload File" operation is configured to use the image data returned by the Fal.ai HTTP Request node.
  8. Configure "Google Sheets" Node (ID: 18, second instance):
    • Specify the same Spreadsheet ID and Sheet Name.
    • Configure the "Update Row" operation to update the "Image URL" column with the URL of the file uploaded to Google Drive. Use an expression like {{ $node["Google Drive"].json["url"] }} to get the URL.
    • Ensure you correctly identify the row to update (e.g., using the "Product Name" or a unique ID from the initial Google Sheets read).
  9. Activate the Workflow: Once configured, activate the workflow.
  10. Execute Manually: Click "Execute Workflow" on the "Manual Trigger" node to run the workflow and start generating ad images.

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