Home/Free SEO tools/Technical SEO Checker
Free tool · step 01 of 04 · Reachable & indexable

Technical SEO CheckerEvery technical signal, on one page.

One URL, checked for indexability, canonicals, hreflang, schema, links, speed and security, read the way a search engine reads it.

Last reviewed · 1 Oct 20267 primary sources →Kalenux engineering
https://

HTTP statusIndexing directivesCanonical targetsHreflang clustersStructured dataSitemaps & robots.txt
technical seo checker · example.com
58/ 100
1 to fix · 3 to review
2 passed · 3 warnings · 1 failed
Status codes1,284 URLs · 12 errorsWARN
Indexabilitynoindex on /blog/tag/*FAIL
Canonicalsall resolve to 200PASS
Hreflang3 missing return linksWARN
Structured datavalid JSON-LDPASS
Redirects2 chains foundWARN
illustrative result
fetched as crawler · 0.4s
6checks run together
3common faults explained
01step in the fix order
0signups needed
everything a crawler checks, at once

One URL, six systems checked.

Specialist tools each look at one area. This one reads them all on a single page, so you can see which area needs attention first. Illustrative result:

Access100robots.txt, status, redirects
Indexing62noindex, canonical, X-Robots-Tag
Signals84title, description, headings, hreflang
Links70internal, outbound, anchors
Speed41LCP, INP, CLS
Security88HTTPS, HSTS, mixed content
the fetch, step by step

It reads your page the way a crawler does.

Five stages, in order. A failure at any stage hides everything after it, so the checker reports the earliest one first.

  1. 01 →DNSDoes the host resolve?
  2. 02 →TLSIs the certificate valid?
  3. 03 →HTTPStatus, redirects, response headers
  4. 04 →HTMLHead tags, links, structured data
  5. 05RenderWhat the page looks like once scripts have run
what to fix first

Four tiers, in the right order.

Fixing speed on a page that's noindexed is wasted work. Each tier links to the specialist tool for a deeper check.

TIER 1 · FIX TODAYBlockersThe page can't be crawled or indexed5xx, robots.txt blocks, stray noindexIndexability Checker →
TIER 2 · FIX THIS WEEKUnderstandingIt's indexed, but read wronglyCanonicals, titles, hreflangCanonical Checker →Meta Tag Checker →Hreflang Checker →
TIER 3 · FIX THIS MONTHConnectionsValue leaks between pagesBroken links, redirect chains, sitemapsBroken Link Checker →Sitemap Validator →
TIER 4 · KEEP IMPROVINGSpeedRanks, but loses visitorsCore Web VitalsPageSpeed Test →
also on the list

Secure is part of technical.

HTTPS is a ranking signal and a trust signal. The checker confirms all three basics.

HTTPS & security reference →
✓HTTPSEvery URL served over TLS, with HTTP redirecting to it
✓HSTSThe Strict-Transport-Security header, so browsers never try HTTP
✓No mixed contentNo images, scripts or styles loaded over HTTP
A page check is a sample. The audit is the whole site.Run it on your homepage, a category page and a product page to spot problems in each template. Then run the full audit to count every affected URL.
Technical SEO referenceRun the full audit →
in depth · 7 primary sources

What Google documents about each technical check.

What the search engines document about each check this tool runs, with every claim linked to its source.

01The three technical requirements

Google’s technical requirements for eligibility are short: Googlebot isn’t blocked, the page returns HTTP 200, and it has indexable content [1].

Everything else the checker looks at affects how well a page is understood and shown, not whether it can appear at all [2].

KEY FACTMeeting the technical requirements makes a page eligible. It doesn’t guarantee it will be indexed [1].

02Mobile is the version that counts

Google primarily uses the mobile version of a page for indexing and ranking, so content and markup missing on mobile may not count [3].

03HTTPS and structured data

Google confirmed HTTPS as a lightweight ranking signal in 2014 [4].

Structured data must describe content visible on the page and follow Google’s guidelines to be eligible for rich results [5].

04Titles and speed

The <title> element is a main source for the title link Google shows [6].

Core Web Vitals are used by ranking systems, though good scores alone don’t guarantee top positions [7].

References

  1. [1]Technical requirements (Search Essentials) · Google Search Centraldevelopers.google.com/search/docs/essentials/technical
  2. [2]In-depth guide to how Google Search works · Google Search Centraldevelopers.google.com/search/docs/fundamentals/how-search-works
  3. [3]Mobile-first indexing best practices · Google Search Centraldevelopers.google.com/search/docs/crawling-indexing/mobile/mobile-sites-mobile-first-indexing
  4. [4]HTTPS as a ranking signal · Google Search Central Blog, 2014developers.google.com/search/blog/2014/08/https-as-ranking-signal
  5. [5]General structured data guidelines · Google Search Centraldevelopers.google.com/search/docs/appearance/structured-data/sd-policies
  6. [6]Influencing your title links in search results · Google Search Centraldevelopers.google.com/search/docs/appearance/title-link
  7. [7]Understanding Core Web Vitals and Google search results · Google Search Centraldevelopers.google.com/search/docs/appearance/core-web-vitals
CITE THIS PAGEKalenux. (2026). Technical SEO checker: a full-page technical scan. Kalenux SEO Guide. Last reviewed 1 Oct 2026. kalenux.com.tr/seo-technical-seo-checker
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