Is my YAML uploaded anywhere?

No. The formatter is plain JavaScript that runs entirely in your browser. Your YAML is never sent to a server.

How accurate is the re-indentation?

The tool detects your source indentation step, snaps every line to a consistent normalised level, expands tabs to spaces (YAML disallows tab indentation) and tidies the spacing after a key colon and after list dashes. Block scalars (| and >) are preserved verbatim. It re-indents rather than fully parsing the document, so it does not detect every structural error.

Will it change my data?

No. Only indentation and the spacing around colons and list dashes are normalised. Keys, values and block-scalar contents are kept as written.

YAML Formatter & Re-indenter

YAML formatter and re-indenter

Paste YAML with inconsistent indentation, stray tabs or untidy spacing and get back a normalised document. The tool detects your source indentation step, snaps every nesting level to a consistent indent, expands tabs to spaces (which YAML forbids for indentation) and tidies the spacing after key: and - list items. Block scalars introduced by | or > are left untouched so their formatting is preserved.

It is privacy-first: everything runs in your browser as plain JavaScript, so your YAML never leaves your device.