Home.cern - SEO Checker

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Overview of the SEO Check
Meta information
66% 
Page quality
79% 
Page structure
29% 
Link structure
15% 
Server
54% 
External factors
100% 
SEO Score
Response time
0.13 s
File size
157.40 kB
Words
862
Media files
8
Number of links
171 internal / 33 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Home | CERN
The page title is too short. (129 pixels of 580 max pixel length) Optimize title
There are no duplicate words in the title
Meta description
(Critically important)
CERN, the European Organization for Nuclear Research, is one of the world’s largest and most respected centres for scientific research. Its business is fundamental physics, finding out what the Universe is made of and how it works.
The meta description is too long: 1430 pixels from max. 1000 pixels. Optimize description
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
https://home.cern/
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)
The specified alternate links have no errors.
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 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
descriptionCERN, the European Organization for Nuclear Research, is one of the world’s largest and most respected centres for scientific research. Its business is fundamental physics, finding out what the Universe is made of and how it works.
keywordsphysics, CERN, Large Hadron Collider, LHC, high-energy physics, particles, science
GeneratorDrupal 10 (https://www.drupal.org)
MobileOptimizedwidth
HandheldFriendlytrue
viewportwidth=device-width, initial-scale=1.0
langen
charsetutf-8

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Page quality

Content
(Critically important)
This page contains 862 words. That's ok.
23% of the text are stop words.
Words from the H1 heading are used in the page content.
The page contains a listing, which indicates a good text layout.
3 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 22.33 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
This page loads 56 JavaScript files. This may affect the load time negatively.
A viewport "width=device-width, initial-scale=1.0" is provided.
Bold and strong tags
(Somewhat important)
Some tags are too long. With 78 characters this one is longer than 70 characters:
"cloud experiment resolves puzzle of new aerosol particles in upper troposphere"
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
/sites/default/files/logo/cern-logo.pnghome
...ges/pkatyaya/1209226_01-A5-at-72-dpi.jpgimg
...iles/inline-images/lburdych/Facebook.pngFacebook icon
...les/inline-images/lburdych/Instagram.pngInstagram icon
...iles/inline-images/lburdych/TikTok_0.pngTikTok icon
...fault/files/inline-images/lburdych/X.pngX icon
...iles/inline-images/lburdych/LinkedIn.pngLinkedIn icon
...files/inline-images/lburdych/Youtube.pngYoutube icon

Page structure

H1 heading
(Critically important)
CERN Accelerating science
Too many H1 headings
Headings
(Important)
Some headings occur twice on the page.
There are 47 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 CERN Accelerating science
H1 Featured resources
H1 Latest News
H1 Explore CERN
H1 Upcoming events
H1 Key Achievements
H2 CERN
H2 Science
H2 Find us
H2 CERN & You
H2 General Information
H3 CLOUD experiment resolves puzzle of new aeros...
H3 CERN signs long-term solar power agreements
H3 CERN launches Resonance, a new arts collabora...
H3 CERN Council selects Mark Thomson as next Dir...
H3 CERN Courier Sep/Oct 2024
H3 High-Luminosity LHC images
H3 LHC Facts and Figures
H3 CERN highlights in 2024 celebrating 70 years
H3 The measurement of a lifetime
H3 LHCb sheds light on two pieces of the matter–...
H3 The test stand for the High-Luminosity LHC we...
H3 A tale of two Higgs: CMS searches for the pro...
H3 ALICE finds first ever evidence of the antima...
H3 CLOUD experiment resolves puzzle of new aeros... Duplicate text
H3 CERN signs long-term solar power agreements Duplicate text
H3 CERN launches Resonance, a new arts collabora... Duplicate text
H3 Plan your CERN visit
H3 Take an immersive tour of CERN's accelerators
H3 Explore CERN's educational resources
H3 CERN and the environment
H3 Technology from CERN to society
H3 Exhibitions training: ELISA-Guides
H3 Exhibitions training: ELISA-Guides Duplicate text
H3 ACAT IAC Meeting
H3 Nuclear Shape and BSM Searches at Colliders
H3 FPGA Programming Using LabVIEW - Hands-On Workshop
H3 Advances in spectral density estimations for lattice gauge theories...
H3 Talk by Einan Gardi
H3 Introduction course for guides
H3 EFT combination of SM measurements
H3 The Higgs boson
H3 The Large Hadron Collider
H3 Antimatter
H3 The birth of the Web
H3 W boson
H3 Z boson
Some internal links have dynamic parameters. All internal URLs, which are not marked as nofollow, should not contain dynamic parameters.
Some anchor texts are used more than once.
25 links don't have an anchor text.
The number of internal links is ok.
None of the anchor texts is too long.
There are too many external links (33) on this page.

