YAML Formatter Online — Validate and Prettify YAML
Format YAML online with consistent two-space indentation and validate its syntax locally in your browser.
About this tool
This YAML formatter parses input and serializes the resulting data with two-space indentation. It is useful for readable configuration, but comments and original styling are not preserved.
How to use
- Paste the YAML document.
- Format it to validate and normalize indentation.
- Review data types and copy the result.
Features
- Validates YAML syntax.
- Outputs consistent two-space indentation.
- Runs locally in the browser.
Common use cases
- Clean configuration files.
- Inspect compact YAML.
- Normalize YAML before review.
Common issues and tips
- Tabs or bad indentation can invalidate YAML.
- Comments and original formatting are lost during parsing.
Privacy
YAML formatting runs locally. Input is not uploaded to Tools12345.
Frequently asked questions
Does it validate YAML?
Yes. Invalid YAML cannot be formatted.
Are comments preserved?
No. Parsing keeps data rather than comments and source layout.
What indentation is used?
The output uses two spaces.