What does a YAML formatter do?
It applies consistent indentation and spacing to make YAML configuration files easier to read and maintain.
YAML Formatter & Editor
Format, edit, validate and view YAML online while preserving comments, anchors and aliases. Free browser-based YAML editor with no sign-up.
About the YAML Formatter & Editor
Format, edit and validate YAML configuration files with comment-aware parsing and clear syntax feedback. Anchors, aliases and YAML-specific structure remain intact because documents are not converted to JSON. Processing stays in your browser.
- Comment-preserving YAML formatting
- Anchors and aliases
- Line-aware YAML validation
- YAML document model
How to use the YAML Formatter & Editor
- Paste YAML or upload a .yaml or .yml file.
- Select an indentation size, then choose Format or Validate.
- Review the result before copying or downloading the YAML document.
Frequently Asked Questions
Can I validate YAML syntax online?
Yes. Validate checks the document and reports useful line information for syntax errors when available.
Are YAML comments preserved?
Yes. Formatting uses the YAML document model rather than converting the document to JSON.
Does the editor resolve YAML aliases?
No. Anchors and aliases remain YAML syntax and are not flattened.
Is my YAML uploaded?
No. Editing, validation and formatting happen locally in your browser.