OpenAPI (formerly Swagger) is a standard format for describing RESTful APIs. It allows you to define endpoints, parameters, authentication, and response structures in a machine-readable JSON or YAML file. Tools like this generator help you visualise and share your API documentation.

Yes! Our tool supports both JSON and YAML. Simply paste the content, upload a .yaml file, or provide a URL that returns YAML. The parser automatically detects the format and converts it internally.

Absolutely no data leaves your browser. All parsing and HTML generation happens locally on your machine. We do not store, transmit, or analyse your OpenAPI files. You can inspect the page's network activity to verify this.

Definitely. Once the preview is generated, you can copy the entire HTML snippet using the “Copy HTML” button and embed it in any webpage, Confluence page, or static site. It’s completely self‑contained.

Due to browser security policies (CORS), many APIs block direct access from other websites. If the URL does not allow cross-origin requests, the fetch will fail. As a workaround, download the file and upload it directly or paste its content.