Compare Swagger Viewer with other tools. See why developers choose this free browser-based option.
100% free, no signup required. Works entirely in your browser.
Open Swagger ViewerSet up your API request or data.
Run or process the request.
See the formatted response.
Yes, the Swagger Viewer is completely free with no restrictions on specification size or complexity. Explore any OpenAPI/Swagger specification without limitations. All OpenAPI 2.0 (Swagger) and OpenAPI 3.0/3.1 features are fully supported.
The Swagger Viewer primarily renders and displays API documentation from your specification. It can optionally send test requests to endpoints defined in the spec using the 'Try it out' feature, similar to Swagger UI. This lets you interactively test your API endpoints directly from the documentation.
The viewer supports OpenAPI 2.0 (Swagger), OpenAPI 3.0, and OpenAPI 3.1 specifications in both JSON and YAML formats. It renders all standard OpenAPI features including paths, schemas, authentication schemes, request/response examples, and server definitions with a clean, navigable interface.
