Free HTML Beautifier Online

Beautify and format messy HTML code with proper indentation. Also minify HTML to reduce file size.

Last updated May 8, 2026

Input HTML152 chars

Output

Indent:

Most HTML you encounter in real-world debugging is a mess — minified for production with no whitespace, dumped from "View Source" with bizarre indentation, exported from WYSIWYG editors with deeply nested wrapper divs, or pasted from a CMS that adds inline styles to every element. Reading 800 unbroken characters of nested HTML to find a bug is the kind of task that costs hours. Our free online HTML beautifier formats messy, minified, or poorly-indented HTML into clean, properly-indented, line-broken markup that is actually readable. Paste in any HTML — full pages, fragments, email templates, server response bodies, copied "View Source" output — and click Beautify. The output uses your chosen indentation size (2 spaces, 4 spaces, or tabs) to show the document hierarchy clearly, with one element per line and inline elements (span, a, strong, em) intelligently kept on the same line as their parent text rather than artificially broken up. Use it the other direction too: paste your hand-formatted HTML and click Minify to strip all whitespace, comments, and line breaks for production deployment — typical reductions of 15-30% on text-heavy markup that adds up over thousands of page views. Common workflows: debugging an email template where the WYSIWYG editor produced unreadable nested table HTML, cleaning up scraped HTML before processing it programmatically, formatting a server response captured in DevTools to find a missing closing tag, preparing HTML for a code review where readability matters, and minifying static HTML for a small site where build tooling is overkill. The beautifier handles all HTML5 syntax correctly: self-closing void elements (img, br, hr, meta, input), inline versus block element distinction (so paragraphs of text with inline tags do not get artificially broken across lines), HTML comments preserved or stripped depending on mode, doctype declarations, conditional comments for old IE, custom elements (web components), and attributes with multi-line values. **Important boundary:** the beautifier formats existing HTML — it does not fix syntactic errors like missing closing tags, mismatched elements, or invalid nesting. For that, use a proper HTML validator (W3C Markup Validation Service for the full spec check) or run the HTML through a parser that reports structural issues. Everything runs in your browser using JavaScript — your HTML, including any sensitive data inside it (customer details on order pages, internal API responses, draft content), never travels to any server. Pair this with our [CSS Minifier](/tools/css-minifier) for stylesheets, [CSS & JS Minifier](/tools/css-js-minifier) for combined optimisation, [Code Beautifier](/tools/code-beautifier) for general code formatting, and [HTML to PDF](/tools/html-to-pdf) when you need to convert formatted HTML to a printable document.

How to Use HTML Beautifier

Paste Your HTML

Copy and paste your HTML code into the input area. Supports any valid or messy HTML content — full pages, fragments, email templates, server responses, copied "View Source" output.

Choose Format or Minify

Click "Beautify" for clean formatting with indentation, or "Minify" to compress for production. Choose indentation size (2 spaces is web standard, 4 is alternative, tab for older code styles).

Copy the Result

Review the formatted output in the side-by-side display, see the size comparison if minifying, and copy the result to your clipboard with one click.

Features

Smart Indentation

Automatically detects HTML structure and applies proper nesting with configurable indent size. Inline elements (span, a, strong) stay on the same line as parent text instead of artificially breaking up sentences.

HTML Minifier

Compress HTML by removing comments, whitespace, and unnecessary characters. Typical reduction of 15-30% on text-heavy markup, useful for production deployment without a full build pipeline.

Inline Element Handling

Correctly distinguishes inline elements from block elements — paragraphs of text with inline `<a>`, `<strong>`, `<em>` tags stay readable instead of being broken across multiple lines per element.

HTML5 Compatible

Handles all HTML5 syntax correctly: self-closing void elements, custom elements (web components), conditional comments, doctype declarations, and attributes with multi-line values.

Configurable Indent

Choose 2 spaces (web standard, the default), 4 spaces (alternative), or tab characters (some older code styles). Match your project's existing convention or your team's style guide.

