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Prompt Improver

Paste a prompt and this scores it out of 100 against thirteen things that change what a model gives back — role, context, format, length, audience, constraints, examples. It shows you which are missing, why each one matters, and rewrites your prompt with the gaps filled in as placeholders.

Paste the prompt exactly as you send it. The more honest the input, the more useful the score.

0 words
— / 100

    Improved prompt

    
    
    
  
    

  
    Nothing leaves your browser. No account, no server, no logging. Close the tab and it is gone.
    

    




    How it works
    

      

    • It checks your prompt against thirteen weighted rules drawn from what actually changes output quality, not from prompt-engineering folklore.
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    • Each failed check comes with the specific fix, not a generic ‘be more specific’.
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    • The rewrite keeps your words as the task and wraps the structure around them, with [PLACEHOLDERS] where only you know the answer.
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    • Pick Structured, Compact or XML-tagged depending on where the prompt is going.
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    What it does not do
    

    Every tool on this site says this plainly, because a tool that pretends to do more than it does costs you more than it saves.
    

      

    • It cannot tell whether your prompt will work — only whether it is well formed. A well-formed prompt for the wrong task still fails.
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    • It reads patterns, not meaning. A prompt that says ‘format: good’ passes the format check.
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    • The score is a diagnostic, not a target. A 100 is not the goal; sending fewer bad prompts is.
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    Nothing you type here leaves your browser
    

    There is no account, no server and no logging. The whole tool is JavaScript running on your own machine — close the tab and it is gone. You can check: open your browser’s network tab and use it.
    

    

    Questions people ask
    

    

    What makes a prompt score badly?
    Almost always the same three: no output format, no length bound, and vague quality words like ‘engaging’ or ‘professional’ that mean nothing to a model. Those three account for most low scores.
    

    

    Should I always aim for 100?
    No. Short prompts for simple tasks are fine and will score badly here. Use it when a prompt is not giving you what you want — the checklist tells you what to try next.
    

    

    Does it send my prompt anywhere?
    No. Everything runs in your browser. There is no server, no account and no logging.
    

    

    


      

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      Fundamentals
      

      The handful of things that account for most of the difference.
      

          7 prompts
  
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      Troubleshooting
      

      Diagnosing the specific ways prompts fail, and what to change.
      

          7 prompts
  
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    Free, no sign-up. Last updated 18 September 2026.