Textoolz

YAML Formatter & Validator

Format, beautify, and validate YAML data online. Free YAML formatter with configurable indentation that catches syntax errors instantly.

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The YAML Formatter & Validator parses your YAML data and re-formats it with clean, consistent indentation. Paste messy or inconsistently indented YAML and get a well-structured document with your preferred indent size.

This tool also validates your YAML — if the input has syntax errors such as incorrect indentation, invalid mappings, or duplicate keys, you'll see a descriptive error message. It's ideal for editing Kubernetes manifests, Docker Compose files, CI/CD configurations, and other YAML-based config files.

All processing runs entirely in your browser. Your YAML data is never sent to any server, keeping configuration secrets and infrastructure details private.

How to Use YAML Formatter & Validator

  1. 1Paste your YAML data into the input area above.
  2. 2Select your preferred indent size and flow level.
  3. 3The formatted YAML appears instantly in the output area.
  4. 4Click the Copy button to copy the clean YAML to your clipboard.

Frequently Asked Questions

What does the YAML formatter do?▾
The YAML formatter parses your YAML input and outputs it with consistent indentation and structure. It normalizes spacing, aligns keys, and ensures your YAML follows a clean, readable format.
Can this tool validate YAML?▾
Yes. If your YAML has syntax errors like incorrect indentation, invalid characters, or malformed structures, the tool displays a descriptive error message indicating what went wrong.
What is flow level?▾
Flow level controls when the formatter switches from block style (multi-line) to flow style (inline, using {} and []). The default (-1) uses block style throughout. Higher values inline deeper nested structures.
Is my YAML data secure?▾
Yes. All formatting and validation happens in your browser. Your YAML data is never sent to any server, making it safe for configuration files containing secrets or infrastructure details.