Nlm.nih.gov - SEO Checker

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Overview of the SEO Check
Meta information
77% 
Page quality
76% 
Page structure
22% 
Link structure
88% 
Server
100% 
External factors
100% 
SEO Score
Response time
0.06 s
File size
34.90 kB
Words
536
Media files
31
Number of links
26 internal / 32 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
National Library of Medicine - National Institutes of Health
The length of the page title is perfect. (514 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
The meta description is missing.
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en
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)
The domain is no subdomain.
The domain length is good.
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 character encoding is not specified in the HTTP header.
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)
No favicon is linked in the HTML code.

Meta tags

NameValue
viewportwidth=device-width, initial-scale=1, shrink-to-fit=no
DC.TitleNational Library of Medicine - National Institutes of Health
DC.PublisherU.S. National Library of Medicine
DC.Date.Issued1993-10-10
DC.Date.Modified2025-01-14
NLMDC.Date.LastReviewed2025-02-18
NLM.Contact.Email[email protected]
DC.TypeOther
DC.RightsPublic Domain
DC.Languageeng
langen
X-UA-CompatibleIE=edge,chrome=1
Content-Typetext/html; charset=UTF-8

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Page quality

Content
(Critically important)
Some words from the page title are not used within the pages content
This page contains 536 words. That's ok.
30.2% of the text are stop words.
The page contains a listing, which indicates a good text layout.
10 paragraphs were found on this page.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 18.22 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
A viewport "width=device-width, initial-scale=1, shrink-to-fit=no" is provided.
Bold and strong tags
(Somewhat important)
The amount of tags is very high (13). We recommend using a maximum of 11 tags for this page.
Some tags are too long. With 92 characters this one is longer than 70 characters:
"read research highlights | meet our principal investigators | explore training opportunities"
Image SEO
(Somewhat important)
2 images have no alt attribute. The content of alt attributes is used by search engines.
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
....nlm.nih.gov/uswds/img/us_flag_small.pngU.S. flag
...s.nlm.nih.gov/uswds/img/icon-dot-gov.svgNo alt attribute provided
...ets.nlm.nih.gov/uswds/img/icon-https.svgNo alt attribute provided
...sets.nlm.nih.gov/uswds/img/NLM_White.pngNLM logo
assets.nlm.nih.gov/uswds/img/close.svgclose
/images/icon_pubmed.svgPubMed
/images/icon_medline.svgMedLine Plus
/images/icon_openi.svgOpen-i
/images/icon_mesh.svgMESH
/images/icons_clinical.svgClinical Trials
/images/icon_blast.svgBLAST
/images/NLM_Announcements_megaphone.pngSpotlights and Events
/images/Musings_Mezzanine.jpgMusings from the Mezzanine
/images/NCBI_Insights.pngNCBI Insights
/images/Circulating_Now.jpgCirculating Now
/images/MedPlus_Mag.pngNIH MedlinePlus Magazine
/images/Technical_Bulletin.jpgTechnical Bulletin
/images/NIH_Virtual_Tour.jpgNIH Virtual Tour: National Library of Medicine
...ia-youtube/Sys9Ki6t4DQ.jpg?itok=Xi7SIHilPhoto of Dr. Lu presenting the framework for TrialGPT
/about/image/IRP_home.jpgIRP home no text.
https://www.nlm.nih.gov/images/IT.jpgDoctors with tablet
https://www.nlm.nih.gov/images/it3.jpgDoctor with tablet
/images/training3.jpgWoman at the conference
https://www.nlm.nih.gov/images/history3.jpgOld photo of NLM
https://www.nlm.nih.gov/images/history.jpgCurrent photo of NLM
/images/StrategicPlan2.jpgStrategic Plan cover
https://www.nlm.nih.gov/images/facebook.svgFacebook
https://www.nlm.nih.gov/images/linkedin.svgLinkedIn
https://www.nlm.nih.gov/images/twitter.svgTwitter
https://www.nlm.nih.gov/images/youtube.svgYou Tube
https://www.nlm.nih.gov/images/mail.svgGovernment Delivery

Page structure

H1 heading
(Critically important)
Highlights
Too many H1 headings
The H1 heading consists of only one word. There should be more information given.
The H1 heading is too short (10 characters). It should be at least 20 Characters long.
Headings
(Important)
The structure of headings is missing one or more levels. Do not skip heading levels.
There are 27 headings on the page. The amount of headings should be in a more proper relation to the amount of text.

