HTML Formatter
Format HTML in your browser.
This runs in your browser. Nothing is uploaded.
Drop a file here or choose oneChoose file
Format HTML privately
TheDevTab formats HTML in your browser. Nothing is uploaded while you paste, format, copy, or download a document.
The formatter works on text only. It does not execute scripts, load referenced resources, or connect to a server while formatting.
Formatter versus validator
A formatter changes layout so humans can review markup. This tool is not an HTML validator or linter, so malformed markup can still produce best-effort output and a tidy result can still have structural or accessibility problems.
Review the result in the context of the browser, framework, and HTML rules that your project uses. For text patterns around generated markup, try the Regex Tester.
What the formatter does
HTML Formatter puts tags on separate lines, indents nested elements by two spaces, keeps comments and doctypes, and recognizes void tags such as <br> and<img>. Text nodes are trimmed onto their own indented lines.
Script, style, pre, and textarea contents stay intact instead of being re-indented. Attribute order and text are preserved as much as practical, while malformed input is handled without a crash.
Use formatted HTML as a review aid
Start with the Sample action, paste markup, or drop a local.html file. Compare the formatted output with your original markup. Copy or download formatted.html after checking nesting, attributes, and embedded content. For another local formatting workflow, see theSQL Formatter.
FAQ
Does TheDevTab upload my HTML?
No. The HTML is tokenized and formatted in your browser. TheDevTab never receives the HTML.
Is HTML Formatter a validator or linter?
No. It is a best-effort formatter for readable indentation and layout. It does not prove that markup is valid, accessible, or safe for a specific browser or framework.
How does HTML Formatter handle void tags?
Void elements such as br, img, input, link, and meta stay at the current indentation level and do not receive child indentation. Both br and br/ are treated as void tags.
Are script and pre contents changed?
No. The contents of script, style, pre, and textarea elements are kept intact instead of being re-indented by the formatter.
Can I try an HTML sample or drop a file?
Yes. Select Sample to load a small document containing TheDevTab, or drop a local .html file. Formatting stays in the browser. Then copy or download the result.
Does the formatter support a particular browser or HTML dialect?
It uses lightweight, dialect-agnostic HTML tokenization in the browser. It is not a browser parser, framework formatter, validator, or linter.