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YAML Formatter & Validator

Format and validate YAML — catch the indentation mistakes that break CI pipelines.

To format YAML, paste your document and it is parsed and reprinted with consistent indentation and spacing. Because it parses first, an invalid document fails with the location of the error rather than being silently reindented into something different.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Why does YAML break so easily?

Indentation is structural and tabs are forbidden entirely. A single misaligned space changes which parent a key belongs to, which is why a CI file can parse successfully yet do something completely different from what you intended.

How to use the yaml formatter & validator

  1. 1Enter or paste your yaml.
  2. 2Set the line width.
  3. 3Set the indent size.
  4. 4Turn "Indent with tabs" on or off as needed.
  5. 5The result appears immediately — copy or download it.

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