YAML Formatter
Format and validate YAML online for configs, CI files, front matter, and Kubernetes-style snippets with browser-local processing.
Paste YAML to normalize indentation, expand compact lists, and catch parser errors before copying a config snippet. The formatter runs in your browser, uses a YAML 1.2 parser, and does not execute YAML tags or code.
Browser-local processing
YAML Formatter
How to use
Finish in three steps
- 01
Paste a YAML config, CI snippet, front matter block, or Kubernetes-style example into the input box.
- 02
Click "Format YAML" to normalize indentation, or "Validate YAML" to confirm that the parser accepts the document.
- 03
Review anchors, aliases, comments, secrets, and the target system schema before copying the result.
What the YAML Formatter checks
The tool parses YAML 1.2 locally, reports syntax errors, enforces unique mapping keys, and prints the document with two-space indentation. It catches common indentation, colon, quote, list marker, and bracket mistakes.
What it does not validate
The tool does not know whether a Docker Compose, GitHub Actions, Kubernetes, OpenAPI, or static-site config uses the right fields. It also does not check permissions, credentials, runtime behavior, or deployment safety.
Safe handling boundaries
YAML tags are parsed as data and no code is executed by the formatter. Browser-local processing avoids sending input to an API, but you should still avoid pasting production secrets or confidential customer data into pages you do not trust.
FAQ
About this tool
Does this tool execute YAML tags or custom constructors?
No. The formatter parses YAML as data for formatting and validation. It does not run code, call services, or apply application-specific constructors.
Can it validate Kubernetes, Docker Compose, or GitHub Actions schemas?
No. It checks YAML syntax and prints normalized YAML. Platform schemas, allowed keys, permissions, and deployment behavior must be checked by the target toolchain.
Will formatting change my YAML?
Formatting may expand flow-style arrays or objects and normalize indentation. Review anchors, aliases, comments, ordering expectations, and whitespace-sensitive strings before using the result.
Does YAML Formatter upload my input?
No. Formatting and validation run in the browser. Avoid pasting secrets, tokens, private keys, or private infrastructure data into any tool page you do not trust.
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