Home.cern - SEO Checker

Overview of the SEO Check
Meta information
66% 
Page quality
52% 
Page structure
29% 
Link structure
16% 
Server
54% 
External factors
100% 
SEO Score
Response time
0.13 s
File size
155.70 kB
Words
838
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. (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

Test up to 1.000 webpages of home.cern with our free plan!

Try For Free
No trial. It's just free!

Page quality

Content
(Critically important)
The average number of words per sentence of 39 words is high.
This page contains 838 words. That's ok.
21.8% 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.
4 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 following tag is repeated too often: ends:
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.

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 Swiss artist Amanda E. Metzger selected for t...
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 Courier Jan/Feb 2025
H3 High-Luminosity LHC images
H3 LHC Facts and Figures
H3 The other 99%
H3 Official launch of the Quantum Year
H3 Swiss artist Amanda E. Metzger selected for t... Duplicate text
H3 At the World Economic Forum 2025
H3 AI treatments for stroke survivors
H3 Clocking nature’s heaviest elementary particl...
H3 GaToroid - getting closer to affordable cance...
H3 Happy 2025 from CERN
H3 CERN highlights in 2024 celebrating 70 years
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 $t\bar{t}$ + heavy flavour [ATLAS,TH]
H3 Winter School on Quantum Computing Quantum and Information
H3 Visit Point Training: AD
H3 UAntwerpen honours students
H3 Lab workshop training: Superconductivity
H3 156th Meeting of the SPSC
H3 Talk by Max Hübner
H3 Hessian-Free Force-Gradient Integrators for Lattice QCD Simulations...
H3 Visit Point training: CCC
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.
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/cern/swiss-artist-a...No Text
/news/news/cern/swiss-artist-a...Swiss artist Amanda E. Metzger selected for t...
A-TITLE Swiss artist Amanda E. Metzger selected for the Connect residency
/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?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 Jan/Feb 2025
A-TITLE CERN Courier Jan/Feb 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/quantum-yearExternal Read more →
https://cern.ch/highlight-anno...External Text duplicate Read more →
https://cern.ch/highlight-updatesExternal Text duplicate Read more →
/news/news/physics/other-99No Text
/news/news/physics/other-99The other 99%
A-TITLE The other 99%
/news/news/knowledge-sharing/o...No Text
/news/news/knowledge-sharing/o...Official launch of the Quantum Year
A-TITLE Official launch of the Quantum Year
/news/news/cern/swiss-artist-a...No Text
/news/news/cern/swiss-artist-a...Text duplicate Swiss artist Amanda E. Metzger selected for t...
A-TITLE Swiss artist Amanda E. Metzger selected for the Connect residency
/news/news/knowledge-sharing/w...No Text
/news/news/knowledge-sharing/w...At the World Economic Forum 2025
A-TITLE At the World Economic Forum 2025
/news/news/knowledge-sharing/a...No Text
/news/news/knowledge-sharing/a...AI treatments for stroke survivors
A-TITLE AI treatments for stroke survivors
/news/news/physics/clocking-na...No Text
/news/news/physics/clocking-na...Clocking nature’s heaviest elementary particl...
A-TITLE Clocking nature’s heaviest elementary particle
/news/news/knowledge-sharing/g...No Text
/news/news/knowledge-sharing/g...GaToroid - getting closer to affordable cance...
A-TITLE GaToroid - getting closer to affordable cancer therapy
/news/news/cern/happy-2025-cernNo Text
/news/news/cern/happy-2025-cernHappy 2025 from CERN
A-TITLE Happy 2025 from CERN
/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
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/tbart-heavy-flavour-at...$t\bar{t}$ + heavy flavour [ATLAS,TH]
A-TITLE $t\bar{t}$ + heavy flavour [ATLAS,TH]
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/winter-school-quantum-...Winter School on Quantum Computing Quantum and Information
A-TITLE Winter School on Quantum Computing Quantum and Information
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/visit-point-training-ad-0Visit Point Training: AD
A-TITLE Visit Point Training: AD
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/uantwerpen-honours-stu...UAntwerpen honours students
A-TITLE UAntwerpen honours students
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/lab-workshop-training-...Lab workshop training: Superconductivity
A-TITLE Lab workshop training: Superconductivity
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/156th-meeting-spsc156th Meeting of the SPSC
A-TITLE 156th Meeting of the SPSC
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/talk-max-hubnerTalk by Max Hübner
A-TITLE Talk by Max Hübner
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/hessian-free-force-gra...Hessian-Free Force-Gradient Integrators for Lattice QCD Simulations...
A-TITLE Hessian-Free Force-Gradient Integrators for Lattice QCD Simulations
https://indico.cern.ch/export/...New window External Subdomain No Text
/events/visit-point-training-c...Visit Point training: CCC
A-TITLE Visit Point training: CCC
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 (156 kB).

HTTP Response Header

NameValue
servernginx
content-typetext/html; charset=UTF-8
transfer-encodingchunked
varyAccept-Encoding
cache-controlmax-age=60, public
dateThu, 06 Feb 2025 08:34:31 GMT
x-drupal-dynamic-cacheUNCACHEABLE
content-languageen
x-content-type-optionsnosniff
x-frame-optionsSAMEORIGIN
expiresSun, 19 Nov 1978 05:00:00 GMT
last-modifiedThu, 06 Feb 2025 08:34:31 GMT
etagW/"1738830871"
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 17,374 referring domains.
This page has 1,307,033 backlinks.
This page has backlinks from 10,286 different ip addresses.

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

Search preview

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
2025 CERN69%Check
CERN Community66%Check
world55%Check
science54%Check
Science and Technology52%Check
fundamental51%Check
universe51%Check
Accelerating50%Check

Test up to 1.000 webpages of home.cern with our free plan!

Try For Free
No trial. It's just free!

Cookie Policy

We use cookies to make our site work and also for analytics and advertising purposes. You can enable or disable optional cookies as desired. See the following links for more information.

We need these so the site can function properly

So we can better understand how visitors use our website

So we can serve you tailored ads and promotions