Nibbler SEO audit for www.ncbi.nlm.nih.gov

Overall9.1

The overall score for this website.

Accessibility9.7

How accessible the website is to mobile and disabled users.

The following tests contribute to this score:

Experience9.7

How satisfying the website is likely to be for users.

Marketing8.5

How well marketed, and popular the website is.

Technology9.3

How well designed and built the website is.

Nibbler tested a sample of 5 pages from this website at 23:33 on 19 Mar 2024 (GMT).

Top priorities for website improvement

  • Make sure that all the pages of this website include a meta description. If you don't include one, Google will choose a sample of text from the page to appear in the search engine result. By including a meta description, you can control how your search engine result will appear. (read more)
  • Consider the amount of text on this website and increase it if appropriate. (read more)
  • Consider shortening long anchor text. (read more)

Meta tags2.0

Meta Tags (name attribute)

Page URLNameContent
www.ncbi.nlm.nih.gov/ncbiexpanderminHeight: 70
www.ncbi.nlm.nih.gov/ncbi_appguide
www.ncbi.nlm.nih.gov/ncbi_pdidHomePage
www.ncbi.nlm.nih.gov/account/.../ncbiexternallink'pop':'fitTop'
www.ncbi.nlm.nih.gov/account/.../paf_templateStdNCol
www.ncbi.nlm.nih.gov/account/.../ncbi_appaccount
www.ncbi.nlm.nih.gov/account/.../ncbi_pdidsignout-page
www.ncbi.nlm.nih.gov/account/.../ncbi_phidCE8A58BD5F9F5A21000000000590048C.m_3
www.ncbi.nlm.nih.gov/account/.../referrerorigin-when-cross-origin
www.ncbi.nlm.nih.gov/guide/.../paf-app-resources
www.ncbi.nlm.nih.gov/guide/.../paf_templateStdNCol
www.ncbi.nlm.nih.gov/guide/.../ncbi_appguide
www.ncbi.nlm.nih.gov/guide/.../ncbi_pdidstatic
www.ncbi.nlm.nih.gov/guide/.../node-id3690
www.ncbi.nlm.nih.gov/guide/.../revision-id37668
www.ncbi.nlm.nih.gov/guide/.../created2014-06-18T09:44:24-04:00
www.ncbi.nlm.nih.gov/guide/.../modified2016-12-01T17:09:58-05:00
www.ncbi.nlm.nih.gov/guide/.../publication-date2014-06-18T09:39:00-04:00
www.ncbi.nlm.nih.gov/guide/.../subsiteguide
www.ncbi.nlm.nih.gov/guide/.../pathguide/browsers
www.ncbi.nlm.nih.gov/guide/.../node-typepage
www.ncbi.nlm.nih.gov/guide/.../jira-ticket
www.ncbi.nlm.nih.gov/guide/.../ncbi_phidCE8D59665FA0FAA10000000001EC018D.m_4
www.ncbi.nlm.nih.gov/guide/.../referrerorigin-when-cross-origin
www.ncbi.nlm.nih.gov/home/.../ncbi_appguide4beta
www.ncbi.nlm.nih.gov/home/.../ncbi_pdidaction
www.ncbi.nlm.nih.gov/home/.../ncbi_appguide4beta
www.ncbi.nlm.nih.gov/home/.../ncbi_pdidaction

Meta Tags (http-equiv attribute)

Page URLNameContent
www.ncbi.nlm.nih.gov/Content-Typetext/html; charset=UTF-8
www.ncbi.nlm.nih.gov/account/.../Content-Typetext/html; charset=utf-8
www.ncbi.nlm.nih.gov/guide/.../Content-Typetext/html; charset=utf-8

Amount of content8.2

Rendering Chart...

  • This website has an average of 479 words per page. The amount of content on a website has been shown to correlate with its search engine ranking.
    • Consider the amount of text on this website and increase it if appropriate.

Headings9.0

abuse accesskeys account activities adjust adjusting advice analyze basic biotechnology blocked browser browsers cache carry center clear clearing contents cookies creating develop diverse download enable errors general history information introduction javascript learn list load mission national ncbi operating organizational page pages popular possible privacy programs research researchers resolve resources responsibilities settings structure submit supported system-specific table tips tricks webpage welcome your

  • All pages were found to use defined headings. This is excellent as it allows visitors and search engines to summarise the content of webpages quickly. Correctly defined headings aid accessibility and are particularly important for search engine optimisation.
  • Some pages did not define headings correctly. The H1 tag should be used for the most top-level heading, with H2 being used for sub-headings and H3 for further sub-headings and so-on. Not conforming to this convention may confuse visitors.
    • Ensure that headings are defined in a semantically correct way, i.e. always start with a H1 tag. This is used to summarise the page content. Further tags (H2, H3, H4 etc) are meant to summarise and partition sections within the content.

