YAML Beautifier
Normalise messy YAML into clean, consistently indented output — and catch the indentation and tab mistakes that quietly break CI pipelines.
What is a YAML beautifier?
A YAML beautifier parses your YAML and re-emits it with clean, consistent two-space indentation. Because YAML is whitespace-sensitive — indentation literally defines structure — a beautifier doubles as a validator: if your document can't be parsed, it isn't valid YAML, and you'll know right away.
This tool reads your input with a real YAML parser and re-serialises it, so inconsistent spacing, accidental tabs, and ambiguous nesting get normalised into one predictable shape. It's the quickest way to confirm a CI, Docker Compose, or Kubernetes file is structurally sound before you commit it.
Everything is processed locally — your infrastructure config never touches a server.
How to beautify YAML
- 1
Paste your YAML
Add your YAML to the input pane, or upload a .yml / .yaml file.
- 2
Get normalised output
Cleanly indented, consistent YAML appears in the output pane.
- 3
Fix flagged errors
If parsing fails — often due to a tab or a bad indent — the error tells you where to look.
- 4
Copy or download
Copy the tidy result or save it as a .yaml file.
Why it matters for YAML specifically
Whitespace is structure
In YAML, indentation isn't cosmetic — it defines nesting. Normalising it prevents subtle structural bugs.
Catch tabs early
YAML forbids tabs for indentation. The parser flags them before a pipeline fails on push.
Tame config sprawl
Bring inconsistent CI, Compose, or Helm files into one clean, reviewable format.
Keep configs private
Secrets and internal config are parsed locally and never uploaded.
Example: before and after
Inconsistent indentation on the left, normalised output on the right.
services:
web:
image: nginx
ports:
- "80:80"services:
web:
image: nginx
ports:
- "80:80"The YAML mistakes that cost the most time
- Using tabs instead of spaces — YAML rejects tabs for indentation outright.
- Inconsistent indent widths between sibling keys, which silently changes the structure.
- Unquoted values that YAML reads as booleans or numbers (
no,yes,on,1.0). - Missing spaces after colons in
key: valuepairs. - Trailing colons or stray indentation that break the parse.
From YAML to JSON and back
YAML and JSON describe the same kind of data, so they're interchangeable. Beautify your YAML here to confirm it parses, then convert it to JSON when an API or tool expects that format instead. Clean input makes that round-trip predictable.
Frequently asked questions
YAML uses indentation to represent nesting, so the amount of leading whitespace literally changes the data structure. Normalising it to consistent two-space indents removes a whole class of hard-to-spot bugs.
Yes. The document is parsed before it's reformatted, so syntax errors — including tabs used for indentation — are reported instead of producing misleading output.
No. Parsing and formatting happen entirely in your browser, so infrastructure configs and secrets stay on your machine.
The YAML specification disallows tab characters for indentation because their width is ambiguous. Use spaces — this tool normalises everything to two spaces.
No. Keys, values and ordering are preserved. Only indentation and spacing are normalised. Note that the parser may strip comments, since it works on the parsed data structure.
Yes. Once your YAML is clean and valid, you can convert it to JSON with our JSON tools when a system expects JSON instead.
Need another tool?
Browse the full toolbox or dig into the blog for the engineering behind it.