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YAMLlint vs Config File Validator: catalog facts
YAMLlint	Config File Validator
Free Free to use in the browser.	Free Free and open source under the Apache 2.0 licence.
Web	Windows, macOS, Linux, Command line
Paste-and-check workflow with no setup Returns a cleaned UTF-8 version of valid YAML	Validates 18 formats with one command Schema validation with automatic SchemaStore lookup
Reformatting strips comments No schema or style rules, only syntax checking	Automatic fixes cover only some problems Formatting checks apply to a subset of the supported formats
Web application	Downloadable app
Closed source	Open source
License not stated	License: Apache-2.0
No account needed	No account needed
Needs internet	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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