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4.9 – Create a Custom Image Prompt Generator GPT Lesson

Learn how to design, test, and refine your own custom GPT that automatically generates creative image prompts for tools like DALL·E 3. This lesson sets you up with skills for building a reusable prompt generator, streamlining your workflow for art and content production. For a full demonstration, see the accompanying video, where you’ll observe each step in action.

What you'll learn

  • Enable Beta Features to unlock access to custom GPT building tools

  • Navigate ChatGPT’s Explore menu to find, create, and manage custom GPTs

  • Define and configure your GPT’s goals, name, and appearance for image prompt generation

  • Upload instructional files to guide your GPT’s prompt creation logic

  • Adjust builder settings and capabilities, such as web content access

  • Test, tweak, and share your finished prompt generator for ongoing use

Lesson Overview

Creating imaginative image prompts efficiently is a key part of producing art with AI tools like DALL·E 3. Typing out detailed prompts each time can be repetitive and time-consuming. This lesson introduces the technique of building your own custom GPT—a personalized version of ChatGPT trained to generate prompt ideas automatically and in your preferred style.

Custom GPTs are designed for flexibility. They can combine built-in instructions, extra files, and specific skills to build a tool you can quickly access and share. Whether you’re regularly generating prompts for digital art projects, helping students learn visual storytelling, or managing a design workflow, a custom image prompt generator streamlines your creative process. This lesson also guides you in managing your prompt generator, testing its outputs, and sharing it securely with others if you wish.

By the end of the lesson, you’ll have a configurable tool that lives in your ChatGPT sidebar, saving you time and giving you control over the style and format of your prompts. This method is practical for anyone looking to automate and standardize image prompt creation, giving you more space for creativity and less room for repetitive tasks.

Who This Is For

Building your own prompt generator supports anyone working regularly with AI-generated images or creative projects. You’ll especially benefit if you are:

  • Artists and designers seeking fast, varied prompt ideas
  • Educators introducing students to AI art
  • Content creators or marketers generating tailored visuals
  • Product managers or developers building creative workflows
  • Anyone looking to save time on repeat prompt tasks
  • Enthusiasts exploring the capabilities of custom GPTs
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Where This Fits in a Workflow

A custom image prompt generator becomes a central part of your AI art creation process. After setting up your generator, you’ll use it whenever you want fresh, detailed prompts—eliminating the need to craft each one from scratch. For instance, a teacher might use the tool to create weekly art assignments, while a social media manager could quickly assemble themes for seasonal visual posts. This lesson is most useful at the idea or pre-production stage, just before you feed prompts into an image creation tool or platform. It’s also a foundation for future automation, as you can adjust, reuse, or expand your generator over time.

Technical & Workflow Benefits

Traditionally, prompt creation is a manual process: you think of an idea, compose a description, revise wording, and repeat for each use case. Building a custom GPT replaces these repetitive steps with an automated solution. You’ll notice several improvements:

  • Faster output—generate several prompt variations in seconds
  • Consistency—maintain a specific tone, format, or artistic style across all prompts
  • Customization—easily update the generator with new instructions or files as your needs change
  • Collaboration—share your GPT with team members, ensuring everyone can access uniform, high-quality prompts
  • Real-world example: a team launching a product campaign can generate multiple themed prompts at once, ensuring a consistent visual direction and freeing up creative energy for refinement and review.

Practice Exercise

Apply your new skills by building a prompt generator you can use immediately. Here’s a simple exercise:

  1. Prepare a document with 3–5 prompt instructions (e.g., “Focus on watercolor styles,” “Include specific color themes,” “Vary the mood: calm, energetic, mysterious”).
  2. Build your custom GPT using the steps outlined—upload your file, name your GPT, and configure its features.
  3. Test your GPT by asking for two prompts for a theme of your choice, then review how closely the output matches your instructions.

Reflection question:

How did the prompts generated by your new GPT compare to ones you’d write manually, in terms of style and detail?

Course Context Recap

This lesson is part of a hands-on series teaching you how to integrate generative AI tools into creative workflows. Now that you’ve built an image prompt generator GPT, you’re ready for the next step: using those prompts to make actual images, which you’ll explore in the following lesson. Earlier, you covered how to organize instructions and set up prompt content. Continue to the next part of the course to put your prompt generator to work in real-world creative projects and further refine your AI-driven approach. Explore the rest of the course to build deeper skills and unlock even more capabilities with generative AI.