YAML Formatter
Beautify or minify YAML instantly. Format messy YAML into readable, indented output.
What is YAML Formatting?
YAML (YAML Ain't Markup Language) is a human-readable data format built entirely around indentation — unlike JSON, there are no braces or brackets to mark structure, just whitespace. That makes clean YAML pleasant to read, but it also means inconsistent indentation, mixed tabs and spaces, or misaligned list items can silently change the meaning of a file or break parsing altogether.
A YAML formatter (also called a YAML beautifier) fixes this by re-indenting a document into clean, consistent block style without changing the underlying data. Formatting only affects layout — keys, values, and structure remain exactly the same before and after. This is especially valuable for YAML used in Kubernetes manifests, Docker Compose files, CI/CD pipelines (GitHub Actions, GitLab CI), and Ansible playbooks, where a single misplaced space can cause a deploy or pipeline run to fail.
The opposite operation, minifying, converts block-style YAML into compact flow style using {} and []— useful when YAML is generated programmatically or embedded where readability doesn't matter but size does.
This page lets you format YAML online for free, directly in your browser. Paste any YAML — a Kubernetes manifest, a Compose file, a CI config, or an Ansible playbook — and it's instantly beautified, minified, and validated, all without installing anything or sending your data anywhere.
Why Format YAML?
Kubernetes Manifests
Deployment, Service, and ConfigMap YAML is unforgiving about indentation. A formatter re-indents it consistently so kubectl apply doesn’t choke on a stray space.
Docker Compose
Compose files grow quickly with services, volumes, and networks. Consistent formatting keeps a multi-service docker-compose.yml easy to scan and edit.
CI/CD Pipelines
GitHub Actions, GitLab CI, and CircleCI configs are all YAML. Clean indentation makes nested steps and job dependencies easy to follow at a glance.
Ansible Playbooks
Playbooks and role files rely on strict indentation to define task order and structure. Formatting catches misalignment before a playbook run fails.
Example
Here's the same YAML document before and after formatting with 2-space indentation.
server:
host: localhost
port: 3000
debug: true
database:
host: db.local
name: myapp_dev
tags:
- primary
- cacheserver:
host: localhost
port: 3000
debug: true
database:
host: db.local
name: myapp_dev
tags:
- primary
- cacheFeatures
Format
Beautify messy or inconsistently indented YAML into clean, readable block style.
Minify
Convert YAML into compact flow style using {} and [] to shrink it for storage or transfer.
Copy
Copy the formatted or minified output to your clipboard with a single click.
Download
Save the result as a standalone .yaml file for use in your project or pipeline.