Browse OpenAPI / Swagger specs
Paste an OpenAPI or Swagger spec and instantly browse endpoints, schemas, parameters, and response models in a clean interface.
Test API endpoints interactively
Use the interactive try-it-out mode to fill in parameters and send real requests to your API directly from the documentation.
Visualize API structure
See all endpoints grouped by tag with their HTTP methods, paths, request bodies, and response codes at a glance.
Share API documentation
Render a spec into readable docs that you can share with teammates or customers without standing up a hosted documentation site.
Validate OpenAPI syntax
Catch syntax errors and missing required fields with line-number reporting before sharing or deploying your spec.
OpenAPI Doc Viewer runs entirely in your browser tab. No data is uploaded, no server processes your input, and no account is required.
Encode and decode Base64 for text, files, images, audio, and video.
Encoding & Data
Format, validate, minify, and explore JSON with tree, table, and map views.
Encoding & Data
Decode, verify (HMAC/RSA/ECDSA), encode, and compare JWTs side-by-side.
Security & Auth
Decode SSL/TLS certificates, chains, SANs, and fingerprints.
Security & Auth