CraftPrompts

Gemini prompt generator

Builds prompts around the four parts Google’s Gemini prompting guide names: persona, task, context and format. It also covers the constraints and examples that Gemini follows closely.

Start from

Your prompt
roletaskcontextformattonerulesexample
Fill in a few fields and your prompt is set here, line by line.
0 words · 0 characters

Prompt score

Underspecified

0 words

  • Clear task verb missingStart with an explicit action: “Write…”, “Summarize…”, “Compare…”.
  • Background or context missingSay who it is for and why you need it; models fill gaps with generic guesses.
  • Role or perspective missingGive a perspective: “You are a senior UX writer…”. It sets vocabulary and depth.
  • Output format stated missingName the shape of the answer: table, bullets, JSON, 3 paragraphs.
  • Length or scope limit missingCap the length: “under 150 words”, “5 bullets”.
  • Constraints or rules missingAdd rules: what to avoid, what must be included, reading level.
  • Example or reference missingShow one example of the output you want. Few-shot beats description.
  • Specific, not vague missingReplace vague words (good, nice, interesting) with concrete criteria.

Let AI polish it

Sends your filled-in fields to the AI helper, which writes a complete prompt and marks gaps as [placeholders].

Prompting Gemini well

Persona, task, context, format

Google’s “Prompting guide 101” for Gemini in Workspace frames good prompts with these four elements and notes that most effective prompts use around 21 words or more of real detail. The generator gives each one a field.

Use Gemini’s strengths

Gemini works well with long inputs: paste whole documents into Context and ask for specific extraction or comparison. In Gemini apps you can also reference Google Docs or Gmail with @, so name the file you want it to use.

Ask for a structure

Gemini follows explicit output formats closely. Ask for a table with named columns, or JSON with named keys, rather than “organise this”.

Iterate in the same chat

Follow-up instructions like “make it shorter” or “use a more formal tone” work well in Gemini and are cheaper than rewriting the whole prompt.

New to structured prompts? The prompt engineering guide explains each part, and the prompt optimizer scores any prompt you already have.

Questions

How do I write a good prompt for Gemini?

State a persona (“You are a program manager”), a specific task, the context Gemini needs, and the format you want the answer in. Google’s Gemini prompting guide recommends natural language, full sentences and specific detail, and suggests iterating with follow-up prompts.

Is a Gemini prompt different from a ChatGPT prompt?

The fundamentals are the same: a clear task, context, format and constraints work for both. The differences are in features: Gemini can pull from Google Workspace files and handles very long inputs, so prompts often reference documents directly.

Does this work for Gemini in Google Docs and Gmail?

Yes. Use the Context field to describe or reference the document and the Format field to describe the output (an email reply, a summary table). Paste the result into the Gemini side panel.

Is the Gemini prompt generator free?

Yes. The builder runs in your browser for free, and the optional AI polish has a fair-use limit. No account is needed.

Prompt generators for other models

ChatGPT · Claude · Grok · DeepSeek · Perplexity · Nano Banana · Veo 3 · Suno · Midjourney · Stable Diffusion

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