Atlas.cern - SEO Checker

Overview of the SEO Check
Meta information
100% 
Page quality
40% 
Page structure
70% 
Link structure
66% 
Server
54% 
External factors
100% 
SEO Score
Response time
0.13 s
File size
54.80 kB
Words
194
Media files
13
Number of links
70 internal / 17 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
ATLAS Experiment at CERN | ATLAS Experiment at CERN
There are word repetitions in the page title.
The length of the page title is perfect. (525 pixels out of 580 max pixel length)
Meta description
(Critically important)
Official public website for the ATLAS Experiment at CERN
The length of the meta description is perfect. (355 pixels out of 1000 max pixel length)
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
https://atlas.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
google-site-verificationLnSC4eOPWgFs8j_slMqfJnEqqbIFAa4_yMmG2B_ZfUw
GeneratorDrupal 10 (https://www.drupal.org)
MobileOptimizedwidth
HandheldFriendlytrue
viewportwidth=device-width, initial-scale=1.0
descriptionOfficial public website for the ATLAS Experiment at CERN
keywordsATLAS, ATLAS experiment, The ATLAS Experiment, CERN, LHC, Large Hadron Collider, CMS, ALICE, LHCb, experiment, collaboration, international collaboration, scientific collaboration, particle, physics, particle physics, high-energy physics, science, science education, Higgs, SUSY, supersymmetry, dark matter, big bang, extra dimensions, heavy ion, hadron, black hole, universe, STEM, Geneva, Switzerland, Fabiola Gianotti, Peter Jenni, David Charlton, Karl Jakobs, Andreas Hoecker
langen
og:site_nameATLAS Experiment at CERN
charsetutf-8

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Page quality

Content
(Critically important)
There are only 194 words on this page. Use at least 250 words to provide useful information.
Words from the H1 heading are not used in the page content.
No paragraphs were detected.
15.5% of the text are stop words.
The page contains a listing, which indicates a good text layout.
No placeholders texts or images were found.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
This page loads 60 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 6 tags for this page.
Image SEO
(Somewhat important)
3 images have no alt attribute. The content of alt attributes is used by search engines.
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.

Page structure

H1 heading
(Critically important)
CERN Accelerating science
Too many H1 headings
Headings
(Important)
The heading structure is perfect.

