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Clean & Sanitize
Removes invisible characters, collapses repeated spaces, normalizes line breaks, strips escape backslashes and unwraps leftover markdown like bold markers and heading hashes.
Free · No sign-up · Runs in your browser
Clean, format & optimize your AI prompts instantly
Paste a messy prompt, pick a transformation, and copy a clean, structured result. Nothing you type ever leaves your device.
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Choose a transformation
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Ready. Paste a prompt and choose a transformation above.
How the Prompt Cleaner works
Four fast, deterministic transformations – no AI calls, no waiting, no data leaving your browser.
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Optimize for ChatGPT
Sorts your sentences into a clear template with Context, Task, Constraints and Output Format sections – the structure large language models follow most reliably.
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Fix Formatting
Capitalizes sentences, fixes the pronoun "I", converts mixed bullet symbols to a single style, renumbers lists and tidies punctuation spacing.
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Strip Variables
Finds free-text placeholders such as [insert name here] and standardizes them to {{NAME}}, ready for templates and automations.
Why clean your AI prompts?
Prompts copied from emails, PDFs, spreadsheets or other chat windows often carry hidden baggage: non-breaking spaces, zero-width characters, smart quotes, doubled line breaks and half-rendered markdown. These artifacts waste tokens, confuse formatting and can subtly change how a model interprets your instructions.
A well-structured prompt – one that separates background, the actual request, hard rules and the expected output shape – consistently produces better, more predictable answers. This tool gives you that structure in a single click, so you can spend your time on the idea instead of the formatting.
Frequently asked questions
Is my prompt sent to a server?
No. All processing happens locally in your browser with plain JavaScript. Your text is never uploaded, stored or logged.
Does this use AI to rewrite my prompt?
No. The tool uses rule-based text transformations. It reorganizes and tidies your own words rather than inventing new content, so the meaning of your prompt stays yours. Always give the result a quick read before using it.
Will the optimized prompt work with Claude, Gemini or other models?
Yes. The Context / Task / Constraints / Output Format layout is model-agnostic and works well with most modern chat-based language models.
What happens to code blocks in my prompt?
Text inside triple-backtick code fences is protected from whitespace, capitalization and placeholder changes by the cleaning, formatting and variable actions, so your code stays exactly as written.
Is the tool really free?
Yes. It is free to use with no account and no usage limits. The site is supported by advertising.