Is my YAML data uploaded to a server?

No. Everything runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.

How are lists represented?

With indexed keys following the Spring convention: server.ports[0]=8001, server.ports[1]=8002. Special characters in keys and values are escaped.

100% local — your data never leaves your browser

YAML to Properties Converter — Free Online Tool

Flatten YAML mappings into Java .properties keys instantly in your browser. Free and private: your data never leaves your device.

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Swap: Properties → YAML

YAML input

Properties output

Why convert YAML to .properties?

Some deployment targets and older Java tooling only read .properties files. Paste a YAML mapping above and get flattened dotted keys, ready for Spring Boot or any java.util.Properties consumer.

How it works

The converter parses your YAML locally (anchors and merge keys resolved) and walks the tree, joining nested keys with dots and indexing lists as key[i]. Backslashes, separators and newlines are escaped so the output parses back identically.

Frequently asked questions

Is my YAML data uploaded to a server?: No. Everything runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.
How are lists represented?: With indexed keys following the Spring convention: server.ports[0]=8001, server.ports[1]=8002. Special characters in keys and values are escaped.