Heading structure

Heading levelContent
H1 CERN Accelerating science
H1 Latest News
H1 Discover the ATLAS Experiment
H1 Learn about LHC Run 3
H2 Main navigation
H2 Search
H3 ATLAS sets record limits on Higgs self-interaction using Run 3 data
H3 Studying the Higgs boson across the scales
H3 Shedding light with jets from the dark side
H3 The Detector
H3 The Physics
H3 The Collaboration
H3 LHC Run 3
H3 Long Shutdown 2
H3 Live Events
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.
11 links don't have an anchor text.
The number of internal links is ok.
None of the anchor texts is too long.
There are 17 external links on this page.
LinkAttributesAnchor text
https://atlas.cern/Anchor Skip to main content
https://home.cern/External 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://atlas.cern/IMG-ALT home
A-TITLE Home
https://cern.ch/atlas-collabor...External Collaboration Site
https://twiki.cern.ch/twiki/bi...External Subdomain Physics Results
https://atlas.cern/aboutAbout
A-TITLE Learn more about the ATLAS Experiment
/discover/detectorDiscover
/discover/detectorDetector
A-TITLE Learn more about the ATLAS detector and technology
/Discover/Detector/Long-Shutdo...Long Shutdown 2
/Discover/PhysicsPhysics
A-TITLE Learn more about the Physics of ATLAS and the LHC
/discover/collaborationCollaboration
A-TITLE Learn more about the ATLAS Collaboration
/Discover/Collaboration/Manage...Management
A-TITLE ATLAS Management
/Discover/Collaboration/AwardsAwards
/Discover/Collaboration/JoinJoin ATLAS
/Discover/Collaboration/Join/C...Join as a Clustered Institution
/Discover/Collaboration/Join/T...Join as a Technical Associate Institute
/Discover/Collaboration/Join/A...Join as an Associate Institute
/Discover/Collaboration/Join/I...Join as an Institution
https://atlas.cern/Discover/VisitVisit
https://atlas.cern/ResourcesResources
/Resources/PressPress
A-TITLE Resources for the Press
/Resources/Run-3Run 3 Resources
https://atlas.cern/updatesUpdates
https://atlas.cern/updatesAll
A-TITLE All Updates
https://atlas.cern/Updates/SearchAll Search
https://atlas.cern/Updates/NewsNews
A-TITLE ATLAS News
/Updates/News/SearchNews Search
/Updates/BriefingBriefings
A-TITLE ATLAS Physics and Experiment Briefings
/Updates/Briefing/SearchBriefings Search
/Updates/FeatureFeatures
A-TITLE Feature Articles
/Updates/Feature/SearchFeatures Search
/Updates/PortraitPortraits
A-TITLE Portraits
/Updates/Portrait/SearchPortraits Search
/Updates/ProfileProfiles
A-TITLE Profiles
/Updates/Profile/SearchProfiles Search
/Updates/Press-StatementText duplicate Press
A-TITLE ATLAS Press Statements
/Updates/Press-Statement/SearchPress Search
https://atlas.cern/Updates/BlogBlog
A-TITLE Blog Entries
/Updates/Blog/SearchBlog Search
https://atlas.cern/feedbackFeedback
/Updates/Briefing/Higgs-Self-I...No Text
/Updates/Briefing/Higgs-Self-I...No Text
/Updates/Briefing/Higgs-Self-I...ATLAS sets record limits on Higgs self-interaction using Run 3 data
/physics-briefingPhysics Briefing
/Updates/Briefing/Higgs-Across...No Text
/Updates/Briefing/Higgs-Across...No Text
/Updates/Briefing/Higgs-Across...Studying the Higgs boson across the scales
/physics-briefingText duplicate Physics Briefing
/Updates/Briefing/Shedding-Lig...No Text
/Updates/Briefing/Shedding-Lig...No Text
/Updates/Briefing/Shedding-Lig...Shedding light with jets from the dark side
/physics-briefingText duplicate Physics Briefing
https://atlas.cern/updatesSee more
A-TITLE See more
/discover/detectorNo Text
/discover/detectorThe Detector
A-TITLE The Detector
https://atlas.cern/physicsNo Text
https://atlas.cern/physicsThe Physics
A-TITLE The Physics
/discover/collaborationNo Text
/discover/collaborationThe Collaboration
A-TITLE The Collaboration
/Resources/Run-3No Text
/Resources/Run-3LHC Run 3
A-TITLE LHC Run 3
/Discover/Detector/Long-Shutdo...No Text
/Discover/Detector/Long-Shutdo...Text duplicate Long Shutdown 2
A-TITLE Long Shutdown 2
https://home.cern/news/news/ce...External No Text
https://home.cern/news/news/ce...External Live Events
A-TITLE Live Events
/resources/pressText duplicate Press
https://atlas.cern/visitText duplicate Visit
https://atlas.cern/jobsJobs
https://atlas.cern/joinCollaboration membership
https://atlas.cern/glossaryGlossary
https://atlas.cern/designLogo & design guidelines
https://atlas.cern/diversityDiversity & Inclusion
https://cern.ch/atlas-collabor...External Text duplicate Collaboration Site
https://twiki.cern.ch/twiki/bi...External Subdomain Text duplicate Physics Results
https://www.youtube.com/c/ATLA...External Subdomain IMG-ALT youtube
https://facebook.com/ATLASexpe...External IMG-ALT facebook
https://bsky.app/profile/atlas...External IMG-ALT bluesky
https://instagram.com/ATLASExp...External IMG-ALT instagram
https://www.tiktok.com/@atlase...External Subdomain IMG-ALT tiktok
https://twitter.com/ATLASexper...External IMG-ALT twitter
https://www.facebook.com/ATLAS...External Subdomain IMG-ALT Ukraine
https://atlas.cern/contactInquiries
https://atlaspo.cern.ch/public...External Subdomain Organisational chart
https://home.cern/New window External IMG-ALT CERN
A-TITLE CERN
https://atlas.cern/copyrightATLAS Experiment ©

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://atlas.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 82 CSS files. This may affect the page load time negatively.
This page loads 60 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 (55 kB).

HTTP Response Header

NameValue
servernginx
content-typetext/html; charset=UTF-8
transfer-encodingchunked
varyAccept-Encoding
cache-controlmust-revalidate, no-cache, private
dateThu, 26 Jun 2025 00:30:12 GMT
x-drupal-dynamic-cacheUNCACHEABLE (poor cacheability)
content-languageen
x-content-type-optionsnosniff
x-frame-optionsSAMEORIGIN
expiresSun, 19 Nov 1978 05:00:00 GMT
x-generatorDrupal 10 (https://www.drupal.org)
x-drupal-cacheHIT
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 611 referring domains.
This page has 4,241 backlinks.
This page has backlinks from 479 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

atlas.cern
ATLAS Experiment at CERN | ATLAS Experiment at CERN
Official public website for the ATLAS Experiment at CERN

Most important keywords

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

KeywordResultRecheck
CERN89%Check
ATLAS79%Check
ATLAS Experiment CERN78%Check
ATLAS Experiment72%Check
Experiment62%Check
Join as58%Check
Accelerating50%Check
science50%Check
Site48%Check
Run43%Check

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