HTML and CSS
Analyzer and Minifier

Minifying removes what browsers don't need (comments, extra spaces, long color codes) so files download faster. But on most sites, the bigger wins are elsewhere: CSS the page never uses, scripts that block the first paint and images without dimensions that make the page jump. This tool shows both, in plain words.

HTML report

• Tags that aren't closed properly (with line numbers), duplicate IDs, and a missing doctype, language, character set, viewport or title.
• Speed problems: render-blocking scripts in the head, a lazy-loaded top image, images without width and height (which cause layout shift), too many elements and heavy inline styles and scripts.
• A safely minified version, with comments and spacing removed without touching <pre>, text areas, scripts or the spaces between words, plus a readable "beautified" version.

CSS report

• Unused CSS on the page: fetch a page and see, for each stylesheet, how many rules match nothing on it.
• Mistakes and upkeep problems: unbalanced braces, @import chains, fonts without font-display, piles of !important, duplicate selectors and properties, and old vendor prefixes.
• Minified and beautified versions with real compressed (gzip) sizes, so you see the saving visitors actually get.