SEO Tools
12 tools
Build, inspect, and validate the SEO building blocks — meta tags, schema, sitemaps, robots, and OG previews.
Meta Tag Generator
Build a complete set of HTML meta tags — basic SEO, Open Graph, Twitter Cards, viewport — with character-count warnings.
SERP Snippet Preview
Preview how your title, URL, and meta description render in Google search results — desktop and mobile.
hreflang Generator
Build the hreflang link tag set for multilingual or multi-regional sites with BCP 47 validation.
Readability Score
Score your content with six readability formulas — Flesch, Gunning Fog, SMOG, Coleman-Liau, ARI.
Keyword Density Analyzer
Analyze 1-, 2-, and 3-word phrase frequency and density in your content with stopword filtering.
Robots.txt Generator
Build a valid robots.txt visually with user-agent groups, allow/disallow rules, and sitemap URLs.
Robots.txt Tester
Test which URLs your robots.txt allows or blocks. Multi-path testing with rule-match explanation.
Sitemap.xml Generator
Generate a valid sitemap.xml from a list of URLs with bulk lastmod, changefreq, and priority controls.
Sitemap.xml Validator
Validate a sitemap.xml against the protocol — URL format, lastmod, priority, changefreq, limits.
JSON-LD Schema Generator
Generate JSON-LD for 10 schema types — Article, Product, FAQ, HowTo, Recipe, LocalBusiness, Event, and more.
Meta Tag Inspector
Inspect any page's meta tags grouped by Basic, Open Graph, Twitter, Links. Flags missing critical tags.
Open Graph Preview
Preview how your URL renders as a social-share card on Facebook/LinkedIn, X (Twitter), and chat apps.
About SEO Tools
SEO Tools covers the building blocks of search-engine optimization that you can inspect, build, and validate without crawling the web. Meta tag generators and inspectors, JSON-LD schema builders for every common content type, robots.txt and sitemap.xml authoring and validation, hreflang management for multilingual sites, Open Graph and SERP snippet previews, plus content quality checks like readability scoring and keyword density analysis. Twelve tools that together cover ~90% of the on-page SEO work a site owner does.
What we deliberately don't ship here is anything that requires server-side crawling: rank trackers, backlink checkers, Lighthouse audits. Those need a backend, which conflicts with our zero-server promise. Our tools work on pasted HTML or pure form input — and the few that fetch URLs do so with a best-effort browser fetch that falls back to paste mode when CORS blocks. Everything runs in your browser; no data ever reaches a server.
Frequently asked questions
Can these tools crawl my whole site?+
No. Crawling requires a server with no CORS restrictions. Our SEO tools work on one page at a time — paste the HTML, or let the tool try fetching a single URL (which works for same-origin and CORS-friendly sites). For full-site audits, use a dedicated crawler like Screaming Frog or Sitebulb.
Why do some URL fetches fail with 'CORS blocked'?+
Most websites set HTTP headers that prevent other websites' JavaScript from reading their pages. This is a security feature, not a bug. When the tool can't fetch a URL, it shows a clear message asking you to paste the HTML directly (right-click → View Page Source → Copy All).
Does my pasted HTML or content stay private?+
Yes. All parsing, scoring, generation, and validation happens in your browser. No tool in this category sends your input to a server. Confirm in DevTools Network tab if you're skeptical.
Are the readability scores reliable?+
The formulas (Flesch, Gunning Fog, SMOG, Coleman-Liau, ARI) are well-established and have been used by content teams for decades. They're approximations of reading difficulty based on sentence and word length — useful as a relative measure to compare drafts, not as an absolute oracle of how readable something feels.
Will Google penalize me for the wrong schema markup?+
Google ignores schema it doesn't understand, so wrong markup is usually neutral rather than penalized. The risk is the opposite — missing required fields means Google won't generate rich results from your data. Use the validator output here plus Google's Rich Results Test for ground truth.