PFPromptFoo

Prompt

Prompt Optimizer

Rewrite an existing prompt to be clearer, tighter, and more likely to get the output you want.

The improved prompt will appear here.

What it does

Prompt Optimizer helps you rewrite an existing prompt to be clearer, tighter, and more likely to get the output you want — without switching context, copy-pasting between apps, or writing boilerplate.

Why use it

  • Faster than prompting cold. Structured inputs mean the model has what it needs on the first try.
  • Model-agnostic output. Works with ChatGPT, Claude, Gemini and any other model you use.
  • Free. No sign-in required to try. Save your work with a free account.

How to use it

  1. 01

    Describe what you want the model to do in plain language.

  2. 02

    Add audience, tone, or format if you have preferences.

  3. 03

    Copy the result into ChatGPT, Claude, Gemini — or save it to your library.

Best practices

  • Be specific about the outcome you want, not just the topic.
  • Give one clear example if the output should follow a pattern.
  • Constrain length, tone, and format up front to avoid rework.

FAQs

Is Prompt Optimizer free?
Yes. The core tool is free to use without an account.
Which models does it work with?
The output is portable across every major AI model — ChatGPT, Claude, Gemini, Grok, DeepSeek, and open-weight models.
Can I save my results?
Create a free account to save prompts, build collections, and share.