Free ChatGPT Custom Instructions Generator

Q: How do I use the Claude Project instructions generator?

Switch to the Claude Project Instructions tab. Fill project purpose, how Claude should behave, knowledge notes, and output preferences. Build, copy, then paste into your Claude Project → Instructions → Save. Upload files separately under Project knowledge.

Q: How is this different from a generic AI prompt generator?

It focuses on the system layer — the block you set once so every chat starts consistent. Day-to-day user prompts still go in the chat box. Claude mode follows Project-style fields (purpose, behavior, knowledge, output).

A free ChatGPT custom instructions generator (and Claude Project instructions mode) that turns a short form into a paste-ready system prompt — in your browser, with no signup.

Pick ChatGPT Custom Instructions or Claude Project instructions. Formatting only: no API call, no account, nothing leaves your browser.

What it is: a ChatGPT custom instructions generator with a built-in Claude project instructions generator.

Who it’s for: English-speaking solo founders who rewrite the same “who you are” block every week.

How it works: pick a mode → fill the form → Build → Copy → paste into Settings or Project Instructions.

Build your ChatGPT custom instructions

Presets

Role / job Audience Tone What it should do Hard rules / constraints Output format

Your paste-ready system prompt

Tip: paste into ChatGPT → Settings → Personalization → Custom Instructions, or into a Custom GPT system field. Then send a short first message with the real task.

How to use this custom instructions generator

Pick ChatGPT Custom Instructions or Claude Project Instructions, then use a preset or fill the fields.

Click Build prompt, then Copy.

Paste into ChatGPT Custom Instructions, a Custom GPT, or Claude Project → Instructions → Save.

This is a formatting helper — a free system prompt generator with no signup, no API call, and no stored text. Use the Claude tab whenever you need a claude project instructions generator without starting from a blank box.

FAQ

Is this ChatGPT custom instructions generator free?

Yes. No account, no credits, no paywall. Open the page, fill the fields, copy the result.

Do I need to sign up?

No. This is a free system prompt generator with no signup. There is no login and no email capture — you use it in the browser and leave when you are done.

What’s the difference between ChatGPT custom instructions and a system prompt?

They are the same kind of text: a standing “who you are / how to answer” block that shapes every reply. ChatGPT stores it under Settings → Custom Instructions (or a Custom GPT’s instructions). Claude and many bots call the same block a system prompt or Project instructions. This tool writes that block once so you can paste it anywhere.

Where do I paste the output in ChatGPT?

Settings → Personalization → Custom Instructions (on mobile: Settings → Customize ChatGPT). You can also paste it into a Custom GPT’s instructions field.

How do I use the Claude Project instructions generator?

Switch to the Claude Project Instructions tab. Fill project purpose, how Claude should behave, knowledge notes, and output preferences. Build, copy, then paste into your Claude Project → Instructions → Save. Upload files separately under Project knowledge.

Can I use this as a Claude project instructions builder?

Yes. Use the dedicated Claude mode for a Project-shaped block, or paste a ChatGPT-mode output into Claude if you prefer. Shorten a few lines if you hit a character limit.

Does it work for Gemini too?

Yes. The ChatGPT-mode output also works as a Gemini system instruction. Tweak wording if a platform has a character limit.

Is my text uploaded or saved?

No. Everything runs in your browser. Close the tab and the text is gone.

How is this different from a generic AI prompt generator?

It focuses on the system layer — the block you set once so every chat starts consistent. Day-to-day user prompts still go in the chat box. Claude mode follows Project-style fields (purpose, behavior, knowledge, output).