AI Prompt Builder

Free tools · AI & Prompts

Build a prompt that leaves nothing to guess

Pick the model, the role and the rules. The builder assembles a structured prompt you can paste anywhere, and it does it here, in your browser: no model, no account, nothing uploaded.

  • Nothing is uploaded
  • Works offline
  • Structure per model

Prompt builder

Local
01

Where will you paste it?

The structure changes; your words do not.

02

The task

One sentence is enough if it says what “done” looks like.

03

Shape of the answer

04

Rules it must respect

These are the lines a model forgets when nobody writes them down.

05

Example of a good answer (optional)

One sample teaches more than three paragraphs of instructions.

06

Start from a preset

Fills the fields; you can change everything afterwards.

Your prompt

0 chars 0 words ~0 tokens 

      
      

        
        
        
        
      

    

  


  

  

    
What the builder is actually doing

    
A good prompt is not longer: it is ordered. These five blocks are the order that survives pasted instructions, long chats and model changes.

    

      

        1. RoleWho answers, and with what experience. One line beats ten adjectives.
      

      

        2. TaskA verb and a finish line: what “done” looks like.
      

      

        3. ContextThe facts the model cannot guess: audience, budget, constraints.
      

      

        4. RulesWhat it must not do. The part everyone forgets.
      

    

    
The fifth block is the shape of the answer: format and length. Same prompt, different model: the structure changes (tags for Claude, headings for ChatGPT and Gemini, short lines for a local model), but the content stays yours.

  


  

    
Related tools

    
Measure it, adapt it, or draw with it.

    

      
        
        Token CounterExact tokens and cost before you paste
      
      
        
        Image Prompt GeneratorPrompts for Midjourney, Flux and SDXL
      
      
        
        All free toolsThe rest of the lab
      
    

  


  

    
Frequently asked questions

    

      
Does this use AI?

      
No. It assembles a structured prompt from your choices inside your browser. No model runs here, nothing is sent anywhere and no key is needed; the AI is whatever you paste the prompt into.

      
Which model should I pick?

      
The one you are going to paste it into. ChatGPT and Gemini read headed sections well, Claude reads XML tags well, and a local model does better with short, direct lines. Picking a different model only changes the structure, never your words.

      
Can I reuse the same prompt with placeholders?

      
Yes. Write anything like {{topic}} in a field and the builder keeps it as written, so the same prompt can be filled in later or shared with a colleague.

      
Where can I see the exact token count?

      
The counter at the top is a rough estimate (characters divided by four). For the exact number per model, paste the result into the Token Counter, which runs the real tokenizer on your device.