Convert Properties to YAML Online
Migrating a Spring Boot or Java app from application.properties to application.yml? This converter rebuilds the hierarchy from your dotted keys, so spring.datasource.url and spring.datasource.username collapse back into a nested spring.datasource object. Comments are preserved where possible. Output is YAML 1.2, ready to drop into application.yml or any modern YAML-first stack.
YAML Converter - Convert Between Formats10 formats
Free YAML converter online. Convert YAML to JSON, XML, TOML, INI, Properties, CSV, and more. Also convert INI to YAML, TOML to YAML, and Properties to YAML. With automatic format detection.
Input (Properties)
Output (YAML)
Result will appear here
When you'd convert Properties to YAML
Real-world scenarios where this conversion is the right move.
Spring Boot upgrade
Modern Spring Boot projects standardize on application.yml. Migrate large .properties files without rewriting by hand.
Helm chart values
Drop legacy Java app properties into a Helm chart values.yaml so the template renders configuration from a structured source.
Documentation and review
Nested YAML is far easier to review in pull requests than a long list of dotted keys. Convert for clarity.
Properties vs YAML — what changes
Quick reference for the structural differences between both formats.
| Aspect | Properties | YAML |
|---|---|---|
| Structure | Flat, dotted keys. | Nested, indentation-based hierarchy. |
| Types | Strings only. | YAML can express numbers, booleans, null and dates explicitly. |
| Lists | Comma-separated or indexed keys. | YAML sequences with - dashes. |
| Diff-friendliness | Each change is one line — easy diffs. | Block-level changes can move several lines — harder for line diffs. |
Frequently asked questions
Does it handle indexed list keys?
Yes. Keys like servers[0].host and servers[1].host rebuild into a YAML sequence of server objects.
What about multi-line values?
Properties files use \ for line continuation. The converter joins them and emits a single YAML value.
Are placeholders like ${...} preserved?
Yes — environment placeholders and SpEL expressions pass through unchanged so Spring resolves them at runtime.
Is the output safe to commit?
Yes. The conversion is deterministic and produces stable YAML output, which means clean diffs across runs.
Other conversions
Hop into another conversion that shares one of these formats.