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Free Claude Prompt Optimizer
Rewrite your prompts using Anthropic Claude best practices — XML tags, clear structure and detailed context — for better results.
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Your prompt
Fill in the fields and click Generate Prompt. Your ready-to-paste prompt appears here.
How to use the Claude Prompt Optimizer
- Paste the prompt you use with Claude.
- Choose what to optimize for and whether to use XML tags.
- Click Generate Prompt and run the instruction in Claude.
- Use the optimized, well-structured prompt for higher-quality output.
Prompt Claude the way it likes
Claude is particularly good at following structured prompts. Anthropic recommends using XML tags to separate instructions, context and examples, providing rich detail, and letting Claude reason step by step for complex tasks. This optimizer rewrites your prompt around those practices so Claude has a clear, unambiguous brief.
It shines for long-form writing, document analysis and careful reasoning. Working with other models? Try the ChatGPT or Gemini prompt optimizers instead.
Frequently asked questions
Why use XML tags with Claude?
Claude reliably respects XML structure, so tags like and reduce ambiguity and improve adherence. The optimizer can add them automatically.
Which Claude models does it work with?
Any Claude model. More capable versions handle complex, structured prompts especially well.
Does it preserve my intent?
Yes. It restructures the prompt for clarity without changing what you are asking for.
Is it free?
Yes, free with no account.