What happens when you run this tool
Highlight YAML syntax for readability with optional editor aids.
The main value here is precision. You can inspect the transformation before the content goes into code, documentation, a spreadsheet, or another parser.
What formatting actually changes
Highlight YAML rewrites the same content into a layout that is easier to read. The important point is that prettifying should change presentation, indentation, and spacing, not the meaning of the data itself.
YAML is indentation-sensitive, so a spacing change can alter structure rather than just formatting.
This tool is deterministic: the same input and the same settings produce the same output every time. All processing happens in your browser, so your input stays on your device during the transformation.
Practical situations where it helps
Reviewing YAML configs.
Debugging YAML formatting.
Learning YAML syntax.
Examples
Quick before and after
Input
Highlight YAML input:
Email: john.doe@example.com
Status: active
Output
Highlight YAML output:
Email: john.doe@example.com
Status: active
Compact input turned readable
Input
{"a":1,"b":2}
Output
{
"a": 1,
"b": 2
}
What to check before blaming the output
Formatting and minifying tools should not change the logical meaning of the data. If the meaning appears different, it is usually because the original input was already malformed or relied on layout-sensitive syntax.
For deterministic tools, the same input and the same settings should reproduce the same result. If not, the input likely changed in a small but meaningful way.