Heading structure

Heading levelContent
H1 Highlights
H1 Of Interest
H1 Research at NLM
H1 Historical Collections at NLM
H1 Biomedical and Clinical Informatics at NLM
H1 About NLM
H2 NIH-developed AI algorithm matches potential volunteers to clinical trials
H4 NLM Division of Intramural Research
H4 Health IT and Health Data Standards
H4 Unified Medical Language System (UMLS) Terminology Services
H4 Biomedical Informatics Training Program
H4 History
H4 Organization
H4 Strategic Plan
H5 PubMed
H5 MedlinePlus
H5 Open-i
H5 MeSH
H5 ClinicalTrials.gov
H5 BLAST
H5 Spotlights and Events
H5 Musings from the Mezzanine
H5 NCBI Insights
H5 Circulating Now
H5 NIH MedlinePlus Magazine
H5 Technical Bulletin
H5 NIH Virtual Tour: National Library of Medicine
Some anchor texts are used more than once.
The number of internal links is ok.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are too many external links (32) on this page.

Found links on this page

LinkAttributesAnchor text
https://www.nlm.nih.gov/Anchor Skip to main content
https://www.nlm.nih.gov/Subdomain IMG-ALT NLM logo
https://www.ncbi.nlm.nih.gov/p...External Subdomain PubMed Citations for biomedical literature
IMG-ALT PubMed
https://medlineplus.gov/?_gl=1...External MedlinePlus Reliable, up-to-date health information for you
IMG-ALT MedLine Plus
https://openi.nlm.nih.gov/External Subdomain Open-i An experimental multimedia search engine
IMG-ALT Open-i
https://www.ncbi.nlm.nih.gov/meshExternal Subdomain MeSH Medical Subject Headings
IMG-ALT MESH
https://clinicaltrials.gov/External ClinicalTrials.gov A database of clinical studies, worldwide
IMG-ALT Clinical Trials
https://blast.ncbi.nlm.nih.gov...External Subdomain BLAST Basic Local Alignment Search Tool
IMG-ALT BLAST
/news/newsevents.htmlIMG-ALT Spotlights and Events
/news/newsevents.htmlText duplicate Spotlights and Events
https://nlmdirector.nlm.nih.gov/External Subdomain IMG-ALT Musings from the Mezzanine
https://nlmdirector.nlm.nih.gov/External Subdomain Text duplicate Musings from the Mezzanine
https://ncbiinsights.ncbi.nlm....External Subdomain IMG-ALT NCBI Insights
https://ncbiinsights.ncbi.nlm....External Subdomain Text duplicate NCBI Insights
https://circulatingnow.nlm.nih...External Subdomain IMG-ALT Circulating Now
https://circulatingnow.nlm.nih...External Subdomain Text duplicate Circulating Now
https://magazine.medlineplus.gov/External Subdomain IMG-ALT NIH MedlinePlus Magazine
https://magazine.medlineplus.gov/External Subdomain Text duplicate NIH MedlinePlus Magazine
/pubs/techbull/tb.htmlIMG-ALT Technical Bulletin
/pubs/techbull/tb.htmlText duplicate Technical Bulletin
https://www.nih.gov/virtual-tour/External Subdomain Anchor IMG-ALT NIH Virtual Tour: National Library of Medicine
https://www.nih.gov/virtual-tour/External Subdomain Anchor Text duplicate NIH Virtual Tour: National Library of Medicine
https://www.nih.gov/virtual-tour/External Subdomain Anchor NLM is the world's largest biomedical library and a national resource for health professionals, scientists, and the public.
https://www.youtube.com/embed/...External Subdomain IMG-ALT Photo of Dr. Lu presenting the framework for TrialGPT
/news/AI_algorithm_volunteers_...Subdomain Read more about TrialGPT
/research/index.htmlSubdomain NLM Division of Intramural Research
/research/highlights.htmlSubdomain READ RESEARCH HIGHLIGHTS
/research/researchstaff/staff-...Subdomain MEET OUR PRINCIPAL INVESTIGATORS
/research/training.htmlSubdomain EXPLORE TRAINING OPPORTUNITIES
/healthit/index.htmlHealth IT and Health Data Standards
/healthit/index.htmlLearn about NLM’s contributions to Health IT
https://uts.nlm.nih.gov/uts/External Subdomain Unified Medical Language System (UMLS) Terminology Services
https://uts.nlm.nih.gov/uts/External Subdomain Explore UMLS
/research/training.htmlSubdomain Biomedical Informatics Training Program
/research/training.htmlSubdomain Investigate training opportunities
/about/briefhistory.htmlHistory
/about/briefhistory.htmlExplore our past
/about/org.htmlOrganization
/about/org.htmlExplore the Library
/pubs/plan/lrp17/NLM_Strategic...Strategic Plan
/pubs/plan/lrp17/NLM_Strategic...VIEW OUR STRATEGIC PLAN
/socialmedia/index.htmlSubdomain Connect with NLM
https://www.facebook.com/natio...External Subdomain IMG-ALT Facebook
https://www.linkedin.com/compa...External Subdomain IMG-ALT LinkedIn
A-TITLE External link: please review our privacy policy.
https://twitter.com/NLM_NIHExternal IMG-ALT Twitter
A-TITLE External link: please review our privacy policy.
https://www.youtube.com/user/N...External Subdomain IMG-ALT You Tube
A-TITLE External link: please review our privacy policy.
https://public.govdelivery.com...External Subdomain IMG-ALT Government Delivery
A-TITLE External link: please review our privacy policy.
https://www.google.com/maps/pl...External Subdomain 8600 Rockville Pike Bethesda, MD 20894
/web_policies.htmlWeb Policies
https://www.nih.gov/institutes...External Subdomain FOIA
https://www.hhs.gov/vulnerabil...External Subdomain HHS Vulnerability Disclosure
https://support.nlm.nih.gov/?fromExternal Subdomain NLM Support Center
/accessibility.htmlAccessibility
/careers/careers.htmlCareers
https://www.nlm.nih.gov/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)
The checked page does not redirect to another URL.
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 0.06 seconds.
The file size of the HTML document is fine (35 kB).

