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Create your AI that knows when to say "I don't know." Try it on your data →
Paste a ChatGPT prompt. Get a clearer, more specific version back — free, no signup needed.
Want to do more than improve prompts? Build an AI agent trained on your data.
Drop in any prompt you'd normally send to ChatGPT, Claude, or Gemini. No formatting required.
Our tool rewrites it using prompt-engineering best practices — adding role, context, constraints, and output format.
Paste the rewritten prompt into your AI of choice. Same model, sharper results.
7-day trial, cancel anytime
Improve My Prompt is a free tool that rewrites your prompt for clarity, specificity, and structure — so you get better results from ChatGPT, Claude, Gemini, or any LLM. It applies prompt engineering best practices like adding role context, constraints, output format, and concrete examples. Learn more in the OpenAI prompt engineering guide.
Prompt optimization is the practice of rewriting AI prompts to produce clearer, more reliable outputs. An optimized prompt adds four things most prompts skip: a defined role, specific context, output format, and examples. Better-structured prompts produce better answers from any LLM – ChatGPT, Claude, Gemini, or open-source models like Llama and Mistral. Some people call this AI prompt optimization or prompt engineering – same concept, different labels.
Paste your prompt into the input box and click Improve. The tool returns a clearer, more specific version based on prompt-engineering best practices — usually with added role, context, constraints, and output format. Copy-paste the rewritten prompt into ChatGPT or any AI chatbot.
This tool was created with CustomGPT.ai’s no-code builder. It uses CustomGPT.ai’s Persona feature and OpenAI’s prompt engineering best practices.
Three steps: (1) Add a role – “You are a [profession]…” – so the model knows whose perspective to take. (2) Add constraints – desired length, format, tone, and what to avoid. (3) Add examples or context the model needs to produce the output. Or paste your prompt into the tool above – it applies all three automatically, based on OpenAI’s prompt engineering guide. If you are optimizing a page for AI visibility too, run the free AEO audit.
No — this tool is completely free, no signup required. If you’d like to build similar tools without coding, you can .
Yes. You’re free to use the improved prompts in commercial work — client projects, internal tools, paid products. The tool itself is free with no rate limits for normal use. If you want to embed prompt-improvement inside your own product, see .
Any LLM. CustomGPT.ai’s optimizer outputs plain-text prompts that work with ChatGPT, Claude, Gemini, and other LLMs. The framework is model-agnostic because it follows OpenAI’s prompt engineering principles (role, context, format, examples) which apply to any large language model. The same optimized prompt produces consistent improvements whether you paste it into ChatGPT, Claude, Gemini, or any other model.
ChatGPT requires the user to know prompt engineering: what to include, how to structure context, when to add examples. The Improve My Prompt tool applies these techniques automatically, based on OpenAI’s prompt engineering guide. Output quality stays consistent regardless of who’s writing the prompt: a marketer, developer, support agent, or student all get the same production-grade results without needing to learn prompt engineering theory first.
Please — we usually reply within one business day.
CustomGPT does not store your prompts. Inputs are processed in-memory and discarded. Your data is never used to train any AI model.
For full details on our security and privacy practices, see our Security & Privacy center.
Yes. CustomGPT’s no-code platform builds AI agents trained on your documents, websites, and knowledge bases, with average deployment time in minutes. Teams like NonprofitAMA and Dlubal Software have deployed CustomGPT agents handling thousands of customer questions. Elizabeth Planet at NonprofitAMA reported “the answers improved tremendously” after connecting curated sources to her CustomGPT agent.
The improve-my-prompt tool is free and requires no signup. CustomGPT plans start at $99/month for Standard (or $89/month billed annually), with a 7-day free trial. See pricing for full details.
