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ChatGPT Custom Instructions Generator

Write both custom instruction boxes, each checked against the 1,500 character limit.

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What ChatGPT should know about you

How ChatGPT should respond

Quick Tool Overview

The ChatGPT Custom Instructions Generator writes both personalization boxes — what ChatGPT should know about you and how it should respond — from a few choices, with a live counter keeping each box under the 1,500 character limit.

What it does
Writes ChatGPT custom instructions for both boxes
You give it
Your role, tools, work and response preferences
You get back
Two ready-to-paste instruction blocks
Best for
Getting better default answers in every new chat
AI Tools Free, unlimited use No sign-up Runs in your browser

About the ChatGPT Custom Instructions Generator

Custom instructions are the two boxes in ChatGPT settings that apply to every new chat: what ChatGPT should know about you, and how you want it to respond. Filled in well, they remove the preamble, the over-explaining and the constant reformatting. Left empty, every chat starts from a generic reader.

This generator writes both boxes from a few choices — your role, the tools you work with, what you are working on and how much to assume you know, then length, tone, formatting, code style and the habits you want gone. The wording is written to be enforceable: instructions about form rather than virtues, which is what a model can actually follow.

Each box has a live counter against the 1,500 character limit ChatGPT enforces, so nothing is cut off when you save. Presets for developers, marketers, students and founders give you a strong draft in one click. The same text works in the personal preferences setting in Claude.

Key features of the ChatGPT Custom Instructions Generator

Both boxes at once

About you and how to respond are generated separately, each with its own copy button.

Live 1,500 character counters

A bar for each box turns amber near the limit and red once over it.

Enforceable wording

Instructions describe form — answer first, no bolded labels — which models can actually follow.

Presets for common roles

Developer, marketer, student and founder profiles give a strong first draft.

Works in Claude too

The same text fits the personal preferences setting in Claude.

How to use the ChatGPT Custom Instructions Generator

  1. 1

    Pick a preset or start blank

    Presets fill every field with a realistic profile you can edit.

  2. 2

    Describe yourself

    Your role, your tools, your current work and how much to assume you already know.

  3. 3

    Choose how it responds

    Length, tone, formatting, code style, and anything it should never do.

  4. 4

    Paste each box into ChatGPT

    Settings, Personalization, Custom instructions. Both counters must be under 1,500.

Frequently asked questions

On the web, open Settings, then Personalization, then Custom instructions. On mobile, tap your name and look under Personalization.

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