Free AI prompt generator

WriteMyAIPrompt is a free tool that turns a rough idea into a structured, professional-grade AI prompt for Claude, ChatGPT, Gemini, or an image model — with no sign-up and no cost. Describe what you want in plain language and it returns a structured prompt with the role, context, constraints, and output format filled in — plus a score showing exactly what is still missing.

No sign-upNo API keyRuns in your browserFree forever

The builder is being wired up

The prompt engine behind this site is built and tested — twelve task types, five model syntaxes, and a transparent scoring rubric. The interface for it is next. In the meantime, the guides below cover the same ground the engine applies automatically.

What makes an AI prompt strong?

A strong prompt is specific about the task, supplies the background the model does not have, defines the shape of the answer, bounds it with explicit rules, shows an example, and states how the result will be judged. WriteMyAIPrompt scores every prompt against those six dimensions, weighted as follows.

Specificity25 points: How precisely the task is stated: its length, whether it names concrete details such as numbers or proper nouns, and whether it leans on vague qualifiers.
Context15 points: Whether the model is given the background and the intended reader it needs.
Output format20 points: Whether the shape of the answer is defined: format, output type, length, and tone.
Constraints15 points: How many explicit rules and exclusions bound the output.
Examples15 points: Whether the prompt shows the model what a correct answer looks like.
Success criteria10 points: Whether the prompt states how the output will be judged.

The score rates the brief you supply, not the prompt the tool produces. Restructuring your words adds no information you did not give, so the number only moves when you add something real.