Format, Validate & Beautify YAML | Free Online
Powerful YAML formatter to format, validate, and beautify your YAML data. This YAML formatter supports syntax highlighting, pretty printing, minification, and real-time validation. Upload YAML files or paste YAML text—the YAML formatter runs instantly in your browser.
Key Features
This YAML formatter bundles the safeguards ops teams ask for—secure workflows, smart validation, and clean output.
Schema-aware formatting
Let the YAML formatter beautify files while preserving anchors, aliases, comments, and multi-document separators.
One-click minify
Use the YAML formatter to collapse verbose manifests into compact strings for config maps or env variables.
Real-time validation
Structured error reporting pinpoints indentation, tab/space, and schema issues with precise line and column context.
Secure file workflow
Upload, edit, and download YAML entirely in your browser—this YAML formatter never sends secrets anywhere.
Auto formatting toggle
Keep formatting tidy as you type with Monaco-powered auto-prettify, or disable it when editing raw manifests.
Undo-friendly editor
Full undo/redo history lets you explore transformations without losing previous revisions.
How It Works
See how the YAML formatter turns messy configs into production-ready manifests.
Paste or upload any YAML document, including multi-doc Helm values or Kubernetes manifests.
Choose Format for clean indentation or Minify for compact strings—auto-prettify can keep things neat as you type.
Built-in validation surfaces YAML syntax issues instantly with structured, multi-line errors from the YAML formatter.
Download the result, copy it, or keep iterating directly in the Monaco editor with undo support.
What YAML Formatter Users Say
"The YAML formatter finally makes our Helm values readable. The inline error panel catches spacing mistakes before they hit CI."
"Being able to minify, validate, and download manifests without installing a CLI has simplified onboarding for new SREs."
"Client-side processing means I can paste kubeconfigs with confidence. The structured stack traces are invaluable during audits."
YAML Formatter FAQ
Does formatting change YAML ordering?
No. The YAML formatter adjusts indentation and whitespace but keeps key order, anchors, aliases, and comments intact.
Can it handle multi-document YAML streams?
Yes. Document separators (---) are preserved and each document is formatted independently.
Is my YAML uploaded to a server?
Everything runs in your browser. Neither files nor snippets are transmitted, so secrets stay secure.
Which YAML versions are supported?
We leverage js-yaml with YAML 1.2 compatibility, making the YAML formatter safe for Kubernetes, Ansible, and modern tooling.
Can I undo accidental edits?
Absolutely. Use the toolbar’s Undo command or keyboard shortcuts (Ctrl+Z / ⌘Z) to revert any change inside the YAML formatter.