Prettify your HTML code with customizable indentation
js-beautify library to format HTML. It handles indentation, line breaks, and preserves your code structure. Choose your preferred indentation style (2 spaces, 4 spaces, or tabs).
Founder & CEO, Toolraxy
Faiq Ur Rahman is a web designer, digital product developer, and founder of Toolraxy, a growing platform of web-based calculators and utility tools. He specializes in building structured, user-friendly tools focused on health, finance, productivity, and everyday problem-solving.
User Ratings:
ADVERTISEMENT
ADVERTISEMENT
HTML Formatter is a tool that takes raw HTML code and applies consistent formatting rules to make it readable. When HTML is minified (all spaces and line breaks removed) or written with inconsistent indentation, it becomes difficult to debug, edit, or understand. This tool adds proper indentation, line breaks, and spacing based on your preferences.
The result is clean, hierarchical HTML that clearly shows the relationship between parent and child elements, making your code easier to scan, maintain, and share.
Poorly formatted HTML creates real problems:
Debugging takes longer – When code is all on one line, finding a missing closing tag becomes a needle-in-haystack hunt
Team collaboration suffers – Inconsistent indentation leads to confusion and merge conflicts
Learning is harder – Beginners struggle to understand nesting when code isn’t properly indented
Code reviews are painful – Reviewers waste time deciphering structure instead of evaluating logic
Copy-paste errors increase – Minified code pasted into CMS platforms often breaks layouts
This HTML Formatter eliminates those issues. One click transforms chaos into clarity, following the same formatting principles used by professional developers worldwide.
Copy your messy, minified, or unformatted HTML and paste it into the Input HTML textarea.
Select your preferred indentation from the dropdown:
2 spaces – Compact, common in many projects
4 spaces – More visible indentation, popular in large codebases
1 tab – Accessible, lets users control display width in their editor
Press the Format button (or use the visual cue). The tool instantly processes your code and displays the formatted result in the output area.
Check the formatted output. If it looks good:
Click Copy Output to copy to clipboard
Or use Swap to move formatted code back to input for further editing
Click the Example button to load sample HTML. Experiment with different indentation styles to see how formatting affects readability.
HTML Formatter uses the js-beautify library, the same formatting engine trusted by millions of developers in editors like VS Code, Atom, and Sublime Text.
The formatting process:
Tokenization – The library breaks your HTML into tokens: opening tags, closing tags, attributes, text content, and comments.
Tree building – It analyzes tag relationships to understand nesting depth. Opening tags increase the indent level; closing tags decrease it.
Indentation application – Based on your selected style (2 spaces, 4 spaces, or tabs), the tool adds the appropriate number of indent characters before each line based on its nesting depth.
Special case handling:
Void elements (<img>, <br>, <input>, etc.) are not indented internally
Inline elements may retain compact formatting
HTML comments are preserved with appropriate spacing
Output generation – The formatted code is assembled with proper line breaks and returned to you.
The result is HTML that follows consistent, professional formatting standards—ready for debugging, sharing, or publishing.
Before formatting (minified):
<div><h1>Welcome to Our Site</h1><p>We offer <strong>amazing</strong> products.</p><ul><li>Product 1</li><li>Product 2</li><li>Product 3</li></ul><div class="footer"><p>Copyright 2025</p></div></div>
This code works in browsers but is impossible to read or edit without significant effort.
After formatting (4 spaces):
<div> <h1>Welcome to Our Site</h1> <p>We offer <strong>amazing</strong> products.</p> <ul> <li>Product 1</li> <li>Product 2</li> <li>Product 3</li> </ul> <div class="footer"> <p>Copyright 2025</p> </div> </div>
What changed:
Each nested element is indented one level deeper
Opening and closing tags align vertically
The hierarchy is visually obvious
Missing tags are easier to spot
With 2 spaces or tabs, the structure remains clear while adapting to your preferred style.
Instant formatting – No waiting, no server calls, no limits
Three indentation options – 2 spaces, 4 spaces, or tabs to match your team’s style guide
Swap function – Move formatted code back to input for iterative editing
Copy to clipboard – One-click copying for quick pasting into editors
Example included – Learn with pre-loaded sample HTML
No registration – Free forever, no accounts required
Privacy-focused – All processing happens in your browser; your code never leaves your device
Industry-standard engine – Uses the same formatter trusted by professional developers
| User Type | How They Benefit |
|---|---|
| Web Developers | Clean up minified code, maintain consistent style |
| Beginners Learning HTML | See proper nesting and structure visually |
| Content Managers | Format HTML pasted from editors or CMS exports |
| Email Newsletter Designers | Prepare readable HTML for email templates |
| Technical Writers | Format code examples for documentation |
| Team Leads | Enforce consistent formatting across projects |
| Freelancers | Deliver clean, professional code to clients |
If your HTML has missing closing tags or syntax errors, formatting may produce unexpected results. Fix major errors first, then format.
