SEO Tools

Utility369's SEO Tools are 26 browser-based utilities that cover the technical side of shipping a page, meta tags, sitemaps, structured data, keyword checks, and link audits, the kind of on-page details that are easy to get wrong by hand and tedious to check one at a time. Every tool works instantly on whatever URL, HTML snippet, or text is pasted in, with no crawler, no account, and no data sent anywhere but the browser it's opened in, and no waiting on a scan to finish.

Most technical SEO mistakes are small and easy to miss without a dedicated checker, a title tag that gets truncated in search results, a missing canonical tag on a page with several URL variants, a robots.txt rule that accidentally blocks a section of the site, or JSON-LD that's almost valid but fails Google's Rich Results Test on a single misplaced comma. Running a page through the relevant tool here before it ships catches most of these before they turn into a ranking or indexing problem.

Meta tags and social previews

The Meta Tag Generator and Meta Tag Analyzer cover the title, description, and viewport basics every page needs, while the Meta Description Checker and SERP Title Length Checker catch text that Google would truncate in results. The SERP Snippet Preview shows how a page will actually look in search results before it ships, and the Open Graph Generator and Twitter Card Generator build the tags that control how a link looks when it's shared on social platforms.

Sitemaps and crawl control

The Robots.txt Generator and Robots.txt Tester build and validate crawl rules before they go live, and the XML Sitemap Generator and Sitemap.xml Viewer handle building and inspecting a sitemap. The Canonical Tag Generator and Hreflang Tag Generator round this group out for sites dealing with duplicate content or multiple language versions of the same page.

Structured data

The Schema Markup Generator builds ready-to-use JSON-LD for articles, products, FAQs, local businesses, and recipes, and the Schema Validator checks that JSON-LD syntax is valid before it's pasted into a page, catching the kind of typo that would otherwise quietly break a rich-result eligibility check without throwing any visible error on the page itself.

Keywords and content checks

The Keyword Research Tool discovers real-time Google search suggestions, questions, and long-tail topics. The Keyword Density Checker and Keyword Extractor analyze how a target term is actually used across a block of content, and the Keyword in Title Checker confirms it shows up where it matters most. The Heading Structure Analyzer checks a page's H1 through H6 hierarchy for missing or skipped levels, and the Alt Text Checker scans pasted HTML for images missing alt text.

Links and URLs

The UTM URL Builder builds campaign-tracked links, and the URL Structure Parser breaks any URL down into its protocol, host, path, and query parameters. The Internal vs External Link Counter, Broken Link Syntax Checker, and Nofollow/Sponsored Tag Finder all work by scanning pasted HTML, useful for a quick link audit without needing a full crawler or third-party auditing subscription.

Picking the right tool

A pre-publish checklist usually starts with the meta tag and SERP preview tools, moves through the schema and heading checks, and ends with a sitemap or robots.txt update once the page is live. For an existing page that isn't performing, the keyword and link tools are the better starting point, they work directly off pasted HTML, so no crawler or site access is needed to run a quick technical check. Multi-language or multi-region sites should also run the Hreflang Tag Generator alongside the Canonical Tag Generator, since the two are commonly required together to avoid search engines treating regional variants as duplicate content.