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  3. /YAML Formatter

YAML Formatter

Parse YAML and re-output it with consistent indentation, parsed safely.

SIMILAR DEVELOPER

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Base64 Encoder/Decoder

Fast conversion between string and base64 encodings

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JSON Tree Viewer

Inspect nested JSON structures and fix syntax errors

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JWT Encoder/Decoder

Decode a JWT to read its header, payload and expiry status. Decoding only: signatures are not verified.

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WHAT IS YAML FORMATTER?

Parse YAML and re-output it with consistent indentation. It is parsed safely, never executing custom tags.

How to use?

  1. Paste or upload your YAML.
  2. Choose the indent width (2 or 4 spaces).
  3. Click Format, then copy the result.

Frequently asked questions

Does formatting preserve the original comments?

No — normalizing YAML means parsing it into data and re-emitting that data, and comments aren't part of the data model to begin with, so they aren't preserved. This is a limitation shared by virtually every YAML library, not something this tool intentionally strips.

Will a custom YAML tag get executed?

No — parsing uses a safe schema with no code-executing tag support. An unrecognized tag is reported as an error, never silently executed.

Why is there no tab-indent option?

The YAML specification explicitly forbids tab characters in indentation, so only 2-space and 4-space options are offered, to avoid producing invalid YAML.

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Formatting runs entirely in your browser — the source you paste or upload here is never sent to any server.