Page headings detail

URLHeadingLevel
www.ncbi.nlm.nih.gov/NCBIH1
www.ncbi.nlm.nih.gov/Welcome to NCBIH1
www.ncbi.nlm.nih.gov/National Center for Biotechnology InformationH2
www.ncbi.nlm.nih.gov/SubmitH2
www.ncbi.nlm.nih.gov/DownloadH2
www.ncbi.nlm.nih.gov/LearnH2
www.ncbi.nlm.nih.gov/DevelopH2
www.ncbi.nlm.nih.gov/AnalyzeH2
www.ncbi.nlm.nih.gov/ResearchH2
www.ncbi.nlm.nih.gov/Popular ResourcesH3
www.ncbi.nlm.nih.gov/AccountH4
www.ncbi.nlm.nih.gov/account/.../AccountH4
www.ncbi.nlm.nih.gov/guide/.../NCBIH1
www.ncbi.nlm.nih.gov/guide/.../Browser Advice for NCBI Web PagesH1
www.ncbi.nlm.nih.gov/guide/.../National Center for Biotechnology InformationH2
www.ncbi.nlm.nih.gov/guide/.../Supported BrowsersH2
www.ncbi.nlm.nih.gov/guide/.../Table of Contents:H2
www.ncbi.nlm.nih.gov/guide/.../Tricks & Tips to Resolve Webpage ErrorsH2
www.ncbi.nlm.nih.gov/guide/.../Enable JavaScriptH2
www.ncbi.nlm.nih.gov/guide/.../Enable CookiesH2
www.ncbi.nlm.nih.gov/guide/.../Clearing History and Cache & Adjusting Privacy SettingsH2
www.ncbi.nlm.nih.gov/guide/.../AccessKeysH2
www.ncbi.nlm.nih.gov/guide/.../To resolve page load errorsH3
www.ncbi.nlm.nih.gov/guide/.../To resolve "Blocked for Possible Abuse" ErrorsH3
www.ncbi.nlm.nih.gov/guide/.../To enable JavaScript in your browser:H3
www.ncbi.nlm.nih.gov/guide/.../To enable cookies in your browser:H3
www.ncbi.nlm.nih.gov/guide/.../Clear Browser CacheH3
www.ncbi.nlm.nih.gov/guide/.../Clear Browser HistoryH3
www.ncbi.nlm.nih.gov/guide/.../Adjust Browser Privacy SettingsH3
www.ncbi.nlm.nih.gov/guide/.../List of NCBI AccesskeysH3
www.ncbi.nlm.nih.gov/guide/.../Browser and Operating System-specific AccessKeys:H3
www.ncbi.nlm.nih.gov/guide/.../AccountH4
www.ncbi.nlm.nih.gov/home/.../About NCBIH1
www.ncbi.nlm.nih.gov/home/.../Our MissionH2
www.ncbi.nlm.nih.gov/home/.../Organizational StructureH2
www.ncbi.nlm.nih.gov/home/.../Programs & ActivitiesH2
www.ncbi.nlm.nih.gov/home/.../Researchers at NCBIH2
www.ncbi.nlm.nih.gov/home/.../AccountH4
www.ncbi.nlm.nih.gov/home/.../Our MissionH1
www.ncbi.nlm.nih.gov/home/.../General IntroductionH2
www.ncbi.nlm.nih.gov/home/.../Creating NCBIH2
www.ncbi.nlm.nih.gov/home/.../Basic ResearchH2
www.ncbi.nlm.nih.gov/home/.../To carry out its diverse responsibilities, NCBI:H3
www.ncbi.nlm.nih.gov/home/.../AccountH4

Server behaviour9.2

Yes404 page

YesCompression

  • This website handles missing pages correctly by sending a 404 HTTP status code.
  • This website was served with GZIP encoding. This is very good because it reduces the loading time of a web page.
  • 2 of the pages of this website follow the best practice of using a permanent (HTTP 301) redirect between URLs with/without trailing slashes. These pages are ideal.
  • 2 of the pages of this website return page content with or without a trailing slash on their URLs. Search engines might see these as separate pages with duplicate content which they could penalise for.
  • This website follows the best practice of using a permanent (HTTP 301) redirect from http://ncbi.nlm.nih.gov to http://www.ncbi.nlm.nih.gov. This is ideal.

