Generate images in n8n with GPT Image 2 (free webhook template)

If you build in n8n, you probably want image generation as a clean building block: something you can call from anywhere, that returns an image and nothing else. That is exactly what this template is. Three nodes, one webhook, one key.

Grab the free template, and here is how to set it up and use it.

1. Import the template

Open the template page and download the JSON. In n8n, create a new workflow and use Import from File (or paste the JSON). The three nodes and their wiring come in ready.

2. Add your ApexApi credential

Open the Generate image node and pick your ApexApi credential (or create one with your ak- key from apexapi.dev/keys). The model is already set to openai/gpt-image-2. That is the only setup step.

3. How it works: three nodes

The whole workflow is a straight line:

• Webhook: POST a prompt receives a request. It is set to responseMode: responseNode, so the workflow answers on the same call.
• Generate image (GPT Image 2) takes the prompt from the request body ({{ $json.body.prompt }}) and calls GPT Image 2 through ApexApi.
• Respond with the image sends the result back to the caller.

That is it. A prompt goes in, an image comes back. No queues, no polling, no second service.

4. Call it

Activate the workflow, then POST a prompt to the webhook URL. During editing use the test URL; once active, use the production URL n8n gives you.

curl -X POST https://YOUR-N8N-HOST/webhook/generate-image \
  -H "Content-Type: application/json" \
  -d '{"prompt": "a red bicycle leaning on a blue wall, soft morning light"}'

The response contains the generated image. Point your app, your bot, or another tool at that URL and you have image generation on tap.

5. Use it as a sub-workflow

Because it is a webhook, it is reusable by design. Inside a bigger automation, call it as a step (an Execute Workflow node, or just an HTTP request to its URL) whenever you need an image, and keep the generation logic in one place. Change the model or defaults once, and every caller gets the update.

6. Swap the model, and prompt it well

Want a different look? Change the model field on the Generate image node to any image model in the catalog. And since the prompt does most of the work, the GPT Image 2 prompting guide has five techniques (including the text-rendering trick) that make the output noticeably better.

Where to go next

• Get the template: download and import.
• GPT Image 2 API: live pricing and specs.
• Build AI workflows in n8n: install the node and the other templates.
• ApexApi MCP: the same, from Claude Code instead of n8n.

Three nodes, and every workflow you own can make images.