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Custom GPT instructions counter

Write or paste your instructions and watch the count against the limit, so they save the first time. Works for custom GPTs and ChatGPT custom instructions.

Free tool · Updated

What you're writing
A GPT's Instructions field takes up to 8,000 characters.

0 of 8,000 characters · 8,000 left

0

Characters

8,000

Left

0

Words

0

Tokens (estimate)

Emoji and some symbols can count as two characters, so leave a little room.

How to use it

  1. Pick what you're writing: a custom GPT, or ChatGPT custom instructions for your plan.
  2. Paste or write your instructions.
  3. Watch the bar. It turns amber near the limit and red when you're over.

Tips

  • Over the limit? Cut examples first, then repeated rules, then long explanations.
  • Move reference material into a Knowledge file and tell the GPT when to use it.
  • Bullets say the same thing in fewer characters than paragraphs.
  • Leave a little room for edits later.

Frequently asked questions

What is the custom GPT instructions limit?

8,000 characters in the Instructions field of the GPT builder. Longer text won't save.

What is the ChatGPT custom instructions limit?

1,500 characters per field on Free and Go. Since July 2026, Plus, Pro, Business, Enterprise and Edu plans get 5,000 characters per field, according to OpenAI's help center.

How do I fit more into a GPT?

Put long reference material, like product details or style guides, in Knowledge files. Keep the instructions for behavior and rules.

Is my text sent anywhere?

No. Counting happens in your browser.

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