Paste a short idea and get a detailed, structured AI prompt in seconds. Works with ChatGPT, Claude, Gemini, and MidJourney. Free prompt expander — no signup needed.
Your output will appear here
Fill in the form and click Generate to see your result
High-quality content generated from your input in seconds.
Adjust tone, length, and focus to match your needs.
One click copies everything — no reformatting needed.
Not happy? Adjust parameters and generate again.
Type or paste a short idea or concept into the input field (even a single sentence works)
Choose your target AI model and preferred output format (narrative text or JSON)
Click Generate — the AI expands your idea with context, tone, constraints, and style details
Copy the expanded prompt and paste it directly into your AI tool of choice
A prompt expander takes a short, vague idea — like 'a cosy coffee shop' — and rewrites it as a detailed, structured prompt optimised for an AI model. It adds context, tone, style, constraints, and specific details that help the AI produce much better results than a one-line instruction.
You can optimise the output for ChatGPT, Claude, Gemini, MidJourney, Grok, or Amnus. Each model has different strengths — the expander adjusts the language, structure, and specificity to match how that model best receives instructions.
Narrative text produces a flowing, descriptive prompt you paste directly into a chat interface or image generator. JSON structured output produces a machine-readable object with separate fields for role, task, context, constraints, format, tone, and examples — useful for developers building AI applications or agentic workflows.
Yes. When you select MidJourney as the target model, the expander adds visual descriptors, artistic styles, lighting, camera details, and technical parameters like aspect ratio and rendering quality — the elements that image models need to produce precise results.
Narrative prompts are 150–300 words. JSON prompts contain 7 structured fields. Both are long enough to give an AI model strong direction without being so verbose that they lose focus.
Yes — completely free, no signup required for a single trial. Create a free account for 1 daily credit. Upgrade to Pro for 200 credits/month or unlimited access on the annual plan.