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Free AI image generator - n8n automation workflow with Gemini/ChatGPT

Agent CircleAgent Circle
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2/3/2026
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This n8n template demonstrates how to use AI to generate custom images from scratch - fully automated, prompt-driven, and ready to deploy at scale.

Use cases are many: You can use it for marketing visuals, character art, digital posters, storyboards, or even daily image generation for your personal purposes.

How It Works

  • The flow is triggered by a chat message in N8N or via Telegram. The default image size is 1080 x 1920 pixels. To use a different size, update the values in the “Fields - Set Values” node before triggering the workflow.
  • The input is parsed into a clean, structured prompt using a multi-step transformation process.
  • Our AI Agent sends the final prompt to Google Gemini’s image model for generation (you can also integrate with OpenAI or other chat models).
  • The raw image data created by the AI Agent will be run through a number of codes to make sure it's feasible for your preview if needed and downloading.
  • Then, we use an HTTP node to fetch the result so you can preview the image.
  • You can send it back to the chat message in N8N or Telegram, or save it locally to your disk.

How To Use

  • Download the workflow package.
  • Import the package into your N8N interface.
  • Set up the credentials in the following nodes for tool access and usability: "Telegram Trigger"; "AI Agent - Create Image From Prompt"; "Telegram Response" or "Save Image To Disk" (based on your wish).
  • Activate the "Telegram Response" OR "Save Image To Disk" node to specify where you want to save your image later.
  • Open the chat interface (via N8N or Telegram).
  • Type your image prompt or detailed descriptions and send.
  • Wait for the process to run and finish in a few seconds.
  • Check the result in your desired saving location.

Requirements

  • Google Gemini account with image generation access.
  • Telegram bot access and chat setup (optional).
  • Connection to local storage (optional).

How To Customize

  • We’re setting the default image size to 1080 x 1920 pixels and the default image model to "flux". You can customize both of these values in the “Fields – Set Values” node. Supported image model options include: "flux", "kontext", "turbo", and "gptimage".
  • In the “AI Agent – Create Image From Prompt” node, you can also change the AI chat model. By default, it uses Google Gemini, but you can easily replace it with OpenAI ChatGPT, Microsoft AI Copilot, or any other compatible provider.

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Free AI Image Generator - n8n Automation Workflow with Gemini/ChatGPT

This n8n workflow provides a simple yet powerful way to generate AI images on demand using a chat interface, specifically Telegram. It acts as a backend for an AI image generation bot, allowing users to request images and receive them directly in their chat.

What it does

This workflow automates the following steps:

  1. Listens for chat messages: It triggers when a new message is received in a configured Telegram chat.
  2. Processes the message: It extracts the user's message, which is expected to be a prompt for image generation.
  3. Generates an image prompt (AI Agent): It uses an AI Agent (likely powered by a large language model like Gemini or ChatGPT) to refine or create an optimal image generation prompt based on the user's input.
  4. Generates the image (HTTP Request): It sends the refined prompt to an external AI image generation API via an HTTP Request.
  5. Saves the image locally: It saves the generated image (binary data) to a local disk.
  6. Sends the image back to the user: It sends the generated image as a photo back to the user in the Telegram chat.

Prerequisites/Requirements

To use this workflow, you will need:

  • n8n Instance: A running n8n instance.
  • Telegram Bot Token: A Telegram bot token and a chat ID where the bot will listen for messages and send images.
  • AI Image Generation API: Access to an AI image generation API (e.g., DALL-E, Stable Diffusion, Midjourney, etc.) that can be called via an HTTP request. You will need its API endpoint and any necessary authentication (API key).
  • Google Gemini Chat Model Credential: A Google Gemini credential configured in n8n for the AI Agent.
  • Local Storage Access: The n8n instance needs write access to a local directory to save the generated images temporarily.

Setup/Usage

  1. Import the Workflow: Import the provided JSON into your n8n instance.
  2. Configure Telegram Trigger:
    • Select your Telegram credential.
    • Ensure it's configured to listen for new messages.
  3. Configure AI Agent (Google Gemini Chat Model):
    • Select your Google Gemini Chat Model credential.
    • Review the agent's configuration to ensure it's set up to generate image prompts.
  4. Configure HTTP Request:
    • Update the HTTP Request node with the URL of your chosen AI image generation API.
    • Add any required headers (e.g., Authorization with your API key) and body parameters for sending the image prompt. The prompt will likely come from the output of the "AI Agent" node.
  5. Configure Read/Write Files from Disk:
    • Specify the directory where the generated images should be saved.
    • Ensure the filename is dynamic (e.g., using a timestamp or a unique ID) to avoid overwriting.
  6. Configure Telegram (Send Image):
    • Select your Telegram credential.
    • Set the Chat ID to the chat_id from the initial Telegram Trigger node.
    • Configure it to send a photo, referencing the binary data output from the "Read/Write Files from Disk" node.
  7. Activate the Workflow: Once all credentials and configurations are set, activate the workflow.

Now, when you send a message to your Telegram bot, it will process your request, generate an image, and send it back to you!

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