Most online HTML tools do one thing. You need to format messy minified HTML, so you open one tab. You need to minify it back for production, so you open another. You need to find the line where the syntax broke - third tab.
We just shipped a single page at AT USE that covers all three: HTML Formatter + Minifier
What it does
Beautify - takes any HTML (minified, hand-written, CMS-output) and formats it with clean 2-space indentation. Handles inline elements, void elements, and deeply nested structures correctly.
Minify - strips whitespace and collapses output to a single line. Shows input size, output size, and reduction percentage.
Validate - parses via libxml, returns errors with exact line number and column. Filters out libxml's false positives on HTML5 semantic elements (
, , etc.) so you only see real issues.Why server-side matters
Every browser-only HTML tool I've seen stalls or silently fails on files above a few hundred KB. This one accepts .html and .htm files up to 20 MB, processed server-side. Nothing is stored.
The practical case: you're working with a CMS or template engine that outputs a 2 MB HTML file. Paste won't work, and most browser tools choke. Upload works.
Details
- Three-tab interface: Beautify / Minify / Validate
- Default tab: Beautify (most common task)
- Download output as index.html (beautify) or index.min.html (minify)
- No signup, no watermark, permanent free
? at-use.com/tools/html-formatter
Built this as part of AT USE's developer tools cluster (alongside JSON Formatter, XML Formatter, CSS Formatter, Base64 Encoder/Decoder, and others). Happy to answer questions.
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