WEBSITE REPORT

zotero.org

Latest V2 analysis: 2026-09-12 · 02:05

Overall score70/100

Run fresh analysis Visit website Guardar sitio

Score model: score-2026-09-10-fAnalysis: 0.39.4.149Score integrity OK

SEO44Critical4/9 passed · 5 failed

Technical81Good17/21 passed · 4 failed

Performance83Good5/6 passed · 1 failed

Security73Needs work8/11 passed · 3 failed

Mobile67Needs work4/6 passed · 2 failed

SEO · 4/9 passed · 5 failed

Failed: Exactly one H1 · Canonical · Image alt coverage · Structured data · Open Graph metadata

Technical · 17/21 passed · 4 failed

Failed: Canonical present · Canonical matches host · Single H1 · Cache policy declared

Performance · 5/6 passed · 1 failed

Failed: Image dimensions >= 80%

Security · 8/11 passed · 3 failed

Failed: MIME sniffing protection · Referrer Policy · Permissions Policy

Mobile · 4/6 passed · 2 failed

Failed: Responsive viewport · Responsive image markup

Category scores are calculated directly from the individual checks: passed divided by all rated checks. Unrated or not-applicable checks are shown separately and are not counted as passed.

GOOGLE SAFE BROWSING

Reputación de seguridad

Comprueba el sitio frente a amenazas conocidas de Google Safe Browsing.

La comprobación de Safe Browsing está en cola.

APIV5

Coincidencias0

Comprobado—

La comprobación de Safe Browsing está en cola.

Website preview

Open in new tab

DesktopWide browser viewport

https://zotero.org/

MobileNarrow smartphone viewport

Screenshot is being created …

REPORT SUMMARY

What matters most

Critical findings are shown before improvements.

Critical issues1

Improvements9

Strongest areaPerformance 83/100

Needs most attentionSEO 44/100

HTTP status200

Load time1062 ms

Page size44 KB

H1 headings2

Images9

Missing alt6

Search Engine Optimization

Title tagZotero | Your personal research assistant

Meta descriptionZotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.

CanonicalNot found

Languageen

Text / HTML ratio5.2 %

Headings

H1: 2Your personalresearch assistant · Meet Zotero.

H2: 7Collect with a click. · Organize your way. · Cite in style.

H3: 0

H4: 0

H5: 0

H6: 0

Keyword cloud

zotero 13research 5any 4need 3create 3bibliography 3organize 3zoterobib 2just 2quick 2easy 2use 2collect 2cite 2share 2

Search Preview

https://zotero.org/

Zotero | Your personal research assistant

Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.

Title length41 characters

Description length91 characters

Image alt coverage33%

Keyword Consistency

KeywordCantidadTitleDescriptionH1

zotero13✓✓✓

research5✓✓✓

any4———

need3———

create3———

bibliography3———

organize3—✓—

zoterobib2———

SEO e indexabilidad

¿Pueden los motores de búsqueda entender e indexar esta página?

Indexable

TitleBien41 caracteres

Meta descripciónBien91 caracteres

Indexación de robotsBienIndexación permitida

CanonicalRevisarFalta

Jerarquía de encabezadosBienOrden lógico

H1 principalRevisar2 encontrado

IdiomaBienen

Datos estructuradosRevisarNo detectado

Meta robotsNo restrictive directive

GooglebotNo separate directive

X-Robots-TagNot set

Hreflang0 entradas

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Prioritized actionsWhat should be fixed first

Exact affected URLsWhich pages are actually affected

Technical root causeWhy an issue occurs

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Usability & Technologies

robots.txtFound

XML SitemapFound

FaviconFound

Compressiongzip

Doctypehtml

EncodingDetected

Open GraphNot detected

Twitter CardsNot detected

Schema / JSON-LDDetected

Iframes0

Embedded objects0

Server, DNS & TLS

IPv434.224.104.69, 32.196.46.51, 3.93.208.160

IPv6Not detected

Nameserversns-496.awsdns-62.com, ns-635.awsdns-15.net, ns-1395.awsdns-46.org, ns-1678.awsdns-17.co.uk

Mail servers10 mail.zotero.org

TLS certificateAvailable

TLS issuerAmazon

TLS expires2026-10-31T23:59:59+00:00

Security & HTTPS

Transport encryption, certificate health, browser security headers and insecure resources.

73/100

✓HTTPS

Website is served over HTTPS.

✓HTTP → HTTPS

HTTP requests are redirected to HTTPS.

✓TLS certificate

Certificate is available and valid.

✓Mixed content

No insecure HTTP resources detected.

✓HSTS

Strict-Transport-Security is enabled.

✓Content Security Policy

A Content-Security-Policy header is present.

!MIME sniffing

Send X-Content-Type-Options: nosniff.

✓Frame protection

Frame embedding is restricted.

!Referrer Policy

Add an appropriate Referrer-Policy header.

!Permissions Policy

Restrict unnecessary browser features with Permissions-Policy.

TLS issuerAmazon

TLS expires2026-10-31T23:59:59+00:00

Días restantes49

Mixed resources0

TECHNICAL & INFRASTRUCTURE

Delivery, DNS & Server

How the website is delivered before content and SEO are considered.

