Swagger 2.0 to OpenAPI 3.0

Convert legacy Swagger 2.0 specs to OpenAPI 3.0 JSON — paths, definitions, and servers mapped locally.

100% In-Browser & Private — your data never leaves this device
Loading tool...

How to use Swagger → OpenAPI

  1. Paste a Swagger 2.0 JSON or YAML document.
  2. Review the converted OpenAPI 3.0 output.
  3. Download and use with OpenAPI 3-only tools.

FAQ

Are all Swagger features converted?
Common paths, definitions, parameters, and security schemes are mapped. Review complex legacy specs manually.

Related tools

More private, in-browser utilities you might need next.

OpenAPI Spec Visualizer & Validator
Validate OpenAPI and Swagger specs and explore paths, operations, schemas, and servers — fully client-side.

developer

OpenAPI to Postman Collection
Convert OpenAPI 3 specs to Postman Collection v2.1 JSON — import without uploading your API definition.

developer

OpenAPI to TypeScript & Zod
Generate TypeScript interfaces and Zod schemas from OpenAPI 3 component definitions — private, instant, in-browser.

developer

Looking for more? Browse all developer tools · All tools