HTML Formatter
Format and beautify unindented or minified HTML5 markup with standardized 2-space indentation and clean parent-child tag hierarchy.
Quick Answer & Understanding Your Result
An HTML Formatter beautifies and standardizes unindented, messy, or minified HTML5 markup into clean, 2-space indented hierarchical structures.
Core HTML Formatting Capabilities
- Hierarchical 2-Space Indentation: Perfectly indents nested
<div>,<section>, and semantic HTML5 parent-child trees. - Embedded Script & Style Formatting: Automatically indents internal JavaScript (
<script>) and CSS (<style>) blocks. - Void & Self-Closing Tag Handling: Standardizes void elements (
<img>,<input>,<meta>,<br>) according to modern HTML5 standards.
Web Development Applications
- Frontend Template Prettification: Cleaning up dynamically rendered JSX/HTML strings for code reviews.
- Scraped HTML Beautification: Making minified production markup readable for inspection and debugging.
Paste your raw HTML markup above to format and prettify your code instantly.
Formula & Calculation Logic
Technical Specification & ASTDOM formatting pipeline:
- Tokenizes HTML tags, content nodes, and comments, reconstructing clean tag hierarchy.
Step-by-Step Guide
Paste HTML Markup
Paste unformatted or single-line HTML into the editor.
Deterministic DOM Indentation
The engine recalculates tag depths and formats the markup in 0ms.
Copy Beautified HTML
Copy clean HTML code or download as an .html file.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| Single-Line HTML to Formatted | Formatted nested elements with 2-space indentation hierarchy. | ||
| Interactive Dashboard Card | Provides instant quantitative evaluation for comparative practical analysis. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
W3C HTML5 Specification
JS-Beautify Code Formatter
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: Formatted HTML = js_beautify.html(input, indent_size: 2, wrap_line_length: 120 )
Last Reviewed: August 21, 2026
Primary Source: W3C HTML5 Specification
Reference Document: JS-Beautify Code Formatter
Computation Privacy: 100% client-side 0ms computation, zero data retention
All algorithms, formatters, and data conversions run 100% locally in your browser following official technical standards (RFC, ISO, W3C). Output should be verified prior to mission-critical production deployment.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.