Developer Docs

Build with QR Gen

Free QR code API. No auth, no signup. Generate QR codes from any language, framework, or AI agent.

API Reference GET/POST endpoints, parameters, response formats, code examples in JS, Python, curl, and Go. LLM Integration Function calling schemas, MCP server setup, system prompts for giving AI agents QR capabilities. Claude Code Bash tool usage, MCP server config, and example conversation flows for Anthropic's CLI. OpenAI Codex Custom GPT actions, Assistants API, Responses API, and function calling examples.

Quick Start

curl "https://qrgenapp.com/api/qr?data=hello&format=png" -o qr.png

That's it. No API key, no signup. Returns a PNG image directly.