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TOOL · 96 · Data & Utility

YAML Formatter & Validator

Parse, validate and re-dump YAML with clean 2-space indentation — pinpoints syntax errors as you type.

In short
YAML Formatter parses your YAML with a real parser (js-yaml), validates it, and re-dumps it with clean 2-space indentation. Syntax errors surface the exact line as you type.

Processed 100% in your browser — your files never leave your device.

How it works

  1. Step · 01

    Paste YAML on the left — even sloppy indentation is fine.

  2. Step · 02

    The formatter parses, validates and re-dumps it with clean 2-space indentation.

  3. Step · 03

    Syntax errors surface with the exact line — copy or download the formatted output.

Frequently asked questions

Which YAML version?
YAML 1.2 via js-yaml. Handles anchors, aliases, block and flow styles.
Does it preserve comments?
No — YAML parsers throw away comments during load. If you need comment-preserving reformatting, use an editor plugin instead.
Are my files uploaded to a server?
No. Files are processed directly in your browser using JavaScript and WebAssembly. Nothing is uploaded to our servers, so your documents never leave your device.
Does it work on mobile?
Yes. The tools run in any modern browser on desktop, tablet, or mobile (Chrome, Edge, Safari, Firefox). Very large files may be slower on low-end phones.

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