# Custom GPT Instructions Counter

> Count your custom GPT instructions against the 8,000-character limit, or ChatGPT custom instructions against 1,500 or 5,000, as you type. Free and private.

Canonical: https://promptitin.com/free-tools/custom-gpt-instructions-counter
Last updated: 2026-11-13

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.

This is an interactive tool. Use it at https://promptitin.com/free-tools/custom-gpt-instructions-counter.

## 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.

## FAQ

### 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.

## Related

- [ChatGPT Custom Instructions Generator](https://promptitin.com/free-tools/chatgpt-custom-instructions-generator)
- [System Prompt Generator](https://promptitin.com/free-tools/system-prompt-generator)
- [ChatGPT Character Counter](https://promptitin.com/free-tools/chatgpt-character-counter)
- [AI Token Counter](https://promptitin.com/free-tools/ai-token-counter)