SEO Audit Tool - Free Technical SEO & PageSpeed Checks

// check reference

244 checks across eight areas.

Every area below is defined, explained and tied to the public documentation its thresholds come from. Each check has a stable ID you can reference.

Crawlability 38 Indexing 34 On-page 42 Performance 36 Structured data 24 International 22 Links 28 Security 20

CITE THIS PAGEKalenux. (2026). Kalenux SEO Audit: check reference, v2.4. Retrieved from https://kalenux.com.tr/seo-audit/checks

VERSION2.4 · 244 checksLAST REVIEWED28 Sep 2026METHODthresholds from linked sources

01 · CRW# link

Crawlability

38 checks

Definition. Whether search engines can discover and fetch every URL on your site.

Why it matters. If a crawler cannot reach a page, or wastes its budget on redirects and errors, that page cannot rank: no matter how good its content is.

REFERENCES[1]Robots.txt introduction: Google Search Central [2]Build and submit a sitemap: Google Search Central [3]Redirects and Google Search [4]How HTTP status codes affect Google Search

IDCHECKWHAT WE FLAGTHRESHOLD

CRW-004HTTP statusPages returning 4xx or 5xx that are linked internallyAny linked URL ≠ 200

CRW-011Redirect chainsRedirects that pass through more than one hop> 1 hop (Googlebot follows up to 10)

CRW-015Redirect loopsRedirects that never resolve to a final URLAny loop

CRW-021robots.txtDisallow rules blocking important templates, CSS or JSBlocked resource needed to render

CRW-024robots.txt sizeFile larger than Google processes> 500 KiB

CRW-030XML sitemapSitemaps listing non-200, redirected or noindex URLs; oversized files> 50,000 URLs or 50 MB per file

Showing 6 of 38 crawlability checks. Thresholds marked “Kalenux rule” are our defaults, not search-engine requirements.

02 · IDX# link

Indexing

34 checks

Definition. Whether fetched pages are eligible to be stored in the search index, and which version is chosen.

Why it matters. Accidental noindex tags and conflicting canonicals silently remove pages from search. Duplicates split ranking signals between near-identical URLs.

REFERENCES[1]Block search indexing with noindex [2]How to specify a canonical URL [3]Robots meta tag and X-Robots-Tag specifications

IDCHECKWHAT WE FLAGTHRESHOLD

IDX-002noindex directiveIndexable templates carrying meta robots or X-Robots-Tag noindexAny noindex on a page in the sitemap

IDX-007Canonical targetCanonical pointing to a non-200, redirected or noindex URLTarget ≠ indexable 200

IDX-009Canonical conflictsDifferent canonicals declared in HTML and HTTP headerMismatch

IDX-014Duplicate contentPages with near-identical main content and no canonicalSimilarity ≥ 90%

IDX-019Orphan pagesPages in the sitemap with no internal links pointing to them0 inbound internal links

IDX-022Parameter duplicatesTracking or sort parameters creating indexable copiesParameter URL without canonical

Showing 6 of 34 indexing checks. Thresholds marked “Kalenux rule” are our defaults, not search-engine requirements.

03 · ONP# link

On-page

42 checks

Definition. The signals inside each page that tell search engines and users what it is about.

Why it matters. Titles and descriptions become your search result. Missing, duplicated or truncated ones lower click-through even when rankings are good.

REFERENCES[1]Influencing your title links in search results [2]Control your snippets in search results [3]Creating helpful, reliable, people-first content

IDCHECKWHAT WE FLAGTHRESHOLD

ONP-001Title presentPages with no <title> elementMissing or empty

ONP-003Title lengthTitles likely to be truncated in results> 60 characters (Kalenux rule)

ONP-005Duplicate titlesThe same title used on multiple URLs≥ 2 pages

ONP-010Meta descriptionMissing or duplicated descriptionsMissing or ≥ 2 pages

ONP-016Heading structurePages with no H1 or several competing H1s0 or > 1 H1

ONP-024Thin contentIndexable pages with very little main content< 200 words (Kalenux rule)

Showing 6 of 42 on-page checks. Thresholds marked “Kalenux rule” are our defaults, not search-engine requirements.

04 · PRF# link

Performance

36 checks

Definition. How quickly pages load and respond, measured with PageSpeed and Core Web Vitals.

Why it matters. Core Web Vitals are part of Google’s page experience signals, and slow pages lose visitors before they convert.