For extremely large HTML files (>500KB), formatting may take a few seconds. Be patient—the tool is working locally.
Choose one style and stick with it. Consistent indentation across your project is more important than which style you pick.
The formatter preserves inline elements (like <strong> inside paragraphs) without adding line breaks that would break readability.
Tags like <img> and <br> don’t need closing tags. The formatter knows this and won’t add unnecessary indentation inside them.
Always scan the formatted code to ensure it matches your expectations, especially if the input had complex nesting.
No syntax validation – The tool formats existing HTML but doesn’t fix errors like missing closing tags
Large file performance – Files over 1MB may cause noticeable delays (all processing is client-side)
Embedded CSS/JS – While preserved, these are formatted with basic rules, not specialized CSS/JS formatters
Template languages – HTML mixed with PHP, Jinja, or other templating languages may not format correctly
Whitespace preservation – In rare cases, significant whitespace in text content may be altered
Proper indentation is the foundation of readable HTML. Each level of nesting should increase the indent by a consistent amount. This visual hierarchy lets you see at a glance which elements are children of which parents.
Rules of thumb:
Indent every child element one level deeper than its parent
Keep opening and closing tags at the same indentation level for complex blocks
Use consistent indentation throughout your entire project
For inline elements (<span>, <strong>, <em>), keep them on the same line as surrounding text
Indentation doesn’t affect how browsers render HTML, but it dramatically impacts developer experience.
Void elements (also called self-closing or empty elements) are HTML tags that cannot have content or a closing tag. Common void elements include:
<img> – Images
<br> – Line breaks
<input> – Form inputs
<hr> – Horizontal rules
<meta> – Metadata
<link> – External resources
These elements should never be written with a closing tag (like </img>). The HTML formatter recognizes void elements and formats them appropriately without adding internal indentation.
Minification removes all unnecessary whitespace, comments, and sometimes shortens variable names to reduce file size. Used in production to speed up page loads.
Beautification (or formatting) adds whitespace to make code readable. Used during development, debugging, and learning.
Many developers work with minified code from CDNs or build tools and need beautification to understand or debug it. This tool bridges that gap.
Research consistently shows that readable code reduces bugs and speeds up development. For HTML specifically, clear indentation helps teams:
Identify missing closing tags faster
Understand component structure without documentation
Reduce merge conflicts by maintaining consistent style
Onboard new members more quickly
Adopting a team-wide formatting standard is one of the lowest-effort, highest-impact improvements you can make.
Formatting and validation are complementary processes:
Validation checks if your HTML follows proper syntax rules
Formatting organizes your code for readability
Always validate HTML after formatting, especially if the original code was minified. W3C’s HTML Validator is the industry standard for checking syntax correctness.
In HTML, most whitespace (spaces, tabs, newlines) is collapsed into a single space when rendered. This means you can format freely without affecting visual output—except in:
<pre> tags – Preserve whitespace
CSS white-space: pre elements
Text inside certain inline elements where spaces affect word boundaries
This flexibility is why HTML formatters can add extensive indentation without breaking layouts.
An HTML formatter takes messy, minified, or inconsistently indented HTML and adds proper spacing, line breaks, and indentation to make it readable. It organizes the code hierarchically based on tag nesting without changing functionality.
2 spaces – Compact style, common in smaller projects
4 spaces – More visible indentation, popular in large codebases
Tabs – Accessible choice; users can adjust display width in their editor
Choose whatever matches your team’s style guide or personal preference. Consistency matters more than the specific choice.
No. Formatting only changes whitespace—spaces, tabs, and line breaks. It does not modify tags, attributes, or content. Your HTML will look cleaner but function identically.
Yes. The formatter preserves embedded styles and scripts while applying basic formatting. However, for specialized CSS or JS formatting, consider using dedicated CSS/JS beautifiers.
No. All formatting happens locally in your browser using JavaScript. Your HTML never leaves your device, making this tool safe for proprietary or sensitive code.
These terms are used interchangeably. All refer to the process of adding consistent whitespace to code to improve readability. This tool uses the industry-standard js-beautify library.
Possible reasons:
Your original HTML had missing closing tags or syntax errors
The input contained non-standard HTML or template syntax
You’re viewing with a monospaced font that displays spaces differently
Try validating your HTML first, then format again.
This version processes one block at a time. For batch processing, consider using command-line tools like js-beautify with scripts.
HTML minifiers remove whitespace to reduce file size. HTML formatters add whitespace to improve readability. They serve opposite purposes—use formatters during development, minifiers for production.
ADVERTISEMENT
ADVERTISEMENT
