SEO & Webmaster topic guide
Crawl, headers, and performance
Inspect HTTP headers, security headers, keyword density, and Core Web Vitals concepts for healthier pages.
Topic guides
Browse focused guides that compare related tools and link to the best starting point for your task.
- Meta tags and previewsGenerate and preview title tags, meta descriptions, Open Graph, and social cards before you publish a page.
- Sitemap and robots.txtBuild XML sitemaps and robots.txt files, then validate syntax before submitting to search engines.
- Schema and structured dataGenerate JSON-LD schema markup and validate structured data before publishing rich results.
- Technical SEO auditCheck redirects, canonical tags, broken links, headings, and HTTP status before or after a site launch.
- Crawl, headers, and performanceInspect HTTP headers, security headers, keyword density, and Core Web Vitals concepts for healthier pages.
- Campaign tracking and URLsBuild UTM campaign links and clean URL slugs for analytics-ready marketing pages.
Tools in this guide
Overview
Crawlers and browsers rely on HTTP headers for caching, security, and indexing hints. HTTP Header Checker and Security Headers Checker show response headers for URLs you test. Keyword Density Checker helps spot over-optimization in draft copy, and Core Web Vitals Explainer translates LCP, INP, and CLS into plain language.
Header checks complement—not replace—server configuration review. A missing Content-Security-Policy or HSTS header may require changes in Cloudflare, nginx, or your host panel.
Performance work should follow measuring real URLs in Chrome DevTools or PageSpeed Insights; the explainer tool teaches metrics before you optimize.
How to choose
- General response headers → HTTP Header Checker.
- Security header checklist → Security Headers Checker.
- On-page keyword balance → Keyword Density Checker.
- Learn CWV metrics → Core Web Vitals Explainer.
- International hreflang tags → Hreflang Generator.
Frequently asked questions
Are URLs fetched from Utilnivo servers?
Yes for header and status tools—they request the URL you enter so you see server responses.
What is a good keyword density?
There is no fixed ideal; write for readers first and use the checker to spot accidental repetition.
Does the CWV tool measure my site?
The explainer describes metrics; use lab or field tools for live scores.
Related workflows
These multi-step guides chain tools from this category for common jobs.