91/100

HTTP status200

Response time1062 ms

HTML size44 KB

CompressionGzip compression

IPv434.224.104.69, 32.196.46.51

IPv6Not detected

Nameservers4

Mail servers1

Redirects2

HTTP → HTTPSYes

WWW resolvesYes

TLSAvailable

Content-Typetext/html; charset=UTF-8

Doctypehtml

Character encodingDetected

Languageen

Server headerApache

X-Powered-ByNot disclosed

Cache-ControlNot sent

Primary IP34.224.104.69

Redirect Analysis

HTTP 301http://zotero.org/ → https://zotero.org:443/

HTTP 301https://zotero.org:443/ → https://www.zotero.org/

HTTP 200https://www.zotero.org/

DOMAIN & URL

Domain & URL Analysis

Local URL-quality checks using data already collected by the core analysis.

Current URLhttps://zotero.org/

HTTPSPassed

URL length19 characters

Domain length10 characters

Domain label length6 characters

Hyphen in domainNone

UnderscorePassed

IDN / PunycodeNo

Subdomains0

WWW hostNo

Canonical hostUnavailable

Redirect target hostPassed

SEO-friendly URLPassed

404 Error Page

The 404-page check is running asynchronously or unavailable.

DOMAIN PROTECTION

Typo Domains

Common typo variants are generated locally and DNS-tested asynchronously. A missing DNS record is not proof that a domain is available to register.

Typo-domain check is running asynchronously or unavailable.

Domain Registration (RDAP)

RDAP data unavailable for this domain. The check runs asynchronously and does not delay the core report.

PageSpeed Insights

Mobile and desktop Lighthouse performance, measured asynchronously.

Deferred during crawler run

Enlaces y rastreo

Análisis de enlaces

Up to 12 links are checked asynchronously after the core report.

Enlaces internos25

Dominios externos6

Follow links34

NoFollow links0

Enlaces sin texto0

Rotos en la muestra0 / 0

Rastreabilidad

robots.txtFound

Meta robotsNo restrictive directive

IndexingIndexable

CanonicalMissing

Canonical hostReview

XML sitemapFound

Hreflang entries0

Muestra de enlaces

DestinoTipoRelTexto del enlace

https://zotero.org/InternalfollowZotero

https://zotero.org/groups/InternalfollowGroups

https://zotero.org/support/InternalfollowDocumentation

https://forums.zotero.org/discussionsExternalfollowForums

https://zotero.org/getinvolvedInternalfollowGet Involved

https://zotero.org/user/login/InternalfollowLog In

https://zotero.org/user/register/InternalfollowSign Up

https://zotero.org/storageInternalfollowUpgrade Storage

https://zotero.org/Internalfollow—

https://zotero.org/groups/InternalfollowGroups

https://zotero.org/support/InternalfollowDocumentation

https://forums.zotero.org/discussionsExternalfollowForums

https://zotero.org/getinvolvedInternalfollowGet Involved

https://zotero.org/user/login/InternalfollowLog In

https://zotero.org/storageInternalfollowUpgrade Storage

https://zbib.orgExternalfollowZoteroBib Just need to create a quick bibliography?

https://zotero.org/downloadInternalfollowDownload

https://apps.apple.com/us/app/zotero/id1513554812ExternalfollowiOS

https://zotero.org/download/androidInternalfollowAndroid

https://zbib.org/ExternalfollowZoteroBib

SEO

✓Title presentCorrecto

✓Title lengthCorrecto

✓Meta descriptionCorrecto

×Exactly one H1Requiere atención

✓Heading hierarchyCorrecto

×CanonicalRequiere atención

×Image alt coverageRequiere atención

×Structured dataRequiere atención

×Open Graph metadataRequiere atención

Technical

✓HTTP status 2xxCorrecto

✓HTML content typeCorrecto

✓HTML languageCorrecto

✓Character encodingCorrecto

✓HTML doctypeCorrecto

✓Robots allows indexingCorrecto

✓robots.txtCorrecto

✓XML sitemapCorrecto

✓FaviconCorrecto

✓Internal links presentCorrecto

✓DNS address presentCorrecto

✓No redirect loopCorrecto

✓Short redirect chainCorrecto

×Canonical presentRequiere atención

×Canonical matches hostRequiere atención

✓Heading hierarchy validCorrecto

×Single H1Requiere atención

×Cache policy declaredRequiere atención

✓No duplicate scriptsCorrecto

✓No duplicate stylesheetsCorrecto

✓No external resources without SRICorrecto

Performance

✓Response under 1.5sCorrecto

✓HTML under 250 KBCorrecto

✓Compression enabledCorrecto

✓Parser blocking scripts <= 2Correcto

✓Blocking stylesheets <= 4Correcto

×Image dimensions >= 80%Requiere atención

Security

✓HTTPSCorrecto

✓HTTP redirects to HTTPSCorrecto

✓Valid TLS certificateCorrecto

✓No mixed contentCorrecto

✓HSTSCorrecto

✓Content Security PolicyCorrecto

×MIME sniffing protectionRequiere atención

✓Frame protectionCorrecto

×Referrer PolicyRequiere atención

×Permissions PolicyRequiere atención

✓Email privacyCorrecto

Mobile

✓Viewport meta tagCorrecto

×Responsive viewportRequiere atención

✓No embedded objectsCorrecto

✓No fixed-width layout hintsCorrecto

✓No tiny-control hintsCorrecto

×Responsive image markupRequiere atención

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