一つのアイデアから。あらゆるAIに対応。
欲しいものを一度説明するだけ。ChatGPT、Gemini、Midjourney、Claude、Flux向けに最適化された、すぐに使えるプロンプトを無料・即座に・ログイン不要で取得できます。
使い方
アイデアからあらゆるAIツールに貼り付け可能なプロンプトまで、たった3ステップ。
アイデアを説明
サムネイル、ロゴ、キャプション、画像など、欲しいものを簡単な言葉で入力してください。
AIモデルを選択
生成対象のツールを選択します。それぞれ独自のスタイルに合わせて調整されたバージョンが生成されます。
コピーして使用
出力結果をそのままChatGPT、Midjourney、Geminiなど必要な場所に貼り付けてください。
主要なAIすべてに対応
一つの入力から、各モデルの強みとスタイルに合わせた出力を生成します。
Why the same prompt doesn't work on every AI
ChatGPT, Gemini, and Claude follow conversational instructions — they read your goal, your context, and your formatting requests. Image models like Midjourney and Flux don't "understand" instructions the same way: Midjourney rewards a comma-separated, keyword-and-parameter style, while Flux responds better to full descriptive sentences. Reusing one prompt everywhere is the single biggest reason people get disappointing results from AI tools — which is exactly what this AI prompt generator is built to fix, by writing a version tuned to each model automatically.
Quick prompt-writing tips
- Be specific about the output, not just the topic — state the goal, the format, and the length you want.
- Give chat models a role when it helps ("act as an experienced copywriter") to shift tone and quality.
- For image prompts, order matters — put the subject first, then style and technical details.
- Iterate instead of starting over — use the Improve tab to make an existing prompt more detailed, cinematic, or concise.
Frequently asked questions
What is an AI prompt generator?
A tool that takes one plain-language idea and rewrites it as an optimized prompt for a specific AI model — matching that model's own style, whether it's a conversational instruction for ChatGPT or a keyword-style prompt for Midjourney.
Is this AI prompt generator free?
Yes. You get a set number of free generations every day with no account or signup required.
Which AI models are supported?
ChatGPT, Gemini, Claude, Midjourney, and Flux — with tuned prompt styles for each, generated from a single idea.
Can I improve a prompt I already wrote?
Yes — switch to the Improve Prompt tab, paste your existing prompt, and choose how you want it changed (more detailed, more cinematic, more concise, and more).