AI Prompt Optimizer
Improve your prompts in 1 click
Got a prompt that's not giving the result you want? Paste it below and our AI will improve it instantly by adding the missing role, context, constraints and output format. Iterate as many times as you want. 100% free, no signup.
Starting from scratch?
If you don't have a prompt to improve yet, use our Builder to assemble a prompt step by step (role, context, instruction, format).
Before/After examples
Here are 3 examples of prompts optimized by our tool to give you an idea of the expected result.
Before
Write an email to a customer
After
As a sales manager with 10 years of B2B experience, write a professional and warm follow-up email to a customer who hasn't replied to our quote for 7 days. Format: catchy subject (max 10 words), 3 short paragraphs (250 words max), clear call-to-action at the end. Tone: empathetic, no sales pressure.
Before
Summarize this article
After
As a press editor specialized in synthesis, summarize the following article for an audience of busy executives. Format: 1 hook sentence, 3 bullet points with key insights, 1 actionable conclusion. Maximum 150 words. Keep only key figures and essential proper nouns. Do not rephrase the author's opinions, paraphrase them.
Before
Give me LinkedIn content ideas
After
As a B2B content marketing strategist with personal branding expertise, propose 10 LinkedIn post topics for [PROFESSION] aiming to attract [TARGET PERSONA]. Format: markdown table with columns "Angle", "Hook (first sentence)", "Post type" (storytelling / list / opinion / question), "Goal" (engagement / lead / authority). Mandatory mix: 4 storytelling, 3 actionable lists, 2 sharp opinions, 1 open question.
How to optimize a prompt effectively
A prompt that works relies on five levers. Our optimizer applies them automatically — here is what it concretely adds to your text, and what you can reproduce by hand:
- 1
An expert role
The prompt states who answers ("As a senior copywriter…"). The AI picks the right vocabulary and domain reflexes.
- 2
Precise context
We add the target audience, the goal and the project constraints. The less the AI has to guess, the more accurate the answer.
- 3
Structured instructions
The request is broken into clear directives instead of a vague sentence: one idea per instruction.
- 4
A defined output format
Table, bullet points, word count, sections: we state exactly what the answer should look like.
- 5
Constraints and advanced techniques
Tone, length and style, plus techniques like few-shot (examples) or chain-of-thought (step-by-step reasoning) when useful.
Go further
To go further, read our guide on how to optimize your AI prompts and the anatomy of a perfect prompt, learn to prompt Claude effectively, or grab ready-to-use templates from our free prompt library.
Frequently asked questions
How does the prompt optimizer work?
You paste your prompt in the textarea, click "Optimize with AI", and our AI analyzes the weaknesses (missing role, context, format) and rewrites an improved version in a few seconds. You can iterate multiple times on the result.
Is the prompt optimizer free?
Yes, 100% free and no signup. You can run up to 10 optimizations per day from the same IP. Beyond that, wait 24h or create an account.
Which AI models can use the optimized prompt?
The optimized prompt works with any AI model: ChatGPT (GPT-4, GPT-5), Claude (Sonnet, Opus, Haiku), Gemini (Pro, Flash), Mistral, Llama, etc. The optimization principles (clear role, precise context, defined format) are universal.
How many iterations to get a good prompt?
Generally, 1 to 2 iterations are enough to transform a vague prompt into an expert one. Beyond 3 iterations, it's better to manually adjust the details rather than letting the AI keep rephrasing.
Why optimize a prompt rather than writing it directly?
Writing a good prompt from scratch requires experience and time (5-10 minutes). Optimizing via AI takes 5 seconds and automatically applies expert techniques (role prompting, few-shot, chain-of-thought) you might not use otherwise.