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YAML Formatter and Validator

Validate and normalize supported data-only YAML locally.

Your data is processed locally in your browser and is never uploaded.Maximum: 4 MB per file. Input is not saved in browser storage or placed in the URL.
Output

How to use this tool

  1. Load a YAML mapping, format it, and review any line-specific diagnostic.
  2. Review the live result and use Copy result when you need to share it.

How the transformation works

This first release deliberately supports common mappings, sequences and scalar values only. Processing runs entirely in this browser. The page does not upload, persist, execute or remotely inspect the supplied content.

Processing rules

This first release deliberately supports common mappings, sequences and scalar values only. Processing runs entirely in this browser. The page does not upload, persist, execute or remotely inspect the supplied content.

Step-by-step transformation

  1. Load a YAML mapping, format it, and review any line-specific diagnostic.
  2. This first release deliberately supports common mappings, sequences and scalar values only. Processing runs entirely in this browser. The page does not upload, persist, execute or remotely inspect the supplied content.
  3. Check the displayed result, then copy it if needed.

Worked example

A project mapping is normalized to consistent two-space indentation.

Risk guidance

Frequently asked questions

Does this tool send my inputs anywhere?

No. The interactive calculation runs in your browser and this site does not submit tool inputs to a backend.

How should I use the result?

Check that the entered units and values match your situation, especially around dates, breaks, and rounding.

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