Upload or paste HTML and format it into clean, well-indented, easy-to-read markup you can copy or download in seconds.
Beautify and format HTML code instantly in your browser. XConvert's free HTML Formatter adds proper indentation, consistent line breaks, and organized tag structure so your markup is easy to read, debug, and maintain — no server uploads, no sign-ups required.
Step 1 — Paste or Upload Your HTML
Open the XConvert HTML Formatter and paste your minified or messy HTML into the input panel. You can also drag-and-drop an .html file directly onto the editor. The tool accepts anything from a small HTML snippet to a complete page with embedded CSS and JavaScript.
Step 2 — Choose Your Formatting Options
Select your preferred indentation (2 spaces, 4 spaces, or tabs) from the toolbar. Additional options include wrapping attributes onto separate lines when a tag exceeds a configurable line length, preserving whitespace inside <pre> and <code> tags, and controlling blank lines between block-level elements. These settings let you match your project's coding standards.
Step 3 — Click "Format" Press the Format button. The tool parses your HTML entirely inside your browser, restructures the whitespace according to your chosen options, and renders the result with syntax highlighting. Tags, attributes, text content, and comments each receive distinct colors for easy scanning.
Step 4 — Copy or Download the Result
Click Copy to place the formatted HTML on your clipboard, or click Download to save it as an .html file. The output is ready to paste into your code editor, CMS, or version-control system.
HTML formatting — also called HTML beautifying or pretty-printing — is the process of adding structured whitespace to HTML markup so that the document's hierarchy is visually clear. A formatter indents child elements relative to their parents, places each block-level element on its own line, aligns attributes consistently, and separates logical sections with blank lines.
The rendered output in a browser does not change (with minor exceptions around inline whitespace). Formatting is purely a developer-experience improvement: it makes the source code easier to read, navigate, and maintain. When you can see the nesting structure at a glance, you catch unclosed tags, misplaced elements, and accessibility issues much faster.
Consistent HTML formatting is especially valuable in team environments. It reduces merge conflicts in version control, speeds up code reviews, and helps new team members understand the document structure. It also pairs well with linting tools that enforce coding standards — a formatter handles the whitespace, while a linter catches semantic issues.
| Feature | XConvert HTML Formatter | Prettier (CLI/IDE) | js-beautify (CLI) | Online Alternatives |
|---|---|---|---|---|
| Cost | Free | Free | Free | Free / Freemium |
| Installation | None (browser-based) | Required | Required | None |
| Privacy | Client-side only | Local | Local | Often server-side |
| Syntax Highlighting | ✅ | Editor-dependent | ❌ | Varies |
| Custom Indentation | ✅ | ✅ | ✅ | Varies |
| Attribute Wrapping | ✅ | ✅ | ✅ | Varies |
Preserve <pre> Whitespace |
✅ | ✅ | ✅ | Varies |
| Embedded CSS/JS Formatting | ✅ | ✅ | ✅ | Varies |
| Drag-and-Drop Upload | ✅ | ❌ | ❌ | Varies |
| Works Offline | ✅ (after page load) | ✅ | ✅ | Rarely |
Unminifying Production HTML — When inspecting a live website's source, you often encounter minified HTML. Paste it into the formatter to restore the nesting structure and understand the page layout. This is essential when browser DevTools' element inspector does not provide enough context about the overall document structure.
Cleaning Up CMS Output — Content management systems and WYSIWYG editors frequently generate messy, inconsistently indented HTML. Formatting the output before committing it to a template repository keeps the codebase clean and makes future edits predictable. This is especially common with WordPress, Drupal, and other CMS platforms.
Debugging Template Engines — Server-side template engines (EJS, Handlebars, Jinja, Thymeleaf, Pug) can produce HTML with erratic indentation because the template logic does not align with the output structure. Formatting the rendered output helps you verify that the template logic produces the correct nesting and element hierarchy.
Preparing Code Examples — HTML snippets in tutorials, documentation, or blog posts should be well-formatted so readers can follow the structure without confusion. The formatter ensures consistent, professional-looking examples that are easy to copy and adapt.
Accessibility Audits — Properly indented HTML makes it easier to verify that ARIA attributes, landmark roles, heading hierarchies, and form labels are correctly placed. You can visually trace the DOM tree without relying solely on browser DevTools, catching issues like skipped heading levels or missing landmark regions.
Email Template Development — HTML email templates are notoriously complex, with deeply nested tables and inline styles required for cross-client compatibility. Formatting these templates reveals the structure and makes it easier to locate the specific table cell, <td>, or conditional comment you need to edit.