Images9.9

5% of images have a clearly defined size

2 images are being resized by the browser

Mobile10.0

Mobile screenshot of www.ncbi.nlm.nih.govTablet screenshot of www.ncbi.nlm.nih.gov
  • All of this website appears to be optimised for viewing on a mobile phone or a tablet.

Media specific CSS detected

MediaMin widthMax widthCSS file
screen-1200pxwww.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen1201px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen1201px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen375px-www.ncbi.nlm.nih.gov/home/.../page.css
screen640px-www.ncbi.nlm.nih.gov/home/.../page.css
screen-600pxwww.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen951px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen951px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen992px-www.ncbi.nlm.nih.gov/home/.../page.css
screen-1200pxstatic.pubmed.gov/portal/.../4005757.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen1201px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen1201px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen375px-static.pubmed.gov/portal/.../4206132.css
screen640px-static.pubmed.gov/portal/.../4206132.css
screen-600pxstatic.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen951px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen951px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen992px-static.pubmed.gov/portal/.../4206132.css
screen-1200pxstatic.pubmed.gov/portal/.../4005757.css
only screen-1007pxwww.ncbi.nlm.nih.gov/home/.../header.css
only screen-980pxwww.ncbi.nlm.nih.gov/home/.../header.css
only screen-858pxwww.ncbi.nlm.nih.gov/home/.../header.css
only screen-660pxwww.ncbi.nlm.nih.gov/home/.../header.css
only screen906px1060pxwww.ncbi.nlm.nih.gov/home/action-pgs.css
only screen-905pxwww.ncbi.nlm.nih.gov/home/medium_screen.css

Analytics10.0

100% of pages use analytics

Multiple Analytics Solutions

  • Every page in this website is using some form of analytics software. This is excellent and should allow for a complete analysis of visitor behaviour.

Analytics Software Found

Software Name
Google Analytics
Google Tag Manager

Page titles10.0

100% of pages have defined titles

0% of page titles are weak

  • All pages were found to use page titles appropriately. Page titles appear in search results and at the top of the browser's window when visiting the site. Appropriate page titles are particularly important for search engine optimisation.

Page titles

Page titleNotes
No TitleMissing
No TitleMissing
No TitleMissing
No TitleMissing
No TitleMissing

Printability10.0

100% of pages are optimised for printing

  • All of this website appears to be optimised for printing (using CSS).

Media specific CSS detected

MediaMin widthMax widthCSS file
screen-1200pxwww.ncbi.nlm.nih.gov/home/.../page.css
print--www.ncbi.nlm.nih.gov/home/.../page.css
print--www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen1201px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen1201px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen375px-www.ncbi.nlm.nih.gov/home/.../page.css
screen640px-www.ncbi.nlm.nih.gov/home/.../page.css
screen-600pxwww.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen951px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen951px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen600px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen481px-www.ncbi.nlm.nih.gov/home/.../page.css
screen992px-www.ncbi.nlm.nih.gov/home/.../page.css
screen-1200pxstatic.pubmed.gov/portal/.../4005757.css
print--static.pubmed.gov/portal/.../4005757.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen1201px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen1201px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen375px-static.pubmed.gov/portal/.../4206132.css
screen640px-static.pubmed.gov/portal/.../4206132.css
screen-600pxstatic.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen951px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen951px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen600px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen481px-static.pubmed.gov/portal/.../4206132.css
screen992px-static.pubmed.gov/portal/.../4206132.css
print--static.pubmed.gov/portal/.../3529741.css
screen-1200pxstatic.pubmed.gov/portal/.../4005757.css
print--static.pubmed.gov/portal/.../4005757.css
print--static.pubmed.gov/portal/.../3529741.css
only screen-1007pxwww.ncbi.nlm.nih.gov/home/.../header.css
only screen-980pxwww.ncbi.nlm.nih.gov/home/.../header.css
only screen-858pxwww.ncbi.nlm.nih.gov/home/.../header.css
only screen-660pxwww.ncbi.nlm.nih.gov/home/.../header.css
only screen906px1060pxwww.ncbi.nlm.nih.gov/home/action-pgs.css
only screen-905pxwww.ncbi.nlm.nih.gov/home/medium_screen.css

URL format10.0

  • This website uses appropriate web addresses (URLs) throughout. This is excellent and will help search engine placement, usability and the marketability of this website.

