Pubmed.ncbi.nlm.nih.gov - SEO Checker

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Overview of the SEO Check
Meta information
59% 
Page quality
94% 
Page structure
93% 
Link structure
85% 
Server
100% 
External factors
100% 
SEO Score
Response time
0.17 s
File size
41.20 kB
Words
508
Media files
5
Number of links
23 internal / 35 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
PubMed
The page title is too short. (73 pixels of 580 max pixel length) Optimize title
The page title is only one word.
There are no duplicate words in the title
Meta description
(Critically important)
PubMed® comprises more than 38 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.
The meta description is too long: 1381 pixels from max. 1000 pixels. Optimize description
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
https://pubmed.ncbi.nlm.nih.gov/
There is a valid canonical link specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en
Server location: United States of America
The following language is defined by HTML: en
Alternate/Hreflang Links
(Somewhat important)
There are no alternate links specified on this page.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
This page is hosted on a subdomain. Use a top level domain for better SEO results.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The charset encoding (UTF-8) is set correctly.
Doctype
(Nice to have)
The doctype HTML 5 is set correctly.
The doctype is placed at first in the HTML code.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
HandheldFriendlyTrue
MobileOptimized320
viewportwidth=device-width, initial-scale=1.0
ncbi_sg_optimize_idEmpty
theme-color#20558a
referrerorigin-when-cross-origin
ncbi_pinger_gtm_tracktrue
ncbi_apppubmed
ncbi_dbpubmed
ncbi_phidCF410001C669A6E500003111A16E44B4.1.m_1
ncbi_pinger_stat_urlhttps://pubmed.ncbi.nlm.nih.gov/stat
log_categoryliterature
ncbi_cost_centerpubmed
ncbi_pdidhome
log_oppage_view
descriptionPubMed® comprises more than 38 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.
keywordsPubMed, NIH, NLM, NCBI, National Institutes of Health, National Center for Biotechnology Information, National Library of Medicine, MEDLINE, Medical Journals, pub med, Journal Articles, Citation search
robotsindex,follow,noarchive
langen
twitter:domainpubmed.ncbi.nlm.nih.gov
twitter:cardsummary_large_image
twitter:titlePubMed
twitter:urlhttps://pubmed.ncbi.nlm.nih.gov/
twitter:descriptionPubMed® comprises more than 38 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.
twitter:imagehttps://cdn.ncbi.nlm.nih.gov/pubmed/persistent/pubmed-meta-image-v2.jpg
og:titlePubMed
og:urlhttps://pubmed.ncbi.nlm.nih.gov/
og:descriptionPubMed® comprises more than 38 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.
og:imagehttps://cdn.ncbi.nlm.nih.gov/pubmed/persistent/pubmed-meta-image-v2.jpg
og:image:secure_urlhttps://cdn.ncbi.nlm.nih.gov/pubmed/persistent/pubmed-meta-image-v2.jpg
og:typewebsite
og:site_namePubMed
X-UA-CompatibleIE=edge
charsetUTF-8

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Page quality

Content
(Critically important)
This page contains 508 words. That's ok.
27.8% of the text are stop words.
The page contains a listing, which indicates a good text layout.
8 paragraphs were found on this page.
The text content is perfect.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 13.94 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
A viewport "width=device-width, initial-scale=1.0" is provided.
At least one Apple touch icon is specified.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 10 tags for this page.
Image SEO
(Somewhat important)
Alt text (alternative text) is correctly used on all found images.
Social Networks
(Nice to have)
There are only a few social sharing widgets on the page. Make your website popular in social networks with social sharing widgets.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
This website uses HTTPS to protect privacy and integrity of the exchanged data.
All included files are also transferred via HTTPS.