Found links on this page

LinkAttributesAnchor text
https://home.cern/Anchor Skip to main content
https://home.cern/CERN Accelerating science
A-TITLE CERN
/user/login?destinationSign in
https://cern.ch/directoryExternal Directory
A-TITLE Search CERN resources and browse the directory
https://home.cern/IMG-ALT home
A-TITLE Home
https://home.cern/aboutKnow more
/about/who-we-areWho we are
/about/who-we-are/our-missionOur Mission
/about/who-we-are/our-governanceOur Governance
/about/who-we-are/our-governan...Our Member States
/about/who-we-are/our-historyOur History
/about/who-we-are/our-peopleOur People
/about/what-we-doWhat we do
/about/what-we-do/fundamental-...Fundamental research
/about/what-we-do/our-impactContribute to society
/about/what-we-do/environmenta...Environmentally responsible research
/about/what-we-do/bring-nation...Bring nations together
/about/what-we-do/inspire-educateInspire and educate
https://home.cern/resources/faqsFast facts and FAQs
/about/key-achievementsKey Achievements
/science/physics/higgs-bosonThe Higgs Boson
/science/physics/w-boson-sunsh...The W boson
/science/physics/z-bosonThe Z boson
/science/accelerators/large-ha...The Large Hadron Collider
/science/computing/birth-webThe Birth of the web
/science/physics/antimatterAntimatter
/news/press-release/physics/cl...No Text
/news/press-release/physics/cl...CLOUD experiment resolves puzzle of new aeros...
A-TITLE CLOUD experiment resolves puzzle of new aerosol particles in upper troposphere
/news/news/engineering/cern-si...No Text
/news/news/engineering/cern-si...CERN signs long-term solar power agreements
A-TITLE CERN signs long-term solar power agreements
/news/news/cern/cern-launches-...No Text
/news/news/cern/cern-launches-...CERN launches Resonance, a new arts collabora...
A-TITLE CERN launches Resonance, a new arts collaboration with the Republic and Canton of Geneva and the City of Geneva
/news/press-release/cern/cern-...No Text
/news/press-release/cern/cern-...CERN Council selects Mark Thomson as next Dir...
A-TITLE CERN Council selects Mark Thomson as next Director-General, starting in 2026
/news?audience=23Latest news
/news?audience=23News
https://home.cern/news?topic=1114Accelerators
https://home.cern/news?topic=1118At CERN
https://home.cern/news?topic=1116Computing
https://home.cern/news?topic=1115Engineering
https://home.cern/news?topic=1117Experiments
https://home.cern/news?topic=1119Knowledge sharing
https://home.cern/news?topic=1113Physics
https://home.cern/eventsEvents
https://home.cern/cern-communityCERN Community
/news?audience=24News and announcements
https://home.cern/news?type=45Official communications
/tags/events-cernText duplicate Events
https://home.cern/scientistsScientists
/news?audience=19Text duplicate News
https://home.cern/pressPress Room
/news?audience=22Media News
https://home.cern/press/resourcesResources
https://home.cern/press/contactContact
https://home.cern/scienceText duplicate Know more
https://home.cern/science/physicsText duplicate Physics
/science/physics/antimatterText duplicate Antimatter
/science/physics/dark-matterDark matter
/science/physics/early-universeThe early universe
/science/physics/higgs-bosonThe Higgs boson
/science/physics/standard-modelThe Standard Model
https://home.cern/science/physics+ More
/science/acceleratorsText duplicate Accelerators
/science/accelerators/accelera...CERN's accelerators
/science/accelerators/antiprot...The Antiproton Decelerator
/science/accelerators/large-ha...Text duplicate The Large Hadron Collider
/science/accelerators/high-lum...High-Luminosity LHC
/science/acceleratorsText duplicate + More
/science/engineeringText duplicate Engineering
/science/engineering/accelerat...Accelerating: radiofrequency cavities
/science/engineering/pulling-t...Steering and focusing: magnets and superconductivity
/science/engineering/vacuum-em...Circulating: ultra-high vacuum
/science/engineering/cryogenic...Cooling: cryogenic systems
/science/engineering/powering-...Powering: energy at CERN
/science/engineeringText duplicate + More
