# OpenAPI & Swagger Tools

> Whether you're starting from nothing, already have a Swagger or OpenAPI file, or inherited a spec you don't understand, these tools cover the spec lifecycle: generate one from plain English, edit and preview it live, validate and autofix it, or get a plain-English explanation of one you didn't write.

## Tools

- [OpenAPI Editor and Visualizer](https://www.postman.com/tools/openapi-editor-and-visualizer): Postman’s free OpenAPI Editor lets you write or paste a definition, open a local file, or import one from a URL; it supports Swagger 2.0 and OpenAPI 3.0, 3.1, and 3.2 in YAML or JSON, renders visual documentation instantly, flags syntax and built-in governance issues as you write, and requires no account or installation.
- [OpenAPI validator](https://www.postman.com/tools/openapi-validator): The OpenAPI validator checks an OpenAPI definition for syntax and schema errors, then scores its design out of 100 against a style guide of API best practices, listing every violation grouped by rule and auto-fixing the mechanical ones in place.
- [API Designer](https://www.postman.com/tools/api-designer): API Designer turns a plain-English description of an API into a working OpenAPI 3.1 starter specification, with paths, operations, schemas and responses already filled in.
- [Understand your API](https://www.postman.com/tools/understand-your-api): Understand your API reads an OpenAPI specification and explains in plain English what the API does, how authentication works, and what a consumer needs to know before integrating.

## About

- No account is required and there is nothing to install. Each tool's Privacy section explains what stays in your browser and what is sent to Postman.
- [Postman Tools](https://www.postman.com/tools) — every tool, not just this group.
- [llms.txt](https://www.postman.com/tools/llms.txt) — the same index in llms.txt form.