Webperf & SEO Tools — Free Online

Preview how your page title and meta description appear in Google search results.

Generate JSON-LD structured data for Article, FAQ, Product, Organization, and more.

Minify or beautify CSS code client-side. Reports byte savings.

Strip comments and whitespace from JavaScript code. Runs entirely in your browser.

Validate sitemap.xml structure: required tags, lastmod format, changefreq values, and URL count.

Generate a valid sitemap.xml from a list of URLs with optional lastmod, changefreq, and priority.

Build Cache-Control HTTP headers by selecting directives. Copy-ready output with inline explanations.

Paste HTML and visualize the H1–H6 heading hierarchy. Flags missing H1, duplicate H1, and skipped levels.

Analyze keyword frequency in text. Stop-word filtering, density percentage, and CSV export.

Interactive reference for LCP, CLS, INP, FID, FCP, and TTFB — thresholds, diagnosis tips, and fix priorities at a glance.

Paste HTML and instantly list all images with missing, empty, or suspiciously short alt attributes.

Enter a URL and trace its full redirect chain — every hop, status code, and final destination displayed step by step.

Paste a robots.txt file and test whether a given URL is allowed or blocked for any user-agent.