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Format Conversion

YAML Formatter

· Last updated：2026-06-21

Format and beautify YAML. Note: comments are lost (js-yaml limitation)

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Written by the Elysia Tools team
Conversion369
Format Conversion142
YAML9
Pretty Print5

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Format Conversion
Input types
textarea, number, select
Output type
text
Sample coverage
4
API ready
Yes

Overview

The YAML Formatter is a utility tool designed to clean, structure, and minify YAML data. It allows you to adjust indentation sizes and toggle between beautifying and minifying modes to ensure your configuration files are syntactically correct and easy to read.

When to use

  • When you need to fix indentation errors or clean up messy YAML configuration files.
  • When you want to compress YAML data into a minified format to reduce payload size.
  • When you need to standardize the indentation size across different YAML documents.

How it works

  1. 1Paste your raw YAML data into the input text area.
  2. 2Select your preferred formatting mode (Beautify or Minify) and set the indentation size.
  3. 3The tool parses the YAML input and outputs the formatted or minified result instantly.

Use cases

  • Formatting Kubernetes deployment manifests for better readability.
  • Minifying CI/CD pipeline configurations to save space.
  • Standardizing indentation in application configuration files.

Examples

1. Beautifying a Kubernetes Manifest

DevOps Engineer

Background

A DevOps engineer has a messy Kubernetes deployment YAML file with inconsistent spacing that causes deployment errors.

Problem

The manifest has mixed 2-space and 4-space indentations, making it hard to debug.

How to use

Paste the messy YAML into the input, set the Indent Size to 2, select Beautify mode, and copy the formatted output.

Indent Size: 2, Mode: Beautify

Outcome

The Kubernetes manifest is perfectly aligned with consistent 2-space indentation, resolving syntax issues.

2. Minifying a Docker Compose Configuration

Software Developer

Background

A developer wants to compress a Docker Compose file to embed it as a compact payload in an API request.

Problem

The YAML file contains unnecessary whitespace and line breaks.

How to use

Paste the Docker Compose YAML, select Minify mode, and run the formatter.

FAQ

Will my comments be preserved after formatting?

No, comments are lost during formatting due to parser limitations.

What indentation sizes are supported?

You can set the indentation size anywhere from 0 to 8 spaces.

Can I minify my YAML files?

Yes, you can switch the mode option to Minify to compress your YAML data.

Does this tool validate YAML syntax?

Yes, it parses the input, which helps identify syntax errors in your YAML structure.

Is there a file size limit for formatting?

The tool runs in your browser and can handle standard configuration files efficiently.

Hub

Code Minify, Beautify, and Format Tools

Prepare code and markup for review or delivery with readable formatting, compact output, and preservation checks.

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Data Formats

YAML Samples

YAML (YAML Ain't Markup Language) format examples from simple to complex structures

Development

YAML Viewer Samples

Sample YAML files (app config, docker-compose, k8s) for the in-browser YAML Viewer

Container Orchestration

Kubernetes YAML Samples

Complete Kubernetes YAML manifests for Deployment, Service, ConfigMap, Secret, Ingress and other essential resources

Observability

Distributed Tracing Samples

Comprehensive distributed tracing examples using Jaeger, OpenTelemetry, and other modern observability tools for microservices architecture

Format Conversion

JSON Formatter

Format and validate JSON data

Format Conversion

TOML Formatter

Format and beautify TOML. Note: comments are lost and key order may change (@iarna/toml limitation)

Format Conversion

XML Formatter

Format, beautify and minify XML with configurable indent. Preserves comments and CDATA

Format Conversion

TOML / INI / HCL / .env / Nix / dotenv ⇄ Kubernetes ConfigMap & Secret Config Format Bridge

Convert configuration files between dotenv .env, TOML, INI, Java .properties, YAML, JSON, HCL (Terraform/Vagrant native syntax) and Nix attribute sets, and emit Kubernetes ConfigMap or Secret manifests. Template placeholders (${VAR}, {{var}}, envsubst) are preserved verbatim, type inference provenance (string/int/float/bool/list) is tracked, HCL block labels fold into nested keys, and a round-trip diff calls out non-equivalent settings — dropped keys, re-typed values and rewrites — instead of coercing them silently.

Mode: Minify

Outcome

The YAML is compressed into a compact, minimal-space format suitable for API payloads.