CSS Class Extractor

The CSS Class Extractor scans HTML source code and lists every unique class name it finds, along with a count of how many times each one is used across the document. It reads every class attribute, splits multi-class values into individual names, and tallies them, giving you a precise inventory of the styling hooks a page relies on.

It is designed for front-end developers, design-system maintainers, and anyone working with utility-first frameworks where a single element can carry many classes. Knowing which classes appear and how often helps you find heavily reused patterns worth extracting into components, spot one-off classes that may be dead code, and confirm that a naming convention is applied consistently.

Everything runs locally in your browser using JavaScript, with no upload and no server round trip. Paste your markup or upload an HTML file, choose whether to sort by frequency or name, and the table is generated instantly. Because nothing leaves your device, you can safely analyse proprietary templates and internal component libraries.

Features

• Reads every class attribute and splits space-separated values into individual class names accurately.
• Counts how many times each class appears so you can measure real usage across the whole document.
• Sorts results by frequency to reveal the most reused classes, or alphabetically for quick lookup.
• Handles both single and double quoted class attributes so no styling hook is overlooked.
• Ignores commented-out markup so classes inside HTML comments never inflate the counts.
• Reports the number of unique classes and total class usages as quick summary statistics.
• Exports the table to CSV or XLSX, or copies it to your clipboard for documentation or refactoring.

How to use CSS Class Extractor

1. Paste your HTML source into the input box, or upload an .html, .htm, or .txt file from your device.
2. Pick a sort order, choosing frequency to rank the most-used classes or name for an alphabetical list.
3. Read the table to see each unique class alongside the number of elements that use it.
4. Look for high-count classes worth turning into components and one-off classes that may be unused.
5. Check the stats for the total number of unique classes and total usages across the page.
6. Export the results to CSV or XLSX, or copy the table into a refactoring plan or style audit.

Benefits

• Developers identify the most reused classes that are strong candidates for extraction into components.
• Design-system teams verify that naming conventions are applied consistently across the markup.
• Utility-framework users audit how many distinct classes a page carries and where bloat accumulates.
• Refactoring teams find rarely used one-off classes that may be safe to remove or consolidate.
• QA engineers confirm that expected state and variant classes are actually present on elements.
• Anyone handling private templates keeps proprietary class names on their device with local processing.

Utility-first CSS frameworks encourage stacking many small classes on a single element, which makes it hard to judge by eye which patterns repeat and which are one-offs. A usage count reframes that instantly: classes with high counts represent recurring visual patterns that often deserve to be captured as reusable components or shared utilities, while classes that appear only once may be accidental duplicates or leftovers from an earlier design that can be cleaned up.

Sorting by frequency is the fastest way to understand a page's styling footprint, since the classes doing the most work rise to the top. Sorting by name is better when you are checking whether a specific class exists or auditing a naming scheme for consistency, for example confirming that every state modifier follows the same prefix. Comments are stripped before counting so disabled markup never distorts the picture.

The extractor works entirely with a regular-expression scanner in your browser, so nothing is uploaded and it functions even during server-side rendering. It reports the class names exactly as written in the markup and cannot tell whether a matching rule exists in your stylesheet, so it measures usage in the HTML rather than confirming the styles are defined. Combine it with the HTML ID Extractor for a fuller structural audit.