/science/computingText duplicate Computing
/science/computing/data-centreThe CERN Data Centre
/science/computing/gridThe Worldwide LHC Computing Grid
/science/computing/cern-openlabCERN openlab
/science/computing/open-source...Open source for open science
/science/computing/birth-webThe birth of the web
/science/computingText duplicate + More
/science/experimentsText duplicate Experiments
/science/experiments/aliceALICE
/science/experiments/atlasATLAS
/science/experiments/cmsCMS
/science/experiments/lhcbLHCb
/science/experimentsText duplicate + More
/resources/courier/physics/cer...No Text
/resources/courier/physics/cer...CERN Courier Sep/Oct 2024
A-TITLE CERN Courier Sep/Oct 2024
/resources/image/accelerators/...No Text
/resources/image/accelerators/...High-Luminosity LHC images
A-TITLE High-Luminosity LHC images
/resources/brochure/knowledge-...No Text
/resources/brochure/knowledge-...LHC Facts and Figures
A-TITLE LHC Facts and Figures
https://home.cern/resourcesSee all resources
/resources?topic=1114Text duplicate Accelerators
/resources?topic=1118Text duplicate At CERN
/resources?topic=1116Text duplicate Computing
/resources?topic=1115Text duplicate Engineering
/resources?topic=1117Text duplicate Experiments
/resources?topic=1119Text duplicate Knowledge sharing
/resources?topic=1113Text duplicate Physics
/resources?type=62360 image
/resources?type=53Annual report
/resources?type=56Brochure
/resources/bulletin/cern/cern-...Bulletin
/resources?type=52Courier
/resources?type=59Image
/resources?type=61Video
https://home.cern/resourcesText duplicate + More
/resources?audience=24CERN community
/resources?audience=21Educators
/resources?audience=23General public
/resources?audience=17Industry
/resources/audience/resources-...Media
/resources?audience=19Text duplicate Scientists
/resources?audience=20Students
https://home.cern/resourcesText duplicate + More
https://home.cern/en
https://home.cern/frfr
https://cern.ch/series-cern70External Read more →
https://cern.ch/highlight-expe...External Text duplicate Read more →
https://cern.ch/highlight-updatesExternal Text duplicate Read more →
https://cern.ch/highlight-anno...External Text duplicate Read more →
/news/news/cern/cern-highlight...No Text
/news/news/cern/cern-highlight...CERN highlights in 2024 celebrating 70 years
A-TITLE CERN highlights in 2024 celebrating 70 years
/news/news/physics/measurement...No Text
/news/news/physics/measurement...The measurement of a lifetime
A-TITLE The measurement of a lifetime
/news/news/physics/lhcb-sheds-...No Text
/news/news/physics/lhcb-sheds-...LHCb sheds light on two pieces of the matter–...
A-TITLE LHCb sheds light on two pieces of the matter–antimatter puzzle
/news/news/accelerators/test-s...No Text
/news/news/accelerators/test-s...The test stand for the High-Luminosity LHC we...
A-TITLE The test stand for the High-Luminosity LHC welcomes its first magnets
/news/news/physics/tale-two-hi...No Text
/news/news/physics/tale-two-hi...A tale of two Higgs: CMS searches for the pro...
A-TITLE A tale of two Higgs: CMS searches for the production of Higgs boson pairs
/news/news/physics/alice-finds...No Text
/news/news/physics/alice-finds...ALICE finds first ever evidence of the antima...
A-TITLE ALICE finds first ever evidence of the antimatter partner of hyperhelium-4
/news/press-release/physics/cl...No Text
/news/press-release/physics/cl...Text duplicate CLOUD experiment resolves puzzle of new aeros...
A-TITLE CLOUD experiment resolves puzzle of new aerosol particles in upper troposphere
/news/news/engineering/cern-si...No Text
/news/news/engineering/cern-si...Text duplicate CERN signs long-term solar power agreements
A-TITLE CERN signs long-term solar power agreements
/news/news/cern/cern-launches-...No Text
/news/news/cern/cern-launches-...Text duplicate CERN launches Resonance, a new arts collabora...
A-TITLE CERN launches Resonance, a new arts collaboration with the Republic and Canton of Geneva and the City of Geneva
https://home.cern/newsView all news
