Normalise the indentation of a YAML document and catch obvious structural problems. The formatter is self-contained, uses no external library, and runs entirely in your browser. 100% Local
How to Use the YAML Formatter
Paste YAML and press Format. Nested blocks are re-indented consistently and tabs are handled; a line that clearly cannot be YAML produces an error instead.
Scope
Indentation is normalised from the document’s own nesting.
Comments are preserved.
It is a line-based formatter, not a full YAML parser.
Features
Consistent indentation for nested blocks
Basic structural validation
No external YAML library at all
All processing runs locally in your browser. Your YAML is not uploaded to any server.
Always validate critical YAML with your real toolchain before deploying it.