n8n Webhook Workflow: Generate Images with Sublyx API

Generate images from an n8n webhook using the Sublyx Images Generation API

This n8n Webhook Workflow lets you send an image prompt to a webhook endpoint and receive the generated result back as a downloadable PNG—fully automated with the Sublyx API.

What this workflow does

• Receives a POST request at the webhook URL with a required prompt field, plus optional parameters.
• Reads optional inputs: model (default: gpt-image-2) and size (default: 1024x1024).
• Calls the Sublyx AI Images Generation API to generate one image using the provided prompt and settings.
• Extracts the generated image from the Sublyx response (URL or base64 image data, depending on the API output).
• Converts base64 to a PNG binary using the workflow’s file conversion step.
• Responds to the webhook caller by returning the generated PNG as a binary download.

Use cases

• On-demand image generation in a web app: your frontend posts a prompt and instantly gets a PNG back.
• Content prototyping for SaaS operators: generate visuals for drafts, landing page iterations, or mockups.
• Automation engineers’ pipelines: integrate Sublyx-backed image creation into larger n8n workflows via webhook triggers.

Technical details

• Webhook trigger to accept POST requests containing prompt, optional model, and optional size.
• HTTP Request node to call the Sublyx Images Generation API.
• Code node for extracting image data from the Sublyx API response.
• Convert to File to turn base64 image data into a PNG.
• Respond to Webhook node to return the PNG binary to the caller.

Setup

Create a Sublyx API credential in n8n (HTTP templated custom auth) with your Sublyx API key, activate the workflow, copy the webhook URL, and send a POST payload including prompt.