HTML Formatter
LiveBeautify HTML code with proper indentation, nesting, and readability.
Understanding HTML Markup
HTML provides the semantic structure of every web page — headings, paragraphs, lists, tables, forms, navigation, and embedded content are all defined through HTML markup. As web applications grow in complexity with component-based frameworks, server-side rendering, and template engines, HTML output frequently arrives as a single compressed line or with inconsistent nesting depth. Properly formatted HTML reveals the document outline, makes accessibility attributes visible, exposes unclosed tags, and enables meaningful code review.
Format and beautify raw HTML code with proper indentation and tag nesting.
The Devkitr HTML Formatter parses raw HTML and rebuilds it with consistent indentation, attribute alignment, and proper tag nesting visualization. It handles doctype declarations, nested elements, self-closing tags, embedded SVG, script and style blocks, and custom web component elements while preserving whitespace-sensitive content like <pre> and <code> blocks.
In a typical development workflow, HTML Formatter becomes valuable whenever you need to beautify html code with proper indentation, nesting, and readability. Whether you are working on a personal side project, maintaining production applications for a company, or collaborating with a distributed team across time zones, having a reliable browser-based formatting tool eliminates the need to install desktop software, write one-off scripts, or send data to third-party services that may log or retain your information. Since HTML Formatter processes everything locally on your device, your data stays private and your workflow stays uninterrupted — open a browser tab, paste your input, get your result.
Key Features
Smart Indentation
Indents nested elements to show document hierarchy while recognizing inline elements (span, a, strong) that should not break onto separate lines.
Attribute Formatting
Aligns multiple attributes on multi-attribute tags vertically for readability, particularly useful for tags with many data attributes or ARIA properties.
Whitespace Preservation
Recognizes <pre>, <code>, <textarea>, and <script> blocks where whitespace is meaningful and preserves their internal formatting.
Void Element Handling
Correctly formats self-closing elements (img, br, hr, input, meta, link) without adding incorrect closing tags.
How to Use HTML Formatter
Paste Your HTML
Copy raw HTML from a page source, template engine output, server response, or CMS export into the input panel.
Configure Indent Style
Choose between 2-space, 4-space, or tab indentation to match your project conventions.
Review the Structure
Scan the formatted output to verify proper nesting, catch missing closing tags, and read attribute configurations clearly.
Copy the Clean HTML
Copy the formatted HTML for use in templates, documentation, email layouts, or component markup files.
Use Cases
Inspecting Minified Page Source
Format the compressed HTML returned by View Source to understand the page structure, find specific elements, and trace rendering issues.
Cleaning CMS-Generated Markup
Content management systems often produce messy HTML with inconsistent indentation. Format it to audit the structure and clean up unnecessary markup.
Reviewing Email Templates
HTML email templates use complex nested tables for layout. Formatting reveals the table structure and makes inline styles readable.
Debugging Accessibility Markup
Format HTML to make ARIA attributes, role values, and semantic landmarks visible for accessibility auditing.
Pro Tips
Use 2-space indentation for HTML to keep deeply nested template structures manageable — HTML can nest 8-10 levels deep in complex layouts.
Run HTML through the formatter before comparing versions — consistent formatting ensures diffs show only meaningful structural changes.
Format component templates (Vue SFC, Svelte files) by extracting the template section first — mixed HTML/JS/CSS files may confuse HTML-only formatters.
Check that the formatter preserves your conditional comments (<!--[if IE]>) and template directives (ng-if, v-for, {#each}) correctly.
Common Pitfalls
Formatting HTML that contains template syntax ({{ }}, <% %>) as pure HTML
Fix: Template strings may be parsed as HTML content. Use a formatter that recognizes your template language, or format only the static HTML portions.
Adding closing tags to void elements like <img/>
Fix: HTML5 void elements (img, br, hr, input, meta) must not have closing tags. Remove </img> if added and use <img> without a slash in HTML5.
Relying on formatted indentation for debugging without checking the actual DOM
Fix: Source HTML and rendered DOM can differ due to parser error recovery. Use browser DevTools Elements panel to see the actual DOM tree.
Frequently Asked Questions
QDoes it fix broken HTML?
The formatter focuses on indentation and readability. It does not auto-close missing tags or fix structural errors.
QAre inline elements handled differently?
Yes. Inline elements like <span>, <a>, and <strong> are kept inline when appropriate to preserve semantics.
QDoes it preserve script and style content?
Yes. Content inside <script> and <style> tags is preserved and indented separately.
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