Paste YAML to normalize it with clean, consistent indentation — and catch syntax errors instantly with line numbers.
Everything runs in your browser — your YAML is never uploaded.
The formatter parses your document and re-prints it with consistent 2-space (or 4-space) indentation, normalized quoting and clean list spacing. That removes the accumulated quirks of files edited by many hands — mixed tabs, odd spacing, drifting styles.
Because YAML is parsed rather than regex-edited, formatting is semantics-preserving: the output loads to exactly the same data. If anything fails — bad indentation, a duplicate key, an unterminated quote — you get the parser error with the line number, which makes fixing CI configs, Docker Compose files and Kubernetes manifests much faster.
Limitations: YAML anchors and multi-document streams ("---" separators) are parsed, but formatting focuses on single-document files.
Parsing and formatting happen locally in your browser. Your YAML is never sent to any server and never stored.
Paste your YAML, pick 2 or 4 spaces, click Format. The document is re-printed with consistent indentation that you can copy with one click.
Paste it and click Validate (or Format). If the syntax is broken, you'll see the exact parser message including the line number — the #1 way to fix failing pipelines and configs.
Unlike JSON, YAML uses indentation to define structure. One wrong space can change meaning or break the file entirely. The formatter normalizes everything to your chosen style.
No. The file is parsed and re-printed — the data it loads to is identical. Only the presentation (spacing, quoting) is normalized.
Yes — use our JSON ⇄ YAML Converter for two-way conversion. This page focuses on formatting and validation.
Yes. Everything runs client-side, so configs with tokens or internal hostnames never leave your browser.