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Turn a Custom GPTinto a Claude Skill.

A Custom GPT is a prompt, some starters and a few files. So is a Claude Skill. Paste the configuration below and download a zip you can upload to Claude. Your instructions and files never leave this page: the conversion happens in your browser, and there is no server to send them to.

Copy the Configure tab
Open your GPT in the editor and copy the name, description and instructions out of the Configure tab.
Paste and add files
Paste them here with the conversation starters, and drop in any knowledge files the GPT used.
Download and upload
Download the zip and upload it to Claude as a skill. The preview shows exactly what you are getting.

GPT configuration

Copy these out of the Configure tab in the GPT editor.

Namebecomes my-skillDescription0 / 1024Instructions 0 charactersConversation startersone per line

Capabilities

Web SearchCode InterpreterDALL-E image generation not supportedActions (API integrations) not supported

Knowledge filespacked into references/

Drop files here, or

They stay in this browser. Nothing is uploaded.

Preview

my-skill/SKILL.md

---
name: my-skill
description: >-
  Use when the user asks about this skill. Converted from a ChatGPT Custom
  GPT, so the trigger wording is a guess: rewrite it to say exactly when
  Claude should load this skill.
---

# my-skill

<!-- Paste the Custom GPT instructions here. -->

## Converted from a Custom GPT

Converted by gpt2skill on the Rethinksoft site. Two things are worth checking before you rely on it:

1. The description above decides when Claude loads this skill. Make it say when to use it, not what it is.
2. A Custom GPT's instructions often address a chat window. Anything phrased as "in this GPT" or "as this assistant" reads oddly in a skill and is worth rewording.

Instructions are required. They become the body of the skill.
No name given, so the skill will be called my-skill.
No description given. One is written for you, but Claude uses it to decide when to load the skill, so rewrite it.

Then open Claude settings and upload the zip as a skill.

What does not carry over. Actions become an MCP server, not part of a skill. Image generation has no equivalent. Web search and code execution depend on where Claude is running rather than on anything in the skill.

Built by Rethinksoft. Not affiliated with OpenAI or Anthropic. If you would rather have an agent than a skill, try one of ours.