How I Built a Prompt Generator to Create 10K+ AI Image Prompts for My ML Dataset

The Problem

I was training a custom ML model and needed a large, diverse image dataset. My options:

1. 
   Scrape the internet - Copyright issues, inconsistent quality, messy metadata


2. 
   Use GPT - Repetitive outputs, no structure, expensive at scale


3. 
   Generate my own images - But I needed thousands of unique, categorized prompts

Manually writing prompts? Not an option.

The Solution: PromptAnvil

I built PromptAnvil - a prompt configuration tool that generates hundreds of unique, structured prompts in seconds.

Core Concept

Instead of writing prompts one by one, you define:

• 
  Categories (subject, style, lighting, mood, etc.)


• 
  Entries with optional weights


• 
  Templates using {tokens}
  


• 
  Logic rules for context control

Then hit generate → get unique combinations.

Quick Example

Categories:

- subject: cat, dog, owl

- style: watercolor, oil painting, pixel art

- mood: peaceful, dramatic



Template: "{subject} in {style} style, {mood} atmosphere"



Output:

→ "cat in watercolor style, peaceful atmosphere"

→ "owl in pixel art style, dramatic atmosphere"

→ ... 18 unique combinations

Scale up to thousands by adding more entries.

Key Features

1. Weighted Randomization

subject:

  - warrior (weight: 3)

  - mage (weight: 1)

  - archer (weight: 1)

Warrior appears 60% of the time.

2. Conditional Logic

IF subject = "archer" THEN setting = "forest"

IF setting = "ruins" THEN EXCLUDE mood = "peaceful"

No more archers in castles or peaceful ruins.

3. Tag Linking

Group related entries across categories:

Tag "cyber":

- setting: neon-lit megacity

- clothing: tech jacket

- lighting: pink neon glow

When one is selected, others follow. Context stays coherent.

4. Export Options

• 
  JSON - For programmatic pipelines


• 
  TXT - One prompt per line


• 
  CSV - With category metadata

Perfect for batch processing with ComfyUI, Automatic1111, or custom scripts.

5. AI-Powered Helpers

• 
  Config Generator - Describe what you want, AI builds the entire configuration


• 
  Entry Generator - AI suggests entries for your categories


• 
  Logic Rule Generator - AI creates smart conditional rules


• 
  Prompt Refiner - 3-agent pipeline (Critic → Refiner → Evaluator) improves your prompts

Still in active development, but already saves time of manual setup.

Tech Stack

• Next.js 15 (React 19)


• TypeScript


• Zustand for state management


• Supabase for auth & cloud sync


• Java + Spring Boot backend


• Redis for rate limiting & caching

Try It

🔗 promptanvil.com

Free to use. No signup required for basic features.

Built this to solve my own problem - now sharing with the community. Feedback welcome!