Technical SEO tools cover crawl diagnostics, metadata production, page quality checks, and website operations that affect discovery and user experience.
Every tool in this section is free and available to use right now — directly in your browser or through a live URL check. Some checks depend on browser support, public-URL access, or third-party data availability.
Every listed tool is available to use for free — in your browser or through a live URL check. No signup, no paywall.
This section is the hands-on technical layer of an SEO project: the checks that confirm what a crawler can actually fetch and render, the generators that produce the files and tags a search engine reads, and the share-preview and tracking utilities that decide how a link behaves once it leaves your site. The sixteen tools here split into two practical groups. The live-fetch checks (Website Checker, Website SEO Score Checker, Page Speed Test, Mobile Friendly Test, Website Page Size Checker, Online Ping Website Tool, Robots.txt Tester, GEO Checker) tell you the current state of a real URL. The producers (XML Sitemap Generator, Robots.txt Generator, Open Graph Generator, Twitter Card Generator, UTM Builder, URL Slug Generator) hand you clean, copy-ready output for the things you need to fix or set up.
A realistic way to chain them: run the Website Checker on a page that is not getting indexed to read its title, canonical, headings, and robots directives in one pass. If the Robots.txt Tester shows the URL is blocked for Googlebot, fix the rule with the Robots.txt Generator and confirm the page is in your XML Sitemap Generator output. Before you announce the page, paste its HTML into the Open Graph Checker so the share card is not blank, generate any missing tags with the Open Graph Generator or Twitter Card Generator, and wrap the outbound campaign link with the UTM Builder so the visits show up correctly in analytics. That sequence moves from diagnosis to a deployable fix without leaving the section.
It is worth being clear about what the numbers do and do not mean. The Website SEO Score Checker fetches the URL you give it and runs nineteen weighted checks against the HTML the server returns, so it flags common gaps like a missing description or thin heading structure; it does not execute JavaScript, measure field Core Web Vitals from real users, or predict a ranking position. The Page Speed Test works differently: it calls Google PageSpeed Insights, which runs a Lighthouse audit on the live URL and adds Chrome UX Report field data when Google has enough real-user data, so read those numbers as Google's own Lighthouse result rather than a markup heuristic or an official ranking score. The Online Ping Website Tool and Website Page Size Checker report what one request returned at that moment, not a sustained average. The Adsense Calculator multiplies the traffic, CTR, and CPC you supply, so it is an estimate that inherits your assumptions, not a forecast of earnings. Treat every score as a prioritization aid that tells you where to look, not a guarantee of outcome.
Who gets the most out of this section: site owners and small-team marketers verifying that a template change, redirect, or migration actually deployed; developers who need a valid robots.txt or sitemap without hand-writing XML; and content and social teams who want share previews and tracked campaign URLs to render correctly the first time. Because nothing here requires a login, install, or paid plan, it suits one-off troubleshooting as much as a repeatable pre-launch checklist.
A quick reference to every tool in this section, so you can pick the right one before you click through.
Use this section to connect research, diagnosis, and implementation rather than treating metrics in isolation.
Both fetch a live URL — neither works on pasted HTML — so the difference is what they hand back. The Website Checker audits crawler-facing signals (metadata, headings, links, schema, and robots directives) and reports them as they exist on the server right now, which is what you want when you need to read the raw state of a page. The Website SEO Score Checker runs nineteen weighted checks over the same response and condenses them into a 0–100 score, a grade, and a priority-ordered fix list. Use the first to see the signals themselves, the second when you want a triage score that tells you what to fix first.
They work differently. The Page Speed Test calls Google PageSpeed Insights directly: it runs a Lighthouse lab audit on the URL and, when Google has enough real-user data, also shows Chrome UX Report field data — so its scores are Google's own, though a lab run still varies a few points between tests. The Mobile Friendly Test is a heuristic check of the markup it receives: it looks at viewport tags, responsive CSS links, and fixed-width layout clues rather than rendering the page, so it flags likely problems quickly and should not be read as an official Google result. Confirm anything critical against Google's own field data before you treat it as final.
No. It estimates daily, monthly, and annual figures by multiplying the traffic, click-through rate, and cost-per-click values you enter. The output is only as good as those inputs, so it is best used for comparing scenarios — what changes if CTR rises, or if traffic doubles — not as a promise of actual earnings, which depend on niche, advertiser demand, and policy compliance.
Use the Generator to build a robots.txt with the allow, disallow, crawl-delay, and sitemap lines you need, then deploy it to your site root. Use the Tester to paste a robots.txt, enter a specific URL and crawler, and confirm whether that page is allowed or blocked along with the exact rule that matched. Testing first prevents the common mistake of accidentally blocking a section you meant to keep crawlable.
They make a correct preview far more likely, but the final render is controlled by each platform. The Open Graph Checker tells you which social tags your HTML is missing, and the Open Graph Generator and Twitter Card Generator produce the tags to add. Some platforms cache previews, so after you deploy the tags you may need to use that platform's own debugger to clear the old cache before the new card appears.
Run them after any change that affects crawling or presentation — template edits, redirects, a robots.txt or canonical update, a migration, or before publishing a high-value page or campaign link. For pages that matter most, a periodic re-check catches regressions that slip in through later deployments. Live results reflect the moment of the request, so re-test after each deploy to confirm the change actually went out.
HighSEOTools documents how live fetches, provider data, and research-only pages are handled across the site.