What is a YAML formatter?
A YAML formatter parses YAML, validates syntax, and rewrites it with consistent indentation so configuration files are easier to read and safer to edit.
Free Tool
YAML Formatter
A YAML formatter is a free tool that validates YAML syntax and rewrites configuration files with consistent indentation, predictable wrapping, and copy-ready output.
Paste YAML from app config, CI workflows, Kubernetes manifests, OpenAPI snippets, or frontmatter, then format it without sending your data to a server.
Input
YAML source
Format options
Output
Formatted YAML
name: Code Card
version: 1.0.0
features:
- AI coding stats
- shareable profiles
- achievement badges
deploy:
provider: kubernetes
health_checks:
- /api/health
- /tools
Lines
11
Keys
6
Size
186 B
Common fixes
Replaces inconsistent sequence indentation with valid spacing.
Surfaces duplicate keys and parser errors before copy or download.
Keeps formatting private in the browser with no server upload.
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FAQ
YAML formatter questions
Does this YAML formatter upload my files?
No. Formatting runs in your browser, so pasted YAML stays on your device and is not sent to Code Card.
Can this tool validate YAML syntax?
Yes. The formatter uses a YAML parser to surface syntax errors, duplicate key issues, and parser warnings before you copy or download the result.
Should YAML use 2 spaces or 4 spaces?
Most YAML config files use 2 spaces because it keeps nested structures compact. This formatter also supports 4 spaces when your project convention requires it.
Can I sort YAML keys alphabetically?
Yes. Enable sort keys to alphabetize mappings, which can make environment, CI, and app config files easier to scan.