https://visit.cern/External No Text
https://visit.cern/External Plan your CERN visit
A-TITLE Plan your CERN visit
/science/accelerators/accelera...No Text
/science/accelerators/accelera...Take an immersive tour of CERN's accelerators
A-TITLE Take an immersive tour of CERN's accelerators
https://educational-resources....External Subdomain No Text
https://educational-resources....External Subdomain Explore CERN's educational resources
A-TITLE Explore CERN's educational resources
/about/what-we-do/environmenta...No Text
/about/what-we-do/environmenta...CERN and the environment
A-TITLE CERN and the environment
/about/what-we-do/our-impactNo Text
/about/what-we-do/our-impactTechnology from CERN to society
A-TITLE Technology from CERN to society
/events/exhibitions-training-e...Exhibitions training: ELISA-Guides
A-TITLE Exhibitions training: ELISA-Guides
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/exhibitions-training-e...Text duplicate Exhibitions training: ELISA-Guides
A-TITLE Exhibitions training: ELISA-Guides
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/acat-iac-meetingACAT IAC Meeting
A-TITLE ACAT IAC Meeting
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/nuclear-shape-and-bsm-...Nuclear Shape and BSM Searches at Colliders
A-TITLE Nuclear Shape and BSM Searches at Colliders
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/fpga-programming-using...FPGA Programming Using LabVIEW - Hands-On Workshop
A-TITLE FPGA Programming Using LabVIEW - Hands-On Workshop
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/advances-spectral-dens...Advances in spectral density estimations for lattice gauge theories...
A-TITLE Advances in spectral density estimations for lattice gauge theories
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/talk-einan-gardiTalk by Einan Gardi
A-TITLE Talk by Einan Gardi
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/introduction-course-gu...Introduction course for guides
A-TITLE Introduction course for guides
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/eft-combination-sm-mea...EFT combination of SM measurements
A-TITLE EFT combination of SM measurements
https://indico.cern.ch/export/...New window External Subdomain No Text
https://home.cern/eventsView all events
/science/physics/higgs-bosonNo Text
/science/physics/higgs-bosonText duplicate The Higgs boson
A-TITLE The Higgs boson
/science/accelerators/large-ha...No Text
/science/accelerators/large-ha...Text duplicate The Large Hadron Collider
A-TITLE The Large Hadron Collider
/science/physics/antimatterNo Text
/science/physics/antimatterText duplicate Antimatter
A-TITLE Antimatter
/science/computing/birth-webNo Text
/science/computing/birth-webThe birth of the Web
A-TITLE The birth of the Web
/science/physics/w-boson-sunsh...No Text
/science/physics/w-boson-sunsh...W boson
A-TITLE W boson
/science/physics/z-bosonNo Text
/science/physics/z-bosonZ boson
A-TITLE Z boson
http://www.facebook.com/cernExternal Subdomain IMG-ALT Facebook icon
http://www.instagram.com/cernExternal Subdomain IMG-ALT Instagram icon
https://www.tiktok.com/@cern_o...External Subdomain IMG-ALT TikTok icon
https://x.com/CERNExternal IMG-ALT X icon
http://www.linkedin.com/compan...External Subdomain IMG-ALT LinkedIn icon
http://www.youtube.com/user/ce...External Subdomain IMG-ALT Youtube icon
https://linktr.ee/CERN_officialNew window External More Social Media Accounts
https://home.cern/contactContact us
https://home.cern/directionsGetting here
http://cern.ch/procurementExternal Doing business with CERN
https://cern.ch/knowledgetransferExternal Knowledge transfer
https://voisins.web.cern.ch/enExternal Subdomain CERN's neighbours
https://cernandsocietyfoundati...External CERN & Society Foundation
https://home.cern/partnershipsPartnerships
https://alumni.cern/External Alumni
https://careers.cern/External Careers
https://visit.cern/External Visits
/data-privacy-protection-policyPrivacy policy
https://home.cern/cookiesCookie Management
https://copyright.web.cern.ch/External Subdomain Copyright

