Free YAML Beautifier Online – Format & Prettify YAML
Paste messy or minified YAML and instantly get clean, properly indented output with syntax highlighting. No signup needed.
YAML Input
Beautified Output
What Is a YAML Beautifier?
A beautifier goes a step further than a plain formatter. While a formatter just makes YAML valid, a beautifier focuses on readability — normalizing indentation to 2 consistent spaces, stripping extra whitespace after colons, and optionally sorting keys alphabetically so every config file looks like it was written by the same person. If you've ever pulled a Kubernetes manifest from a CI pipeline and found tabs mixed with spaces, or worked on a project where 3-space indentation got committed by accident, you know the pain. This tool fixes all of that in one shot. It uses the YAML 1.2 spec-compliant js-yaml library to parse your input and re-emit it in pristine, consistent form — right in your browser with no data sent anywhere.
The difference from a basic formatter: a beautifier also normalizes value spacing (removes extra spaces after colons), handles multiline strings correctly, and can sort keys to make diffs cleaner. Runs entirely in your browser. Safe to use with Docker Compose files, secrets, or any production config — nothing leaves your machine.
How to Use the YAML Beautifier
Paste or Upload Your YAML
Paste your YAML into the left editor — works with any YAML: Kubernetes manifests, Docker Compose, GitHub Actions workflows, app configs. Use Upload to load a .yaml or .yml file directly. Sample loads a Kubernetes-style example.
Adjust Options
Pick your preferred indentation (2 or 4 spaces — the YAML spec requires spaces, not tabs). Toggle Sort Keys to alphabetize all mapping keys — great for keeping configs consistent across environments and making git diff output cleaner.
Copy or Download
Click Copy to paste the result back into your editor, or Download to save as .yaml. Need JSON instead? Use YAML to JSON. Need to shrink the file? Try the YAML Minifier.
YAML Beautifier Examples
Before and after: what the beautifier does to real-world messy YAML.
Example 1: App config with inconsistent indentation
Beautified output:
Example 2: Kubernetes Deployment with mixed spacing
Beautified output:
Click Sample above to load a realistic Kubernetes-style config and see beautification in action.
Frequently Asked Questions
What's the difference between a YAML beautifier and a YAML formatter?
A formatter makes YAML valid and properly indented. A beautifier does that plus normalizes extra spaces after colons, removes trailing whitespace on each line, and optionally sorts keys for maximum consistency. Think of formatting as "make it work" and beautifying as "make it look great and stay consistent."
Does it change any of my values?
No. The tool parses your YAML into a data structure and re-emits it — the semantic content stays identical. Strings, numbers, booleans, and lists come out exactly as they went in. Only the whitespace and key order (if Sort Keys is on) are affected.
Can I use this for Kubernetes YAML files?
Yes, that's one of the primary use cases. Kubernetes configs can get messy when edited by multiple people or generated by tools. Paste the manifest in, click beautify, and you'll get clean 2-space-indented output ready to commit.
Why does YAML care so much about indentation?
Unlike JSON which uses braces, YAML uses indentation to define structure. A single extra space can change a child key into a sibling, or break parsing entirely. The spec also forbids tabs — only spaces are valid. That's why consistent beautification matters.
Does it work with multi-document YAML (multiple --- separators)?
The tool handles standard single-document YAML well. Multi-document YAML (files with multiple --- separators) may be processed as a single document — if you need to process each document separately, split them first.
Is my data safe? Does it get sent to a server?
Everything runs in your browser using JavaScript. No data is transmitted to any server. You can safely paste API keys, database passwords, or any sensitive config — it never leaves your machine. Check the MDN Web Docs if you want to understand how browser-side JavaScript works.
What if my YAML has errors?
The tool will show an error message explaining where the problem is. Fix the syntax issue first, then beautify. For deeper diagnosis, use the YAML Validator which gives detailed error messages and line numbers.