Home.cern - SEO Checker

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Overview of the SEO Check
Meta information
66% 
Page quality
74% 
Page structure
29% 
Link structure
16% 
Server
54% 
External factors
100% 
SEO Score
Response time
0.14 s
File size
155.30 kB
Words
847
Media files
8
Number of links
171 internal / 32 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Home | CERN
The page title is too short. (127 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: 1429 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: Switzerland
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

Automatically check home.cern including all subpages at once!

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Page quality

Content
(Critically important)
The average number of words per sentence of 31.5 words is high.
This page contains 847 words. That's ok.
25.5% 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.
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)
The usage of strong and bold tags is perfect. We recommend the use of up to 17 tags for this page.
Image SEO
(Somewhat important)
Alt text (alternative text) is correctly used on all found images.
Social Networks
(Nice to have)
This page is optimized perfectly for social networks.
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 AI enhances Higgs boson’s charm
H3 Chile to become an Associate Member State of ...
H3 Ireland to become an Associate Member State o...
H3 ALICE detects the conversion of lead into gol...
H3 CERN Courier May/Jun 2025
H3 High-Luminosity LHC images
H3 LHC Facts and Figures
H3 ALICE eyes the cosmos
H3 CERN and ESA: a decade of innovation
H3 CERN expands its collaboration on the Einstei...
H3 AI enhances Higgs boson’s charm Duplicate text
H3 Chile to become an Associate Member State of ... Duplicate text
H3 How imagining life on exoplanets sparks real-...
H3 Ireland to become an Associate Member State o... Duplicate text
H3 ALICE detects the conversion of lead into gol... Duplicate text
H3 And they’re off! The 2025 LHC physics season ...
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 Boosted Higgs measurements [CMS, TH]
H3 Gravitational-wave emission from binary systems of compact objects ...
H3 No seminar - HEFT Workshop
H3 Making Neutron Stars a Laboratory for New Physics
H3 Exploring Collective Dynamics in Small Collision Systems with ALICE...
H3 Library Science Talk - Preserving Knowledge in a Shifting World: Th...
H3 Gustavo Ramírez Hidalgo
H3 Neutron Stars – Nature’s most extreme laboratory
H3 Christiane Scherb TBD
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 (32) 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/news/physics/ai-enhances...No Text
/news/news/physics/ai-enhances...AI enhances Higgs boson’s charm
A-TITLE AI enhances Higgs boson’s charm
/news/press-release/cern/chile...No Text
/news/press-release/cern/chile...Chile to become an Associate Member State of ...
A-TITLE Chile to become an Associate Member State of CERN
/news/press-release/cern/irela...No Text
/news/press-release/cern/irela...Ireland to become an Associate Member State o...
A-TITLE Ireland to become an Associate Member State of CERN
/news/news/physics/alice-detec...No Text
/news/news/physics/alice-detec...ALICE detects the conversion of lead into gol...
A-TITLE ALICE detects the conversion of lead into gold at the LHC
/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 May/Jun 2025
A-TITLE CERN Courier May/Jun 2025
/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/highlight-updatesExternal Read more →
https://cern.ch/highlight-anno...External Text duplicate Read more →
https://cern.ch/highlight-expe...External Text duplicate Read more →
/news/news/physics/alice-eyes-...No Text
/news/news/physics/alice-eyes-...ALICE eyes the cosmos
A-TITLE ALICE eyes the cosmos
/news/news/knowledge-sharing/c...No Text
/news/news/knowledge-sharing/c...CERN and ESA: a decade of innovation
A-TITLE CERN and ESA: a decade of innovation
/news/news/knowledge-sharing/c...No Text
/news/news/knowledge-sharing/c...CERN expands its collaboration on the Einstei...
A-TITLE CERN expands its collaboration on the Einstein Telescope
/news/news/physics/ai-enhances...No Text
/news/news/physics/ai-enhances...Text duplicate AI enhances Higgs boson’s charm
A-TITLE AI enhances Higgs boson’s charm
/news/press-release/cern/chile...No Text
/news/press-release/cern/chile...Text duplicate Chile to become an Associate Member State of ...
A-TITLE Chile to become an Associate Member State of CERN
/news/news/cern/how-imagining-...No Text
/news/news/cern/how-imagining-...How imagining life on exoplanets sparks real-...
A-TITLE How imagining life on exoplanets sparks real-world solutions
/news/press-release/cern/irela...No Text
/news/press-release/cern/irela...Text duplicate Ireland to become an Associate Member State o...
A-TITLE Ireland to become an Associate Member State of CERN
/news/news/physics/alice-detec...No Text
/news/news/physics/alice-detec...Text duplicate ALICE detects the conversion of lead into gol...
A-TITLE ALICE detects the conversion of lead into gold at the LHC
/news/news/accelerators/and-th...No Text
/news/news/accelerators/and-th...And they’re off! The 2025 LHC physics season ...
A-TITLE And they’re off! The 2025 LHC physics season gets underway
/news?audience=23View more 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/boosted-higgs-measurem...Boosted Higgs measurements [CMS, TH]
A-TITLE Boosted Higgs measurements [CMS, TH]
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/gravitational-wave-emi...Gravitational-wave emission from binary systems of compact objects ...
A-TITLE Gravitational-wave emission from binary systems of compact objects
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/no-seminar-heft-workshopNo seminar - HEFT Workshop
A-TITLE No seminar - HEFT Workshop
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/making-neutron-stars-l...Making Neutron Stars a Laboratory for New Physics
A-TITLE Making Neutron Stars a Laboratory for New Physics
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/exploring-collective-d...Exploring Collective Dynamics in Small Collision Systems with ALICE...
A-TITLE Exploring Collective Dynamics in Small Collision Systems with ALICE at the LHC
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/library-science-talk-p...Library Science Talk - Preserving Knowledge in a Shifting World: Th...
A-TITLE Library Science Talk - Preserving Knowledge in a Shifting World: The Role of Libraries in Geopolitical Uncertainty
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/gustavo-ramirez-hidalgoGustavo Ramírez Hidalgo
A-TITLE Gustavo Ramírez Hidalgo
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/neutron-stars-natures-...Neutron Stars – Nature’s most extreme laboratory
A-TITLE Neutron Stars – Nature’s most extreme laboratory
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/christiane-scherb-tbdChristiane Scherb TBD
A-TITLE Christiane Scherb TBD
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/old-larg...No Text
/science/accelerators/old-larg...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.
The web server transmits the web page (HTML) in compressed form.
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 0.14 seconds.
The file size of the HTML document is fine (155 kB).

HTTP Response Header

NameValue
servernginx
content-typetext/html; charset=UTF-8
transfer-encodingchunked
varyAccept-Encoding
cache-controlmax-age=60, public
dateThu, 05 Jun 2025 03:37:23 GMT
x-drupal-dynamic-cacheUNCACHEABLE (poor cacheability)
content-languageen
x-content-type-optionsnosniff
x-frame-optionsSAMEORIGIN
expiresSun, 19 Nov 1978 05:00:00 GMT
last-modifiedThu, 05 Jun 2025 03:37:23 GMT
etagW/"1749094643"
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 6,026 referring domains.
This page has 510,383 backlinks.
This page has backlinks from 4,038 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
CERN95%Check
CERN society71%Check
CERN Community66%Check
world55%Check
science54%Check
Physics54%Check
fundamental51%Check
universe51%Check
Accelerating50%Check
Large50%Check
Show more keywords and terms

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