Media list

URLAlt attributeTitle
...eutils/uswds/img/favicons/favicon-57.pngU.S. flag
...gov/coreutils/uswds/img/icon-dot-gov.svgDot gov
...h.gov/coreutils/uswds/img/icon-https.svgHttps
.../coreutils/nwds/img/logos/AgencyLogo.svgNIH NLM Logo
...277210/core/images/pubmed-logo-white.svgpubmed logo

Page structure

H1 heading
(Critically important)
Home Page
The H1 heading is too short (9 characters). It should be at least 20 Characters long.
Headings
(Important)
The heading structure is perfect.

Heading structure

Heading levelContent
H1 Home Page
H2 Learn
H2 Find
H2 Download
H2 Explore
H2 Trending Articles
H2 PubMed Updates
H3 FTP Improvements Available for Testing
H3 Changes to Email Feature
H3 Phrase Searching in PubMed Tutorial Now Available
H3 Latest Literature Replaced by PubMed Updates
H4 Account
Some internal link anchor texts are too long.
The number of internal links is ok.
Every linktext is unique.
All internal links are not using dynamic parameters.
There are too many external links (35) on this page.

Found links on this page

LinkAttributesAnchor text
https://pubmed.ncbi.nlm.nih.gov/Anchor Skip to main page content
https://www.ncbi.nlm.nih.gov/External Subdomain IMG-ALT NIH NLM Logo
https://account.ncbi.nlm.nih.gov/External Subdomain Log in
/myncbi/Dashboard
/myncbi/collections/bibliography/Publications
/account/settings/Account settings
/account/signout/Log out
https://www.ncbi.nlm.nih.gov/g...External Subdomain Anchor Access keys
https://www.ncbi.nlm.nih.gov/External Subdomain NCBI Homepage
/myncbi/MyNCBI Homepage
https://pubmed.ncbi.nlm.nih.gov/Anchor Main Content
https://pubmed.ncbi.nlm.nih.gov/IMG-ALT pubmed logo
/advanced/Advanced
/clipboard/Clipboard
/about/About PubMed
/help/FAQs & User Guide
https://support.nlm.nih.gov/kn...External Subdomain Finding Full Text
/advanced/Advanced Search
/clinical/Clinical Queries
/citmatch/Single Citation Matcher
https://www.ncbi.nlm.nih.gov/b...External Subdomain E-utilities API
/download/FTP
/batchcitmatch/Batch Citation Matcher
https://www.ncbi.nlm.nih.gov/m...External Subdomain MeSH Database
https://www.ncbi.nlm.nih.gov/n...External Subdomain Journals
/11831734/The larger genomic RNA of Helicoverpa armigera stunt tetravirus encodes the viral RNA polymerase and has a novel 3'-terminal tRNA-like structure.
/40536974/In vivo CAR T cell generation to treat cancer and autoimmune disease.
/40536983/Neuroinflammation across neurological diseases.
/40532178/Neoadjuvant and Adjuvant Pembrolizumab in Locally Advanced Head and Neck Cancer.
/40516525/Senescence-resistant human mesenchymal progenitor cells counter aging in primates.
https://www.nlm.nih.gov/pubs/t...External Subdomain FTP Improvements Available for Testing
https://www.nlm.nih.gov/pubs/t...External Subdomain Changes to Email Feature
https://www.nlm.nih.gov/pubs/t...External Subdomain Phrase Searching in PubMed Tutorial Now Available
https://www.nlm.nih.gov/pubs/t...External Subdomain Latest Literature Replaced by PubMed Updates
https://www.ncbi.nlm.nih.gov/m...External Subdomain MeSH
https://www.ncbi.nlm.nih.gov/pmc/External Subdomain PMC
https://www.ncbi.nlm.nih.gov/b...External Subdomain Bookshelf
/disclaimer/Disclaimer
https://twitter.com/ncbiExternal No Text
https://www.facebook.com/ncbi.nlmExternal Subdomain No Text
https://www.linkedin.com/compa...External Subdomain No Text
https://github.com/ncbiExternal No Text
https://ncbiinsights.ncbi.nlm....External Subdomain No Text
https://www.nlm.nih.gov/social...External Subdomain Connect with NLM
https://twitter.com/NLM_NIHNew window External No Text
https://www.facebook.com/natio...New window External Subdomain No Text
https://www.youtube.com/user/N...New window External Subdomain No Text
https://www.google.com/maps/pl...New window External Subdomain 8600 Rockville Pike Bethesda, MD 20894
https://www.nlm.nih.gov/web_po...External Subdomain Web Policies
https://www.nih.gov/institutes...External Subdomain FOIA
https://www.hhs.gov/vulnerabil...External Subdomain HHS Vulnerability Disclosure
https://support.nlm.nih.gov/External Subdomain Help
https://www.nlm.nih.gov/access...External Subdomain Accessibility
https://www.nlm.nih.gov/career...External Subdomain Careers
https://www.nlm.nih.gov/External Subdomain NLM
https://www.nih.gov/External Subdomain NIH
https://www.hhs.gov/External Subdomain HHS
https://www.usa.gov/External Subdomain USA.gov

