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Config File ValidatorYAMLlint
Free

Free and open source under the Apache 2.0 licence.

 Free

Free to use in the browser.

Windows, macOS, Linux, Command line Web
  • Validates 18 formats with one command
  • Schema validation with automatic SchemaStore lookup
  • Paste-and-check workflow with no setup
  • Returns a cleaned UTF-8 version of valid YAML
  • Automatic fixes cover only some problems
  • Formatting checks apply to a subset of the supported formats
  • Reformatting strips comments
  • No schema or style rules, only syntax checking
Downloadable app Web application
Open source Closed source
License: Apache-2.0 License not stated
No account needed No account needed
Works offline Needs internet

Checked October 2, 2026

Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.