Toolono
Developer Tools
View All Developer ToolsDate & Time
View All Date & Time ToolsText Tools
View All Text ToolsOnline Converters
View All Online ConvertersYAML Formatter
Format, validate, and minify YAML online with clear error detection, instant validation feedback, and built-in minify support.
Editor
YAML Input
Paste raw YAML, then format, validate, or minify it before copying the cleaned result back into a config file, manifest, or workflow.
Indent
Output
Formatted Output
Review normalized YAML in a read-only code view before you copy it into a manifest, pipeline file, app config, or deployment setting.
Read-only YAML output
Ready
Status
The status panel keeps validation feedback separate from the output pane so stale output never looks current.
Workspace Summary
Use this summary to confirm payload size, line count, and the current YAML output mode.
How to use YAML Formatter
- Paste raw YAML into the editor pane on the left side of the workspace.
- Choose your preferred indentation, then click Format to generate readable YAML output.
- Use Validate to confirm that the YAML parses successfully before you copy it elsewhere.
- Use Minify when you want compact flow-style YAML output for transport, embeds, or storage.
- Copy or download the final output after the workspace shows a valid result.
YAML formatter examples
-
Format a Kubernetes manifest before reviewing indentation, lists, and nested mappings.
-
Validate copied YAML from a CI pipeline or app config before reusing it in another environment.
-
Minify a YAML payload into compact flow-style output before storing it in a constrained field or test fixture.
What this YAML formatter does
This YAML formatter gives you a focused workspace for beautifying, validating, and minifying YAML in one place. Instead of switching between a text editor, a YAML validator, and a separate formatter, you can keep the raw input, normalized output, and parse feedback visible together.
That makes it useful for configuration files, infrastructure manifests, CI workflow definitions, deployment settings, and copied YAML snippets that need cleanup before you reuse them.
When to format, validate, or minify YAML
Use Format when you want readable indentation and clearer nesting for mappings and lists. Use Validate when you mainly need to confirm that the YAML parses correctly before you continue. Use Minify when you want the smallest possible YAML output in a compact flow style.
All three actions work from the same editor state, so you can move between cleanup, verification, and export without leaving the current workspace.
YAML formatter FAQs
Does this YAML formatter validate YAML too?
Yes. Validate checks whether the current YAML parses successfully and reports an invalid state with readable error details when it fails.
Can I minify YAML with this tool?
Yes. Use Minify to generate compact flow-style YAML output for transport, embedding, or storage.
Why is my YAML invalid?
YAML usually becomes invalid because of indentation problems, malformed mappings or lists, missing closing characters, or values placed where the parser does not expect them. The formatter highlights the failing line when location data is available so you can correct the structure and try again.
What happens when the YAML is invalid?
The workspace shows an invalid state, highlights the failing line when location data is available, and avoids leaving a misleading successful output in place.