snaptools
Y
YAML Formatter error
⌃⏎ run · ⎋ clear · / focus input
// about this tool

YAML Formatter Online

Updated 2026-07-09

Beautify and re-indent YAML right in your browser. Paste YAML with inconsistent spacing or messy indentation into the editor and SnapTools returns clean, normalized output as you type — with configurable indent width and one-click copy or download. Nothing is uploaded: all formatting happens locally, so it's safe for config files and secrets.

YAML is indentation-sensitive, so a single misaligned line can break a whole file. This tool parses your document first — catching syntax errors immediately — then re-writes it with consistent spacing, so what you get back is guaranteed to parse the same way it did before, just easier to read.

// how to use

  1. 1 Paste or type your YAML into the input panel on the left — formatting starts as you type.
  2. 2 Open Settings to choose an indent width (2–4 spaces).
  3. 3 Read the clean, re-indented YAML on the right; invalid YAML shows an error instead.
  4. 4 Click Copy or Download to take the result with you.

// examples

Inconsistent indentation
Input
name: SnapTools
version:    2
tags:
- json
- free
Output
name: SnapTools
version: 2
tags:
  - json
  - free
Nested mapping
Input
name: SnapTools
owner:
  team: core
  active: true
Output
name: SnapTools
owner:
  team: core
  active: true

// common uses

Cleaning up inconsistent indentation in config files Reviewing Kubernetes manifests or CI pipeline definitions Normalizing YAML before committing it Debugging "why won't this YAML parse" issues

// faq

No. Formatting runs entirely in your browser, so your data never leaves your machine — safe for config files, Kubernetes manifests, and CI pipelines.
Yes. It parses the document first, so a syntax error is reported immediately instead of silently producing broken output.
No. It parses the document into its underlying values and re-writes it — the structure, keys, and values are preserved; only whitespace and indentation are normalized.
Yes, but for that direction use the dedicated JSON to YAML converter — this tool expects YAML in and returns YAML out.
The most common causes are inconsistent indentation, a missing colon after a key, or mixing tabs and spaces. YAML is indentation-sensitive, so fixing the reported line usually resolves it.

// related

YAML to JSON JSON to YAML JSON Formatter Sort & Dedupe Lines Slug Generator

Use this via API

Get a free API key → 
curl -X POST https://snaptools.dev/api/v1/tools/yaml-formatter \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"yaml":"name: SnapTools version: 2 tags: - json - free"}'
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