XConvert's HTML Formatter uses a client-side HTML parser that builds a DOM-like tree from the input markup. Unlike a regex-based approach, the parser understands HTML semantics: it knows which elements are block-level versus inline, which elements are void (self-closing, like <img>, <br>, <input>), and which elements have special whitespace rules (like <pre>, <code>, <textarea>). This knowledge allows the formatter to make intelligent decisions about where to insert newlines and indentation without altering the rendered output. The parser also handles HTML5 features like custom elements, <template> tags, and <slot> elements correctly.
Embedded <style> and <script> blocks are formatted using the same engines that power the standalone CSS Formatter and JS Formatter. This means you get consistent, language-aware formatting for all three languages in a single pass. Inline event handlers and style attributes are left as-is to avoid unintended side effects, but the surrounding HTML structure is properly indented. The multi-language formatting ensures that a single HTML file with embedded styles and scripts comes out clean and readable throughout, not just in the HTML portions.
All processing runs in the browser with no server communication. Your HTML — which may contain internal URLs, unreleased content, sensitive form structures, or proprietary component markup — stays on your machine. The formatter handles documents up to several megabytes and works in all modern browsers including Chrome, Firefox, Safari, and Edge. For extremely large files (e.g., full single-page application bundles or server-rendered pages with extensive inline data), consider formatting individual components or partials instead. After formatting, you can use the HTML Minifier to compress the markup back down for production deployment.
Preserve <pre> Content — Ensure the "Preserve Preformatted" option is enabled so that whitespace inside <pre> and <code> tags is not altered. These elements rely on exact whitespace for correct rendering.
Use Consistent Indentation — Pick one indentation style (2 spaces is common for HTML) and use it across your entire project. Mixing styles creates noisy diffs and confuses collaborators.
Wrap Long Attribute Lists — For elements with many attributes (common in frameworks like Angular or React), enable attribute wrapping to place each attribute on its own line. This improves readability and makes diffs cleaner.
Format Before Reviewing — Run HTML through the formatter before submitting it for code review. Reviewers can focus on structure and semantics rather than whitespace inconsistencies.
Combine with Minification — Use the formatter during development for readability, then run the HTML Minifier as a build step to strip whitespace before deploying to production.
Check for Unclosed Tags — If the formatter produces unexpected nesting, your HTML may contain unclosed tags. The formatter does its best to handle malformed HTML, but fixing the source is always better than relying on error recovery.
No. All processing happens client-side in your browser. Your HTML never leaves your device, making it safe for proprietary or unreleased content. There are zero network requests after the initial page load.
In almost all cases, no. The formatter only modifies whitespace between tags. The one exception is inline elements where whitespace between tags can affect rendering (e.g., gaps between <span> elements or spaces between <a> tags in a navigation bar). The formatter is conservative with inline elements to minimize this risk and preserves a single space where one existed in the original markup.
You can choose 2 spaces, 4 spaces, or tab characters. The default is 2 spaces, which is the most common convention in front-end development.
Yes. The formatter detects <script> and <style> blocks and formats their contents using the appropriate language rules, powered by the same engines as the JS Formatter and CSS Formatter. This gives you consistent, language-aware formatting across all three languages in a single pass.
The formatter attempts to handle malformed HTML gracefully (e.g., unclosed tags, mismatched nesting), but it is not a validator or fixer. For best results, ensure your HTML is valid before formatting. Use the W3C Markup Validation Service or your editor's built-in HTML linting to catch structural issues first.
The formatter is designed for standard HTML. JSX (React), Vue templates, Svelte, Angular templates, and other framework-specific syntaxes may not parse correctly due to non-standard attributes, expressions, and directives. Use framework-specific formatters (like Prettier with the appropriate plugin) for those syntaxes.
There is no hard limit, but performance is best for files under 5 MB. Very large documents may take a few seconds to process depending on your browser and hardware. For files exceeding 10 MB, consider formatting individual components or partials rather than the entire document.
Yes. HTML entities like &, <, —, and named entities are preserved as-is during formatting. They are not decoded or re-encoded. This ensures that special characters render correctly in the browser and that entity references used for accessibility or internationalization remain intact.
The HTML Formatter adds whitespace for readability, while the HTML Minifier removes whitespace to reduce file size. They are complementary — format for development, minify for production.
Yes. Once the page has loaded, all formatting happens locally. You can disconnect from the internet and continue working without interruption.