Does this validate my YAML?

Yes, invalid YAML shows a clear parsing error instead of silently producing wrong output.

What indentation does it use?

Output is normalized to 2-space indentation regardless of the input's spacing.

Are comments preserved?

No, comments are stripped during parsing since this focuses on structural reformatting.

Can it handle nested lists and maps?

Yes, arbitrary nesting of maps and lists is supported.

Is my data uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your input never leaves your device and nothing is logged or stored on our servers.

YAML Formatter

Beautify and normalize YAML with a hand-written parser.

Support

Works Offline

Privacy First

No Login

No API

YAML input

Beautified YAML

YAML

name: Ada
skills:
  - logic
  - math
address:
  city: London
  zip: "90210"

About the YAML Formatter

Paste messy or inconsistently indented YAML and get a cleanly re-serialized version with normalized 2-space indentation, consistent quoting, and preserved nested maps and lists — all parsed locally with a hand-written YAML parser.

Examples

Messy indentation

YAMLname: Ada
skills:
    - logic

Output

YAMLname: Ada
skills:
  - logic

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

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Version 1.0.0 · Updated 2026-08-11 · Runs entirely in your browser