YAML Formatter Online
Paste YAML, then format it with clean indentation or validate it — entirely in your browser.
Paste your YAML
Valid YAML ✓
Result
Never uploaded
Formatting happens entirely in your browser — your YAML never touches our servers.
Instant
No waiting, no upload progress bar — results appear the moment you click.
Free, no limit
No account, and no limit on how many times you can use it.
What is a YAML Formatter?
A YAML formatter re-parses your YAML and re-outputs it with clean, consistent indentation — useful for standardizing a config file, cleaning up YAML that was hand-edited inconsistently, or checking that a file (like a Docker Compose or GitHub Actions config) is valid before you use it.
How to Format YAML Online
- Paste or upload your YAML. Paste directly into the editor, or click "Upload a file" to load a .yaml/.yml file's contents.
- Choose a mode. Format for clean, consistent indentation, or Validate to check correctness.
- Click the action button. The result appears below — including the exact line and column if your YAML is invalid.
- Copy or download. Copy the result to your clipboard, or download it as a .yaml file.
Frequently Asked Questions
What is a YAML formatter?
A tool that re-parses and re-outputs YAML with clean, consistent indentation.
Can I validate YAML online?
Yes. Switch to Validate mode and paste your YAML — invalid YAML shows the parser's error, including line and column.
Is my YAML data uploaded anywhere?
No. This tool runs entirely in your browser — your data is never sent to CurePDF's servers.
Is the YAML formatter free?
Yes, with no account required and no limit on how many times you can use it.