> ## Documentation Index
> Fetch the complete documentation index at: https://bruno-a6972042-docs-api-docs-split-more-menu.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Formats

The specifications and formats Bruno collections are built on, and the tools
for bringing collections in from other API clients.

<CardGroup cols={2}>
  <Card title="OpenAPI" icon="brackets-curly" href="/open-api/overview">
    Import OpenAPI 2.0/3.x specs as collections, export collections as specs,
    design OAS files, and keep collections in sync with a remote spec.
  </Card>

  <Card title="OpenCollection YAML" icon="file-lines" href="/opencollection-yaml/overview">
    The recommended YAML-based open specification for new collections —
    structure reference and samples.
  </Card>

  <Card title="Converters" icon="right-left" href="/converters/overview">
    Convert collections from Postman, Insomnia, OpenAPI, and WSDL into Bruno
    format.
  </Card>

  <Card title="Bru Lang" icon="file-code" href="/bru-lang/overview">
    The original plain-text markup language behind `.bru` files — syntax, tag
    reference, and samples.
  </Card>
</CardGroup>