Skip to content
Better AI Prompts

Claude Prompt Optimizer

Claude is unusually good at long, carefully separated context — and XML-style tags are how you separate it. This optimizer rewrites your prompt into tagged sections like <context> and <instructions>, and scores the result for Claude.

  • Free to use
  • Free account required
  • Your prompt stays yours
Characters used: 0/2000
Try one:

Ask a few questions when key details are missing.

Your optimized prompt will appear here

Write a rough prompt, pick the AI you'll use it with, and optimize.

How it works

  • 1

    Tagged sections

    Role, context, instructions, constraints and output format become explicit tags. Claude keeps them apart, which matters most when the context is long.

  • 2

    Room for your material

    The structure leaves an obvious place to paste documents, transcripts or code — inside the context tag, where it will not be mistaken for an instruction.

  • 3

    Scored for Claude

    Model fit rewards tagged structure here. Paste the same prompt into the ChatGPT page and you will get Markdown headings instead.

When to use it

  • Working with long documents

    Contracts, transcripts, research papers. Tags keep "here is the material" separate from "here is what to do with it".

  • Analysis you want to trust

    Explicit constraints — cite the section, say when it is not stated — reduce confident guessing.

  • Writing in a specific voice

    A voice section with two examples does far more than the word "professional".

Frequently asked questions

  • Why does Claude prefer XML tags?

    Tags make boundaries unambiguous, which matters when a prompt carries a lot of pasted material. Anthropic's own guidance recommends them, and in practice Claude follows tagged instructions more consistently.

  • Can I use the result in Claude Code?

    Choose Claude Code as the target instead. It produces an agentic structure — goal, context, requirements, approach, verification — rather than a writing framework.

  • Does it work with Claude's free tier?

    Yes. The optimizer produces text; where you paste it is up to you.

  • Will it shorten my prompt?

    It can. Quick mode tightens a prompt that is already good rather than padding it, and Auto picks Quick when your prompt already scores 70 or more.

Related free tools