Browser-Based & Private

All formatting happens in your browser using JavaScript. Your HTML and any embedded data never travel to any server, never get logged, and discarded the moment you close the tab.

Benefits of Using HTML Beautifier

Completely Free

Use HTML Beautifier without any cost, limits, or hidden fees. No premium plans needed.

No Installation

Works directly in your browser. No software downloads or plugins required.

100% Private

Your files and data are processed locally. Nothing is uploaded to external servers.

Works Everywhere

Compatible with Chrome, Firefox, Safari, Edge on desktop, tablet, and mobile.

No Sign-Up

Start using the tool immediately. No account creation or email verification.

Always Available

Access this tool 24/7 from anywhere in the world, on any device.

Frequently Asked Questions

No, the beautifier formats existing HTML but does not fix structural errors like missing closing tags, mismatched elements, or invalid nesting. It assumes the input is well-formed and just reformats it. For checking validity (does this HTML conform to the HTML5 spec?), use the W3C Markup Validation Service or your IDE's HTML linting. Common errors to fix manually before beautifying: unclosed tags, attributes without quotes, ampersands not escaped to `&`, and elements nested inside elements they cannot contain (e.g., a `<div>` inside a `<p>`).

Three options: 2 spaces (the de facto web standard, used by most modern frameworks like React, Vue, Angular, and recommended by the Google HTML/CSS style guide), 4 spaces (alternative used by some older projects and some Python-influenced teams), and tab characters (some legacy code styles, more compact in storage but less consistent across editors). Pick the option that matches your project's existing convention.

Yes. The "Minify" button removes all comments, extra whitespace, and unnecessary line breaks to produce the smallest possible output. Typical reductions of 15-30% on text-heavy markup, somewhat less on graphics-heavy pages where the HTML already has minimal padding. For SEO and Core Web Vitals, minified HTML loads faster, parses faster, and improves Time to First Byte (TTFB) and Largest Contentful Paint (LCP). Combined with gzip compression on the server, the wire size reduction is dramatic.

For modern HTML following standard syntax, no — minification only removes whitespace and comments that browsers ignore anyway. Edge cases where minification can affect rendering: (1) `<pre>` blocks that depend on whitespace are preserved correctly, (2) `<textarea>` initial content with whitespace is preserved, (3) inline-block layouts that depend on whitespace between elements may shift slightly (rare in modern flexbox/grid layouts). If you have an unusual HTML pattern that breaks after minification, the cause is almost always whitespace-sensitive CSS — fix the CSS to be less brittle, do not avoid minification.

Yes, inline `<script>` blocks and `<style>` blocks are preserved exactly as-is. JavaScript inside `<script>` tags is not modified (use our [CSS & JS Minifier](/tools/css-js-minifier) separately if you also want to minify the script content). CSS inside `<style>` tags is similarly preserved. The beautifier only formats the surrounding HTML structure, not the embedded code.

JSX, Handlebars, and other template syntax is technically not standard HTML, so beautifier behaviour varies. Most simple template syntax (`{{ variable }}`, `<%- partial %>`) passes through cleanly because it looks like regular text or attribute values. JSX-specific patterns (`{condition && <Element />}`, fragments `<>...</>`) may not format perfectly — for JSX-specific formatting, use Prettier as part of your editor setup. The beautifier here is designed for regular HTML; treat template-language formatting as a bonus.

Yes, completely free with no limits on file size, number of formats per day, or any feature gating. The tool runs in your browser, so there is no server cost on our side that would require limits. No registration required.

No. The beautifier runs entirely in your browser using JavaScript. Your HTML is parsed locally, the formatted output is generated locally, and nothing travels over the network. This privacy posture matters when formatting HTML containing customer details, internal API responses, draft content, or any other data you would not want sitting on a third-party server.

Complete Your Developer Tools Workflow

These free tools work seamlessly with HTML Beautifier to handle every step of your workflow.

CSS Minifier →

Format and minify CSS

CSS & JS Minifier →

Combined CSS and JS optimisation

Code Beautifier →

General code formatting

HTML to PDF →

Convert formatted HTML to PDF

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