HTTP Response Header

NameValue
content-typetext/html
x-amz-id-22czEUSKsUGMbRHqRuB/9m+gbEEaccjjEVUPhBza1ZzWTt+rs/08TTU9UJ7eOq1wugj1nQO6449Uw4aczEeEOnhGg787+5x0wmcT7X+rCg1M=
x-amz-request-idHRCX89YGXP93MHNJ
x-amz-replication-statusCOMPLETED
last-modifiedTue, 18 Feb 2025 16:38:51 GMT
x-amz-server-side-encryptionAES256
x-amz-version-idA5F773hwJVmcG8rYtmlpQzUarX6QMwjK
serverAmazonS3
x-frame-optionsSAMEORIGIN
strict-transport-securitymax-age=31536000; includeSubDomains; preload
content-encodinggzip
dateTue, 08 Apr 2025 23:23:30 GMT
etagW/"b6313737f0aab23bc21728f13ef3f5b2"
varyAccept-Encoding
x-cacheHit from cloudfront
via1.1 22ec86e3f4ec676e17ef8eea76eefba2.cloudfront.net (CloudFront)
x-amz-cf-popFRA56-P6
x-amz-cf-idYdcpM_lco1zh0s7HyoPk1CI5CCI16bbCTTZTcJb-L_j2uR6JXQvOhw==
age100
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 6,341 referring domains.
This page has 1,443,253 backlinks.
This page has backlinks from 3,518 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

User-agent: *
Disallow: /accenture/
Disallow: /cgi/
Disallow: /sitemessages/
Disallow: /admin/
Disallow: /homedev/
Disallow: /test/
Disallow: /web/documentation/accessibility-checklists/
# Archived pages
Disallow: /archive/
# MEDLINEplus specfic
Disallow: /medlineplus2/
Disallow: /medlineplus/medplapp/
Disallow: /medlineplus/URLchecker/
Disallow: /medlineplus/usp/
Disallow: /medlineplus/logs/
Disallow: /medlineplus/stats/
Disallow: /medlineplus/glftp/
Disallow: /medlineplus/procedures/
Disallow: /medlineplus/mobilefeeds/
Disallow: /medlineplus/spanish/mobilefeeds/
Disallow: /medlineplus/feeds/topics/
Disallow: /medlineplus/groupfeeds/
Disallow: /medlineplus/spanish/feeds/topics/
Disallow: /medlineplus/spanish/groupfeeds/
Disallow: /medlineplus/golocal/
Disallow: /medlineplus/golocaldocs/
Disallow: /medlineplus/xml/
Disallow: /medlineplus/xml/vocabulary/
Disallow: /medlineplus/scwidget/topsearch.html
Disallow: /medlineplus/spanish/scwidget/topsearch.html

# Framed versions of vhp presentations.  Non-framed versions are allowed - TSL 05JAN1999
Disallow: /research/visible/vhpconf98/AUTHORS/WERNER2/
Disallow: /research/visible/vhpconf98/AUTHORS/SACHSE2/

# GoLocal extranet
Disallow: /golocal/extranet/

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Most important keywords

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

KeywordResultRecheck
NLM63%Check
gov58%Check
NIH58%Check
Library56%Check
Highlights55%Check
Health54%Check
National Library54%Check
National52%Check
Medicine52%Check
Clinical Trial48%Check
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