// YAML

YAML tools for developers.

Format, validate, convert, and inspect YAML without leaving your browser. Every tool below processes your data locally — nothing is uploaded.

Format & validate

Pretty-print, normalize, and check YAML syntax with line-aware errors.

YAML FormatterPrettify, indent, and normalize YAML.formatters YAML ValidatorCheck YAML syntax and surface precise error locations.validators JSON FormatterPretty-print JSON with customisable indentation.formatters JSON ValidatorCheck JSON syntax and pinpoint errors.validators JSON MinifierCompress JSON by stripping whitespace.formatters

Convert

Move between YAML and JSON, or transform YAML into other data formats.

YAML to JSONConvert YAML to JSON in your browser with line-aware errors.yaml JSON to YAMLConvert JSON into clean, human-readable YAML.yaml YAML DiffCompare two YAML documents and highlight differences.yaml YAML StatisticsCount keys, depth, arrays, and types in a YAML document.yaml YAML Key SorterSort keys alphabetically in a YAML map.formatters YAML FlattenerFlatten nested YAML into dotted-key form (or back).converters YAML Quote Style ConverterSwitch between single, double, and unquoted strings.formatters CSV to YAMLConvert CSV to a list of YAML mappings.converters YAML to CSVConvert a YAML list of maps into CSV.converters TSV to YAMLConvert tab-separated values into YAML mappings.converters YAML to TSVConvert a YAML list of maps into TSV.converters XML to YAMLConvert XML into YAML.converters YAML to XMLConvert YAML into an XML document.converters TOML to YAMLConvert TOML configuration into YAML.converters YAML to TOMLConvert a YAML map to TOML configuration.converters Properties to YAMLConvert Java .properties files to YAML.converters YAML to PropertiesConvert a YAML map into Java .properties format.converters

// About YAML

What is YAML?

YAML ("YAML Ain't Markup Language") is a human-readable data serialization format commonly used for configuration files, CI pipelines, and Kubernetes manifests. It uses indentation to express structure and supports maps, sequences, scalars, and anchors.

Because YAML is whitespace-sensitive, even a single missing space can break a document. The tools above help you fix that without leaving your editor.