YAML Indentation Checker
Check YAML indentation widths and flag tabs or uneven nesting.
What the YAML Indentation Checker does
Check YAML indentation widths and flag tabs or uneven nesting. A line indented by three spaces is flagged when the project expects two-space indentation Adjust the controls and the preview updates immediately, so you can dial in exactly what you want and copy the result straight into your project — no build step and no account.
One thing to keep in mind: This does not validate full YAML syntax; it focuses on indentation mistakes that are easy to miss.
Private and in your browser
Everything runs locally in your browser. Your input is never uploaded, so the tool stays fast and works offline, and the copy and download buttons always use the current result shown in the output panel.
Frequently Asked Questions
What does the YAML Indentation Checker do?
Check YAML indentation widths and flag tabs or uneven nesting. A line indented by three spaces is flagged when the project expects two-space indentation.
What should I keep in mind?
This does not validate full YAML syntax; it focuses on indentation mistakes that are easy to miss
Does it upload my input?
No. The YAML Indentation Checker runs entirely in your browser — your input is never uploaded, and it keeps working offline once the page has loaded.
Practical utilities for front-end design and implementation work.