HTML Beautifier
Format and beautify HTML code for better readability
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What the HTML beautifier does
The HTML beautifier reads your markup, parses the tag tree, and rewrites it with consistent indentation and line breaks. It walks each element, tracks how deeply it is nested, and adds spacing so that parent and child tags line up in a clear hierarchy.
The result is markup you can scan by eye. Attributes stay intact, content stays intact, and only the whitespace between tags changes. Everything runs in your browser, so the code you paste never leaves your machine.
Why formatting matters
Minified or hand-edited HTML often collapses into long single lines with no visible structure. When indentation is missing, a browser still renders the page, but a person cannot tell where a section opens or closes. That makes bugs hard to find.
Using an HTML formatter online restores that structure without changing what the page displays. Clean indentation helps in a few practical ways:
- Mismatched or unclosed tags become visible because the nesting no longer lines up.
- Code reviews go quicker when every element sits on its own indented line.
- Copying markup out of a build output or a saved page becomes readable again.
- Teammates inherit a consistent layout instead of one person's spacing habits.
How to beautify HTML code
The tool works on text you supply directly. Once you paste markup and run it, the parser rebuilds the document with proper indentation and hands back the output for you to copy or save.
- Open Code Tools and select "HTML Beautifier".
- Paste your HTML into the input textarea.
- Click the "Beautify" button.
- Read the formatted HTML in the output area, with nesting and indentation applied.
- Copy the result or download it as a file.
Here is the kind of change you can expect when you prettify HTML that arrived as one line:
<ul><li>One</li><li>Two</li></ul>
<ul>
<li>One</li>
<li>Two</li>
</ul>When to use it
Reach for this HTML beautifier online whenever markup is hard to read and you need structure back before you edit. Because processing happens locally, it suits both quick checks and larger blocks of code.
- You copied compressed markup from a page source and want to study it.
- You inherited a template with inconsistent indentation and want one clean layout.
- You are debugging a layout and suspect a tag is unclosed.
- You pasted output from a generator that emits everything on a single line.
When your goal is the opposite, shrinking a file for delivery, use the HTML Minifier to strip whitespace and comments. For related assets, the CSS Beautifier and CSS Minifier handle stylesheets the same way.
How this differs from other formatters
Many tools that beautify HTML code upload your input to a server first. This one parses and rewrites the markup entirely in the browser tab, so nothing is transmitted. A few other differences:
- Formatting and compression live in separate tools, so each does one job clearly.
- The output keeps your content and attributes exactly as written; only spacing changes.
- You can copy or download the result without creating an account.
- It sits alongside other DevSwitch code tools for converting, comparing, and encoding data.
FAQ
It is a tool that reformats HTML markup. It parses the tag tree, tracks how each element nests, and rewrites the code with consistent indentation and line breaks. The content and attributes stay the same, and only the whitespace between tags changes. The output reads clearly, so you can scan structure and spot mistakes.
No. The tool only adjusts whitespace between tags to create indentation. Browsers ignore extra spacing between block elements, so the rendered page stays identical. Your text, attributes, and tag order remain untouched. If a visible difference appears, it means the original markup relied on specific whitespace, which is rare in normal HTML.
No. All parsing and reformatting happen in your browser tab. The HTML you paste is never transmitted or stored anywhere. This means you can format markup that contains internal notes or unpublished content without it leaving your device. When you close the tab, the input and output are gone.
They do opposite things to the same markup. Beautify adds whitespace, so it inserts indentation and line breaks that reflect the nesting of your tags, producing readable code. Minify removes whitespace, comments, and optional closing tags to reduce file size for delivery. Use beautify while editing, then minify the final version if you want a smaller download.
It does not rewrite invalid markup, but it makes problems visible. Because the tool indents by nesting level, an unclosed or misplaced tag throws the indentation off in an obvious way. You still fix the error yourself, yet the reformatted layout points you to where the tree stops lining up, which speeds up finding the cause.
Open the HTML Beautifier under Code Tools, paste your markup into the input textarea, then click the "Beautify" button. The formatted HTML appears in the output area with indentation and nesting applied. From there you can copy the result to your clipboard or download it as a file. No setup or sign-in is needed.
There is no fixed line or character cap. Because the work runs in your browser, the practical limit is your device memory. Small snippets format at once. Very large documents may take a moment while the parser walks the full tag tree, but they still process locally without any upload.
The tool focuses on HTML structure and indents your tags. Style and script blocks inside the markup are kept as content. For dedicated stylesheet formatting, use the CSS Beautifier , which reformats CSS rules on their own. Keeping the tools separate means each one applies rules made for that language.
Yes. Beautify both versions first so they share the same indentation, then paste them into the Diff Checker . Consistent formatting matters here, because a comparison tool flags every changed line. If one version is minified and the other is not, you would see false differences. Formatting both removes that noise and shows real changes only.
Yes, slightly. Adding indentation and line breaks inserts extra whitespace characters, so the formatted file is a little larger than a single-line version. That trade is fine while you edit, since readability matters more there. Before shipping, run the markup through the HTML Minifier to strip that whitespace and bring the size back down.
No. The tool runs in your web browser, so there is nothing to download or install and no account to create. Open the page, paste your markup, and format it. Since all processing is local, it also works when you save the page and open it later while offline.