REFERENCES[1]Web Vitals: web.dev [2]Understanding Core Web Vitals and Google search results [3]Largest Contentful Paint (LCP): web.dev [4]Interaction to Next Paint (INP): web.dev

IDCHECKWHAT WE FLAGTHRESHOLD

PRF-001Largest Contentful PaintTime until the main content is visible> 2.5 s at p75

PRF-002Interaction to Next PaintDelay between a user action and the next frame> 200 ms at p75

PRF-003Cumulative Layout ShiftUnexpected movement of visible content> 0.1 at p75

PRF-010Image weightImages far larger than their displayed size> 150 KB or 2× display size

PRF-014Render-blocking resourcesCSS or scripts delaying first renderAny blocking resource in <head>

PRF-021Caching headersStatic assets served without long-lived cachingmax-age < 7 days

Showing 6 of 36 performance checks. Thresholds marked “Kalenux rule” are our defaults, not search-engine requirements.

05 · STD# link

Structured data

24 checks

Definition. Machine-readable markup that describes a page’s entities: products, articles, organisations, FAQs.

Why it matters. Valid structured data makes pages eligible for rich results. Invalid markup is ignored, and markup that misrepresents content can lead to manual action.

REFERENCES[1]Introduction to structured data markup [2]General structured data guidelines [3]Schema.org vocabulary

IDCHECKWHAT WE FLAGTHRESHOLD

STD-001JSON-LD parseBlocks that are not valid JSONAny parse error

STD-004Required propertiesTypes missing properties needed for rich resultsAny required property missing

STD-008Type–content matchMarkup describing content not visible on the pageMismatch

STD-012OrganisationSite with no Organization markup on the home pageMissing

STD-015BreadcrumbsDeep pages without BreadcrumbList markupDepth ≥ 3 and missing

Showing 5 of 24 structured data checks. Thresholds marked “Kalenux rule” are our defaults, not search-engine requirements.

06 · INT# link

International

22 checks

Definition. How multilingual and multi-region versions of a page declare each other.

Why it matters. Broken hreflang shows users the wrong language version and lets translations compete with each other in the same results.

REFERENCES[1]Tell Google about localized versions of your page [2]Managing multi-regional and multilingual sites

IDCHECKWHAT WE FLAGTHRESHOLD

INT-001Return linksAlternates that do not link back to the pageAny non-reciprocal pair

INT-004Language codesInvalid ISO 639-1 language or ISO 3166-1 region codesAny invalid code

INT-007x-defaultLanguage selector or fallback page not declaredMissing on multilingual sets

INT-010Alternate target statushreflang pointing to non-200 or non-canonical URLsTarget ≠ indexable 200

INT-013html langPage language attribute missing or contradicting hreflangMissing or mismatch

Showing 5 of 22 international checks. Thresholds marked “Kalenux rule” are our defaults, not search-engine requirements.

07 · LNK# link

Links

28 checks

Definition. The internal and external links that connect your pages and pass context between them.

Why it matters. Links are how crawlers find pages and how importance flows through a site. Broken or uncrawlable links waste both.

REFERENCES[1]Link best practices for Google [2]Qualify your outbound links (rel attributes)

IDCHECKWHAT WE FLAGTHRESHOLD

LNK-001Broken internal linksLinks pointing to 4xx or 5xx URLsAny

LNK-005Crawlable linksNavigation built without <a href> elementsLink not in an <a href>

LNK-009Click depthImportant pages buried deep in the site> 3 clicks from home

LNK-014Anchor textGeneric anchors such as “click here” or empty anchorsGeneric or empty

LNK-018Broken external linksOutbound links that no longer resolveAny 4xx / 5xx / DNS failure

Showing 5 of 28 links checks. Thresholds marked “Kalenux rule” are our defaults, not search-engine requirements.

08 · SEC# link

Security

20 checks

Definition. Transport security and headers that protect visitors and signal a trustworthy site.

Why it matters. HTTPS is part of Google’s page experience, browsers warn on insecure pages, and missing headers leave users exposed.

REFERENCES[1]Strict-Transport-Security: MDN [2]Mixed content: MDN [3]Understanding page experience in Google Search

IDCHECKWHAT WE FLAGTHRESHOLD

SEC-001HTTPSPages served over plain HTTP or without redirect to HTTPSAny HTTP response

SEC-004Mixed contentHTTPS pages loading HTTP images, scripts or stylesAny insecure subresource

SEC-007CertificateExpired, invalid or soon-expiring TLS certificate< 14 days to expiry

SEC-010HSTSStrict-Transport-Security missing or short-livedMissing or max-age < 31,536,000

SEC-013Content type sniffingX-Content-Type-Options header missing≠ nosniff

Showing 5 of 20 security checks. Thresholds marked “Kalenux rule” are our defaults, not search-engine requirements.

Every fault on your site. In fix order.

From URL to fix list in four steps.

244 checks across eight areas.

Crawlability

Indexing

On-page

Performance

Structured data

International

Links

Security

Five causes. Not five thousand warnings.

Pay per audit. Nothing recurring.