Postman to OpenAPI Converter

Convert Postman to OpenAPI 3.0 online—paste a Postman collection JSON and export a clean OpenAPI spec.

Tool workspace

Idle

Local-only. Nothing is uploaded.

OpenAPI title

Leave blank to use collection name.

Version

Defaults to 1.0.0.

Server URL

Optional. Used when no baseUrl variable exists.

Output

Pretty print

Group by folder (tags)Include headers

Input

Postman Collection JSON

Input

Postman Collection JSON

Output

OpenAPI 3.0 JSON

Results

Validation summary and warnings

Paste a Postman collection and click Convert.

Outputs are best-effort. Review before production use.

Process

How it works

Export Collection

Export your Postman collection JSON (v2.0 or v2.1).

Paste & Configure

Paste the collection JSON, set title/version/server, and review.

Convert to OpenAPI 3.0

Convert Postman collection to OpenAPI 3.0 and export the spec.

Download or Copy

Download openapi.json/openapi.yaml or copy the output.

Use Cases

Common use cases

Convert Postman collection JSON to OpenAPI 3.0 specs

Migrate Postman workflows to Swagger/OpenAPI documentation

Generate OpenAPI specs for API gateways and tooling

Standardize API docs across backend and frontend teams

Create SDKs and clients from OpenAPI output

Share API contracts with partners and internal teams

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