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://home.cern/"
HTTP header
(Important)
No X-Powered HTTP header is sent.
This page uses GZip for compressed data transmission.
Performance
(Somewhat important)
This page loads 67 CSS files. This may affect the page load time negatively.
This page loads 56 JavaScript files. This may affect the load time negatively.
The page response time is excellent with 0.13 seconds.
The file size of the HTML document is fine (157 kB).

HTTP Response Header

NameValue
servernginx
content-typetext/html; charset=UTF-8
transfer-encodingchunked
varyAccept-Encoding
cache-controlmax-age=60, public
dateFri, 20 Dec 2024 20:40:50 GMT
x-drupal-dynamic-cacheUNCACHEABLE
content-languageen
x-content-type-optionsnosniff
x-frame-optionsSAMEORIGIN
expiresSun, 19 Nov 1978 05:00:00 GMT
last-modifiedFri, 20 Dec 2024 20:40:50 GMT
etagW/"1734727250"
x-generatorDrupal 10 (https://www.drupal.org)
content-encodinggzip
set-cookie106 Characters
statuscode200
http_versionHTTP/1.1

External factors

This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 14,647 referring domains.
This page has 2,457,448 backlinks.
This page has backlinks from 10,235 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

#
# robots.txt
#
# This file is to prevent the crawling and indexing of certain parts
# of your site by web crawlers and spiders run by sites like Yahoo!
# and Google. By telling these "robots" where not to go on your site,
# you save bandwidth and server resources.
#
# This file will be ignored unless it is at the root of your host:
# Used:    http://example.com/robots.txt
# Ignored: http://example.com/site/robots.txt
#
# For more information about the robots.txt standard, see:
# http://www.robotstxt.org/robotstxt.html

User-agent: *
# CSS, JS, Images
Allow: /core/*.css$
Allow: /core/*.css?
Allow: /core/*.js$
Allow: /core/*.js?
Allow: /core/*.gif
Allow: /core/*.jpg
Allow: /core/*.jpeg
Allow: /core/*.png
Allow: /core/*.svg
Allow: /profiles/*.css$
Allow: /profiles/*.css?
Allow: /profiles/*.js$
Allow: /profiles/*.js?
Allow: /profiles/*.gif
Allow: /profiles/*.jpg
Allow: /profiles/*.jpeg
Allow: /profiles/*.png
Allow: /profiles/*.svg
# Directories
Disallow: /core/
Disallow: /profiles/
# Files
Disallow: /README.md
Disallow: /composer/Metapackage/README.txt
Disallow: /composer/Plugin/ProjectMessage/README.md
Disallow: /composer/Plugin/Scaffold/README.md
Disallow: /composer/Plugin/VendorHardening/README.txt
Disallow: /composer/Template/README.txt
Disallow: /modules/README.txt
Disallow: /sites/README.txt
Disallow: /themes/README.txt
Disallow: /web.config
# Paths (clean URLs)
Disallow: /admin/
Disallow: /comment/reply/
Disallow: /filter/tips
Disallow: /node/add/
Disallow: /search/
Disallow: /user/register
Disallow: /user/password
Disallow: /user/login
Disallow: /user/logout
Disallow: /media/oembed
Disallow: /*/media/oembed
# Paths (no clean URLs)
Disallow: /index.php/admin/
Disallow: /index.php/comment/reply/
Disallow: /index.php/filter/tips
Disallow: /index.php/node/add/
Disallow: /index.php/search/
Disallow: /index.php/user/password
Disallow: /index.php/user/register
Disallow: /index.php/user/login
Disallow: /index.php/user/logout
Disallow: /index.php/media/oembed
Disallow: /index.php/*/media/oembed
Crawl-Delay: 20

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home.cern
Home | CERN
CERN, the European Organization for Nuclear Research, is one of the world’s largest and most respected centres for scientific research. Its business is fundamental physics, finding out what the Universe is made of and how it works.

Most important keywords

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

KeywordResultRecheck
CERN87%Check
CERN society63%Check
CERN Community61%Check
science54%Check
search54%Check
fundamental51%Check
world51%Check
universe51%Check
Accelerating50%Check
Large50%Check
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