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Convert OpenAPI to Markdown

Turn an OpenAPI 3.0 or 3.1 spec, in JSON or YAML, into readable Markdown API reference documentation: endpoints, parameters, request and response details, and schemas. Everything runs in your browser; nothing is uploaded.

  • Always free
  • No uploads
  • No sign-up
  • No tracking

OpenAPI to Markdown conversion turns an OpenAPI specification, the machine-readable file that describes a REST API's endpoints, parameters, and responses, into readable Markdown documentation you can drop into a README, a wiki, or a docs site. An OpenAPI to Markdown converter reads the spec (in JSON or YAML, version 3.0 or 3.1) and generates a structured API reference: a section per endpoint with its method, path, request parameters, request and response schemas, and status codes, laid out as headings, tables, and code blocks.

This tool runs entirely in your browser. The specification is parsed on your own device and never uploaded to a server, so private or internal API definitions stay with you. There is no account, no install, and no command-line step: open or paste a spec, and the Markdown is ready to copy.

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Drop a .json, .yaml, or .yml spec here or click to upload .json, .yaml, .yml
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OpenAPI to Markdown Docs

An OpenAPI spec (also called Swagger) describes a REST API in JSON or YAML. This tool reads a version 3.0 or 3.1 spec in your browser and writes readable Markdown reference documentation from it. Nothing is uploaded.

What it produces

  • An overview from the info block: title, version, description, and any contact, license, or terms links.
  • Servers and authentication: the base URLs and a summary of the security schemes the API uses.
  • An endpoint section for every path and method, with a parameters table, the request body, and a responses table.
  • A schema section for each model under components, shown as a properties table. Models are documented once and referenced by name.

JSON and YAML notes

  • Both formats work. Paste or drop a .json, .yaml, or .yml spec. JSON is read instantly; YAML loads a small parser the first time you convert one.
  • References are followed. A $ref that points inside the document (like #/components/schemas/Pet) is resolved. A recursive model is shown by name instead of expanding forever.
  • You can paste, too. Drop the spec straight into the box instead of uploading a file.
Tip: the output is plain Markdown, so it drops straight into a README, a wiki, or a docs site, and reads well in an LLM prompt.

Limits & privacy

  • OpenAPI 3.0 and 3.1 only. Swagger 2.0 is not supported yet; convert it to OpenAPI 3 first (many editors do this automatically).
  • Nothing is fetched. A $ref to an external file or URL is left as text and never loaded, and server URLs are shown but never called. The spec cannot make the page reach out to the network.
  • Links are screened. Any URL from the spec is checked, and unsafe targets such as javascript: are neutralized so the copied file is safe to reuse.
  • Privacy: the spec is read and converted entirely in your browser. Nothing is uploaded.

How do I convert OpenAPI to Markdown?

1

Add your spec

Paste your OpenAPI spec into the box, or drop a .json, .yaml, or .yml file onto the upload strip. It is read in your browser; nothing is uploaded.

2

Let it build the reference

Endpoints, parameters, request and response details, and schemas are laid out as Markdown, with internal references resolved.

3

Copy or download the Markdown

You get a clean API reference document. Copy the result or download it as a .md file.

Frequently asked questions

Which OpenAPI versions are supported?

OpenAPI 3.0 and 3.1, in JSON or YAML. Swagger 2.0 is not supported yet; if you have a 2.0 spec, convert it to OpenAPI 3 first, which many editors do automatically.

Does it support Swagger 2.0 (OpenAPI 2.0)?

This tool supports OpenAPI 3.0 and 3.1. For a Swagger 2.0 spec, convert it to 3.x first, then paste it here. 2.0 support is planned.

Does it read YAML as well as JSON?

Yes. Paste or drop a .json, .yaml, or .yml file. JSON is read instantly; for YAML a small parser loads the first time you convert one, and it still runs entirely in your browser.

How are $ref references handled?

References that point inside the document, such as #/components/schemas/Pet, are resolved so the shape is shown where it is used. A schema that references itself is shown by name rather than expanded, so recursive models stay readable. References to external files or URLs are left as text and never fetched.

What does the output include?

An overview from the info block, the servers and authentication schemes, a section for each endpoint with a parameters table and request and response details, and a section for each schema under components shown as a properties table.

Is my spec uploaded anywhere?

No. The spec is read and converted entirely in your browser. The tool never fetches an external reference, loads an image, or calls a server URL from the spec.

Last updated: June 28, 2026