Popularity10.0

74527708Estimated monthly organic visitors

  • This website appears to have a high number of monthly website visits each month

Source: Ahrefs

Freshness10.0

Last updated February 27, 2024

  • It looks like this website was last updated on Tuesday, 27 February 2024. This is good because visitors perceive up-to-date websites as more credible. Websites that are updated regularly are also spidered by search engines more often.
  • To find this information we used the last modified dates reported by this website's server in addition to looking for dates written on each page.

All dates found

DateFileSource
01/12/2016www.ncbi.nlm.nih.gov/guide/.../Body text
27/02/2024www.ncbi.nlm.nih.gov/.../exhibits.svgLast modified header
27/02/2024www.ncbi.nlm.nih.gov/home/.../api.svgLast modified header
27/02/2024www.ncbi.nlm.nih.gov/.../community.svgLast modified header
27/02/2024www.ncbi.nlm.nih.gov/.../about-ncbi.jpgLast modified header
27/02/2024www.ncbi.nlm.nih.gov/.../search-white.svgLast modified header
27/02/2024www.ncbi.nlm.nih.gov/home/.../clear.pngLast modified header
27/02/2024www.ncbi.nlm.nih.gov/.../research.svgLast modified header
27/02/2024www.ncbi.nlm.nih.gov/.../analyze.svgLast modified header
27/02/2024www.ncbi.nlm.nih.gov/.../develop.svgLast modified header
27/02/2024www.ncbi.nlm.nih.gov/home/.../learn.svgLast modified header
27/02/2024www.ncbi.nlm.nih.gov/.../download.svgLast modified header
27/02/2024www.ncbi.nlm.nih.gov/home/.../submit.svgLast modified header
19/03/2021www.ncbi.nlm.nih.gov/.../AgencyLogo.svgLast modified header
13/11/2020www.ncbi.nlm.nih.gov/.../icon-https.svgLast modified header
13/11/2020www.ncbi.nlm.nih.gov/.../icon-dot-gov.svgLast modified header
13/11/2020www.ncbi.nlm.nih.gov/.../favicon-57.pngLast modified header
27/02/2024www.ncbi.nlm.nih.gov/.../normalize.cssLast modified header
27/02/2024www.ncbi.nlm.nih.gov/.../standard_base.cssLast modified header
27/02/2024www.ncbi.nlm.nih.gov/home/new_grid.cssLast modified header
27/02/2024www.ncbi.nlm.nih.gov/home/homepage.cssLast modified header
27/02/2024www.ncbi.nlm.nih.gov/home/.../page.cssLast modified header
27/02/2024www.ncbi.nlm.nih.gov/home/action-pgs.cssLast modified header
27/02/2024www.ncbi.nlm.nih.gov/home/medium_screen.cssLast modified header
27/02/2024www.ncbi.nlm.nih.gov/home/app.cssLast modified header
27/02/2024www.ncbi.nlm.nih.gov/home/.../header.cssLast modified header
27/02/2024www.ncbi.nlm.nih.gov/home/.../footer.cssLast modified header
27/02/2024www.ncbi.nlm.nih.gov/.../check_youtube.cssLast modified header
27/02/2024www.ncbi.nlm.nih.gov/home/.../clear.cssLast modified header
27/02/2024www.ncbi.nlm.nih.gov/.../override.cssLast modified header

Twitteri

This website does not appear to be associated with a Twitter account.

  • There was a problem checking the Twitter accounts associated with this website.

Domain agei

  • Sorry, we cannot check the domain age of .gov websites.

Fast, branded website audits

Insites creates professional website reports that can be shared with your clients.

How does Insites compare?

Tests 17 fixed tests 50+ testsCovers SEO, SEM, Google My Business, reviews, social media and much more
Add your brandingNoYes
Export & shareNoPDF & link
Lead generationNoEmbed on your site
Competitor auditsNoYes
Test as a batchNoYes
Integrations + APINoYes
Multi-lingualNo20+ languages
Try it free