Generate ad images from campaign briefs with GPT-4o and OpenAI Image API

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2/3/2026

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Description:

Supercharge your marketing with this next-gen n8n workflow template, powered by GPT-4o! Instantly convert your campaign briefs into stunning, high-impact advertising images—no manual design work required.

This automation captures your brand’s unique voice, visual style, and campaign goals, then uses GPT-4o-mini to craft ultra-specific prompts for OpenAI’s image generation API. Within seconds, you’ll receive vibrant, ready-to-use ad visuals, perfectly tailored for your audience and objectives.

The workflow delivers:

🚀 Lightning-fast AI-generated ad images from your campaign insights

🎯 Brand-aligned, visually striking creatives—every time

📝 Automated prompt creation based on your tone, palette, and scene ideas

📐 High-resolution, square-format images (1024x1024) for maximum versatility

🔗 Downloadable files for instant campaign deployment

🌟 100% hands-free: just input your brief and let AI handle the rest

Perfect for marketing teams, agencies, and entrepreneurs who want to scale creative production, boost consistency, and stand out with AI-powered ad visuals.

Keywords: n8n GPT-4o image automation, AI ad creative generator, campaign brief to image, OpenAI marketing visuals, instant ad image workflow, automated creative production.

n8n Workflow: Generate Ad Images from Campaign Briefs with AI

This n8n workflow leverages the power of AI to generate multiple ad image concepts from a single campaign brief. It streamlines the creative process by taking a brief, using an AI agent to brainstorm image ideas, and then preparing these ideas for image generation.

What it does

This workflow automates the following steps:

Manual Trigger: The workflow is initiated manually, allowing you to control when to generate ad images.
Edit Fields (Set): This node is used to define the input for the AI agent, likely setting the campaign brief or a similar prompt.
AI Agent: An AI agent (powered by LangChain) processes the campaign brief to generate multiple creative ad image concepts. It acts as a brainstorming tool, producing diverse ideas based on the input.
Split Out: The output from the AI agent, which is expected to be a list or array of image concepts, is split into individual items. This ensures each concept can be processed independently.
Convert to File: Each individual ad image concept is converted into a file format, likely preparing it for a subsequent image generation API call (though the image generation node itself is not present in this JSON, this conversion step suggests it's an intended next step).
HTTP Request: This node is a placeholder or a generic step, which would typically be configured to call an external image generation API (e.g., OpenAI Image API, DALL-E, Midjourney, etc.) using the prepared image concepts.

Prerequisites/Requirements

To use this workflow, you will need:

n8n Instance: A running instance of n8n.
AI Model Credentials: Access to an AI language model (specifically an Azure OpenAI Chat Model as indicated by the lmChatAzureOpenAi node) and its corresponding credentials (API key, endpoint, etc.). This model is used by the AI Agent.
OpenAI Image API (or similar): While not explicitly configured in the provided JSON, the workflow's purpose implies the need for an image generation API (e.g., OpenAI's DALL-E, Stable Diffusion, etc.) that would be called by the HTTP Request node. You would need an API key and access to such a service.

Setup/Usage

Import the workflow: Download the provided JSON and import it into your n8n instance.
Configure Credentials:
- Azure OpenAI Chat Model: Configure the Azure OpenAI Chat Model node with your Azure OpenAI API key and deployment details.
- HTTP Request: If you intend to connect this to an image generation API, you will need to configure the HTTP Request node with the API endpoint, authentication (e.g., API key in headers), and the request body to send the image concept.
Define the Campaign Brief: In the Edit Fields (Set) node, provide your campaign brief or the initial prompt that the AI Agent should use to generate ad image ideas.
Execute the workflow: Click "Execute workflow" on the Manual Trigger node to run the workflow.

The workflow will then process your brief, generate image concepts, and prepare them. You would then extend the HTTP Request node to send these concepts to your chosen image generation service.

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