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://pubmed.ncbi.nlm.nih.gov/"
HTTP header
(Important)
No X-Powered HTTP header is sent.
The web server transmits the web page (HTML) in compressed form.
Performance
(Somewhat important)
The page response time is excellent with 0.17 seconds.
The file size of the HTML document is fine (41 kB).

HTTP Response Header

NameValue
dateMon, 23 Jun 2025 11:58:07 GMT
servernginx
strict-transport-securitymax-age=31536000; includeSubDomains; preload
varyorigin
content-typetext/html; charset=utf-8
cache-controlprivate
referrer-policysame-origin
x-frame-optionsDENY
x-content-type-optionsnosniff
cross-origin-opener-policysame-origin
content-encodinggzip
set-cookie137 Characters
x-ua-compatibleIE=Edge
x-xss-protection1; mode=block
via1.1 google
alt-svcclear
statuscode200
http_versionHTTP/2

External factors

This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 15,268 referring domains.
This page has 1,632,997 backlinks.
This page has backlinks from 10,493 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

User-agent: *
Crawl-delay: 1
Disallow: /api
Disallow: /rss
Disallow: /advanced/adv-suggestions/
Disallow: /terms/
Disallow: /addToHistory/
Disallow: /deleteHistory/
Disallow: /downloadHistory/
Disallow: /deleteHistoryRecord/
Disallow: /historyCacheExists/
Disallow: /*/references/
Disallow: /*/citations/
Disallow: /*/export/
Disallow: /*/citedby/
Disallow: /*/similar/
Disallow: /*/adj-nav/
Disallow: /ajax/
Disallow: /clipboard/
Disallow: /clipboard-next-page/
Disallow: /health/
Disallow: /deep-health-abstract/
Disallow: /deep-health-search/
Disallow: /deep-health-auth/
Disallow: /error/400/
Disallow: /error/403/
Disallow: /error/404/
Disallow: /error/500/
Disallow: /results-export-ids/
Disallow: /results-export-search-data/
Disallow: /results-export-email-by-search-data/
Disallow: /results-export-search-by-year/
Disallow: /send-email/
Disallow: /list-existing-collections/
Disallow: /add-to-existing-collection/
Disallow: /create-and-add-to-new-collection/
Disallow: /toggle-favorites-collection/
Disallow: /list-bibliography-delegates/
Disallow: /add-to-bibliography/
Disallow: /create-saved-search/
Disallow: /create-rss-feed-url/
Disallow: /searches/
Disallow: /collections/
Disallow: /more/
Disallow: /suggestions/
Disallow: /try-search-term/
Disallow: /rss-feed/

Sitemap: https://pubmed.ncbi.nlm.nih.gov/sitemap?p=index.xml

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pubmed.ncbi.nlm.nih.gov
PubMed
PubMed® comprises more than 38 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.

Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
PubMed81%Check
content PubMed65%Check
PubMed Central65%Check
PubMed Updates62%Check
PubMed website59%Check
gov54%Check
site51%Check
RNA51%Check
literature50%Check
page50%Check
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