Which Postman collections are supported?

Collection v2.0 and v2.1 JSON, as exported from Postman with Export → Collection v2.1. Folders become OpenAPI tags, :id and {{id}} path segments become path parameters, and {{baseUrl}} style hosts become server variables with the collection's variable values as defaults.

Are request and response bodies included?

Yes. JSON bodies become a schema inferred from the example plus the example itself, form bodies become form schemas, and saved example responses become responses with their status codes. Review the generated schemas: they are inferred from single examples.

How do I convert Postman collection to OpenAPI YAML?

Upload your Postman collection file above, click Convert, and download the OpenAPI YAML result instantly. No account or software needed.

Is converting Postman collection to OpenAPI YAML free?

Yes. It is free and unlimited for files up to 5 MB, with no account required. Larger files get 3 free conversions per day; beyond that, credit packs start at $3 and credits never expire.

Are my files stored or shared?

No. Files are processed in server memory and deleted immediately after conversion. File contents are never written to disk or retained.

Do I need to install anything?

No software installation needed. OmniConvert runs in the browser — just upload, convert, and download.

OmniConvert

Convert Postman Collection to OpenAPI

Free

Convert a Postman collection (v2.0 / v2.1) to an OpenAPI 3.0 YAML spec with paths, parameters, bodies and examples

Drop a file or click to browse

Accepted: .json

or paste below

Free and unlimited for files up to 5 MB. No account needed.

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About this conversion

Convert a Postman collection (v2.0 / v2.1) to an OpenAPI 3.0 YAML spec with paths, parameters, bodies and examples. This converter processes your Postman collection file server-side and returns a OpenAPI YAML file instantly — no account, no software installation, and no file storage. Files are deleted from our servers immediately after conversion.

How to convert Postman collection to OpenAPI YAML

1. Upload — drag your Postman collection file onto the converter above, or click to browse.
2. Convert — press Convert. Processing happens on secure servers in seconds.
3. Download — your OpenAPI YAML file downloads automatically. No sign-up required.

Convert Postman collection to OpenAPI YAML from the command line

curl --fail-with-body \
  -H "Authorization: Bearer YOUR_TOKEN" \
  -F "file=@input.json" \
  -F "conversionId=postman-to-openapi" \
  https://www.omniconvert.cloud/api/convert -o output.yaml

The API needs a token from a credit pack, and each API conversion uses one credit. Converting on this page stays free. API documentation

Frequently Asked Questions

Which Postman collections are supported?: Collection v2.0 and v2.1 JSON, as exported from Postman with Export → Collection v2.1. Folders become OpenAPI tags, :id and {{id}} path segments become path parameters, and {{baseUrl}} style hosts become server variables with the collection's variable values as defaults.
Are request and response bodies included?: Yes. JSON bodies become a schema inferred from the example plus the example itself, form bodies become form schemas, and saved example responses become responses with their status codes. Review the generated schemas: they are inferred from single examples.
How do I convert Postman collection to OpenAPI YAML?: Upload your Postman collection file above, click Convert, and download the OpenAPI YAML result instantly. No account or software needed.
Is converting Postman collection to OpenAPI YAML free?: Yes. It is free and unlimited for files up to 5 MB, with no account required. Larger files get 3 free conversions per day; beyond that, credit packs start at $3 and credits never expire.
Are my files stored or shared?: No. Files are processed in server memory and deleted immediately after conversion. File contents are never written to disk or retained.
Do I need to install anything?: No software installation needed. OmniConvert runs in the browser — just upload, convert, and download.

No account needed · Credits never expire · Share your token link across devices