HTML Beautifier
Pretty-print messy HTML into clean, readable markup right in your browser. Paste or upload your code, pick an indent style, and get perfectly nested HTML in an instant.
100% Client-Side Processing
Your HTML is parsed and beautified entirely in your browser. Nothing is uploaded to a server.
Live preview
The preview runs in a sandboxed frame with scripts disabled, so pasted <script> tags are shown but never executed.
Table of Contents
What is an HTML Beautifier?
An HTML beautifier takes cramped, minified, or inconsistently indented HTML and rewrites it with clean, predictable indentation so the nesting of every tag is obvious at a glance. It's the fastest way to turn a wall of markup into something you can actually read and debug.
This tool parses your HTML with the browser's own built-in parser — the same engine that renders web pages — so it handles real-world, imperfect markup (unclosed tags, mixed casing, missing quotes) exactly the way a browser would, then re-indents it cleanly from that corrected structure.
How it Works
- Add your HTML: Paste HTML directly into the editor, or upload an .html file.
- Pick an indent style: Choose 2, 4, or 8 spaces, or a tab, to match your preferred formatting.
- Review instantly: Your beautified HTML and a live sandboxed preview update as you type.
- Copy or download: Copy the result to your clipboard or download it as an .html file.
Features
- Paste HTML or upload an .html file
- Instant beautify with 2, 4, 8-space, or tab indentation
- Preserves <pre>, <script>, <style>, and <textarea> content exactly
- Keeps inline elements like <a>, <strong>, and <em> flowing naturally with surrounding text
- Live sandboxed preview so you can confirm nothing changed visually
- Output line count and size stats
- Copy to clipboard or download as .html
- 100% client-side processing for privacy
Best Practices
- Beautify before code review: consistent indentation makes it much easier for teammates to spot structural issues in a diff.
- Match your team's indent width: set the indent size to match your project's editor config (e.g. .editorconfig) so beautified output doesn't create noisy diffs.
- Check the preview after beautifying: confirm the rendered page still looks identical, especially around whitespace-sensitive inline text.
- Beautify once, then let your editor take over: use this tool for a one-off cleanup of pasted or legacy markup, then rely on your editor's formatter for ongoing edits.
- Keep a minifier handy for production: beautified HTML is for editing and review — minify it separately before shipping if file size matters.
Troubleshooting
The beautified output looks different from what I pasted
The browser's HTML parser automatically fixes structural issues like unclosed tags or missing quotes, so the output reflects the corrected structure — this matches how a real browser would render your original markup.
Attribute order or quoting changed
Attributes are re-serialized in their parsed order, and boolean attributes like disabled are written without a value. This doesn't affect rendering, but it can change a text diff.
Text inside <pre> or <script> looks untouched
That's intentional — content inside <pre>, <script>, <style>, and <textarea> is preserved exactly as-is, since whitespace and line breaks are often meaningful there.
I need to shrink my HTML instead of beautify it
This tool is beautify-only. For minifying HTML to reduce file size, use the HTML Formatter tool, which supports both beautify and minify modes.
Common Use Cases
- Cleaning up scraped or exported HTML: reformat markup pulled from a CMS export, email template, or web scraper so it's readable again.
- Code review and debugging: beautify minified or compressed HTML from production to trace down a layout or markup bug.
- Standardizing a codebase: reformat HTML files to a consistent indent style before committing them to a shared repository.
- Preparing HTML snippets for documentation: beautify inline HTML examples so they're easy to read in a tutorial or README.
- Learning HTML structure: beautify someone else's markup to see how their page is actually nested and organized.
Frequently Asked Questions
No. The live preview renders inside a sandboxed iframe with scripts disabled, so pasted <script> tags are shown but never executed.
No. Beautifying only changes whitespace, indentation, and attribute serialization — the actual markup structure and visible output stay the same.
It uses the browser's built-in parser, which automatically corrects common issues like unclosed tags, so the output is always valid — but it won't flag or explain what was fixed.
It's preserved exactly as-is, since whitespace inside those elements is often significant.
Yes. Choose 2, 4, or 8 spaces, or a tab character.
No, this tool only beautifies. If you need to minify HTML to reduce file size, use the HTML Formatter tool, which has a dedicated Minify mode.
No. Everything happens locally in your browser, and nothing is uploaded or saved.