YAML Formatter
Format and validate YAML configuration to check indentation and syntax errors.
FreeBrowserAbout YAML Formatter
Read and reformat YAML configuration while checking for parsing errors. Use the cleaned output to review indentation and structure before editing a deployment or application configuration.
When to use this tool
- Make an inline YAML mapping easier to read.
- Check a configuration after changing indentation.
Limits to know before using it
Parsing and serialization can change presentation details such as quoting or comments. Valid YAML does not mean the configuration matches a specific application schema.
Data handling and cost
The main operation runs in your browser; tool input is not uploaded for processing. The site can still use session cookies and collect operational or usage data as described in the privacy policy.
Free to use in your browser, with no sign-in needed.
Frequently Asked Questions
No. Formatting and validation run entirely in your browser. Your data is never sent to any server.
It normalizes indentation to 2 spaces, removes trailing whitespace, and ensures consistent quoting. The semantic content of the YAML is preserved.
Common causes include inconsistent indentation (mixing tabs and spaces), duplicate keys, or special characters in unquoted strings. The error message shows the line number to help you locate the issue.