Esawebb.org - SEO Checker

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Overview of the SEO Check
Meta information
61% 
Page quality
54% 
Page structure
60% 
Link structure
52% 
Server
93% 
External factors
100% 
SEO Score
Response time
0.54 s
File size
131.10 kB
Words
431
Media files
25
Number of links
113 internal / 20 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
ESA/Webb
The page title is too short. (97 pixels of 580 max pixel length) Optimize title
There are no duplicate words in the title
Meta description
(Critically important)
The meta description is missing.
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is 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)
There are no alternate links specified on this page.
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
viewportwidth=device-width, initial-scale=1
google-site-verificationKTjYtxjG6PEMU6XMF7LY4nMnJ7MXxYaNzVY6SYTo1Qc
author[email protected]
langen
twitter:cardsummary
og:titleESA/Webb Space Telescope
og:descriptionThe ESA page for the James Webb Space Telescope, the space-based observatory that has revolutionised modern astronomy.
og:imagehttp://cdn.esawebb.org/archives/images/screen/ann2203a.jpg
og:image:secure_urlhttps://cdn.esawebb.org/archives/images/screen/ann2203a.jpg
X-UA-CompatibleIE=edge
charsetutf-8

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Page quality

Content
(Critically important)
No paragraphs were detected.
There are only 431 words on this page. Good pages should have about 800 words of useful content.
20.9% 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.
A viewport "width=device-width, initial-scale=1" is provided.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 9 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
/assets/images/esa-jwst-logo.pngESA/Webb logo
/assets/images/esa-logo.pngESA logo
/assets/images/esa-jwst-logo.pngESA logo
...archives/images/wallpaper1/weic2509a.jpgWebb uncovers possible hidden supermassive black hole in nearby spiral galaxy M83
...archives/images/wallpaper1/weic2508a.jpgDying star's energetic display comes into full focus
...archives/images/wallpaper1/weic2505a.jpgWebb sees galaxy is mysteriously clearing fog of early Universe
...archives/images/wallpaper1/weic2507a.jpgWebb captures Neptune's auroras for the first time
...archives/images/banner1920/weic2509a.jpgWebb uncovers possible hidden supermassive black hole in nearby spiral galaxy M83
...archives/images/banner1920/weic2508a.jpgDying star's energetic display comes into full focus
...archives/images/banner1920/weic2505a.jpgWebb sees galaxy is mysteriously clearing fog of early Universe
...archives/images/banner1920/weic2507a.jpgWebb captures Neptune's auroras for the first time
...imagecomparisons/wallpaper1/potm2504.jpgInfrared, optical, and X-ray views of a galaxy group
...archives/images/wallpaper1/potm2503a.jpgSpying a spiral through a cosmic lens
...archives/images/wallpaper1/potm2502a.jpgWebb visits a star-forming spiral
...archives/images/wallpaper1/potm2501a.jpgWebb investigates a dusty and dynamic disc
.../archives/images/wallpaper1/ann2403a.jpgCover page of the 2025 ESA/Hubble and ESA/Webb calendar
.../archives/images/wallpaper1/ann2402a.jpgESA/Hubble & ESA/Webb Science Writer
...archives/images/wallpaper1/weic2311a.jpgCassiopeia A (MIRI Image)
.../archives/images/wallpaper1/ann2303a.jpgCover page of the 2024 ESA/Hubble and ESA/Webb calendar
....org/archives/images/screen/ann2201a.jpgSPACE SPARKS VIDEO SERIES
....org/archives/images/screen/ann2203a.jpgESA/HUBBLE/WEBB SCIENCE NEWSLETTER
...org/archives/images/screen/weic2210a.jpgWEBB'S FIRST IMAGES RELEASE: JULY, 2022
...chives/images/screen/ESAHubbleWebb-1.jpgTake a look to our newsletters
.../archives/images/screen/Updates-from.jpgSuscribirse a Webb News

Page structure

H1 heading
(Critically important)
There is no H1 heading specified.
Headings
(Important)
Some headings occur twice on the page.
The structure of headings is missing one or more levels. Do not skip heading levels.
There are 26 headings on the page. The amount of headings should be in a more proper relation to the amount of text.

Heading structure

Heading levelContent
H4 Press Releases
H4 Picture of the Month
H4 Announcements
H4 SPACE SPARKS VIDEO SERIES
H4 ESA/HUBBLE/WEBB SCIENCE NEWSLETTER
H4 WEBB'S FIRST IMAGES RELEASE: JULY, 2022
H4 ESA/Webb Facebook
H4 ESA/Webb on Twitter
H4 ESA/Webb Copyright
H4 Subscribe to Webb News
H5 Webb uncovers possible hidden supermassive black hole in nearby spiral galaxy M83
H5 Dying star's energetic display comes into full focus
H5 Webb sees galaxy is mysteriously clearing fog of early Universe
H5 Webb captures Neptune's auroras for the first time
H5 Webb uncovers possible hidden supermassive black hole in nearby spiral galaxy M83 Duplicate text
H5 Dying star's energetic display comes into full focus Duplicate text
H5 Webb sees galaxy is mysteriously clearing fog of early Universe Duplicate text
H5 Webb captures Neptune's auroras for the first time Duplicate text
H5 Infrared, optical, and X-ray views of a galaxy group
H5 Spying a spiral through a cosmic lens
H5 Webb visits a star-forming spiral
H5 Webb investigates a dusty and dynamic disc
H5 Announcement of the 2025 ESA Hubble and Webb Calendar
H5 Call for ESA/Hubble & ESA/Webb Science Writer
H5 Royal Astronomical Society Group Achievement Award for JWST-MIRI Team
H5 Announcement of the 2024 ESA Hubble and Webb Calendar
Some anchor texts are used more than once.
1 links don't have an anchor text.
There are 12 links with a trivial anchor text.
The number of internal links is ok.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are 20 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://esawebb.org/IMG-ALT ESA/Webb logo
https://esahubble.org/subscribe/External Subscribe to Webb News
https://esawebb.org/search/No Text
https://www.esa.int/External Subdomain IMG-ALT ESA logo
https://esawebb.org/Home
https://esawebb.org/news/News
https://esawebb.org/news/Press Releases
/news/scientists/newsworthy-re...Newsworthy Results
/news/archive/year/2025/2025
/news/archive/year/2024/2024
/news/archive/year/2023/2023
/news/archive/year/2022/2022
/news/archive/year/2021/2021
/announcements/Announcements
/announcements/archive/year/2025/Text duplicate 2025
/announcements/archive/year/2024/Text duplicate 2024
/announcements/archive/year/2023/Text duplicate 2023
/announcements/archive/year/2022/Text duplicate 2022
https://esawebb.org/images/potm/Picture of the Month
/images/potm/archive/year/2025/Text duplicate 2025
/images/potm/archive/year/2024/Text duplicate 2024
/images/potm/archive/year/2023/Text duplicate 2023
/images/potm/archive/year/2022/Text duplicate 2022
https://esawebb.org/images/Images
https://esawebb.org/images/All images
https://esawebb.org/images/potm/Text duplicate Picture of the Month
https://esawebb.org/videos/Videos
/about/general/mision-overview/General
/about/general/mision-overview/Mission Overview
/about/general/fact-sheet/Fact Sheet
/about/instruments/miri/MIRI
/about/instruments/nirspec/NIRSpec
/about/instruments/nircam-niriss/NIRCam & NIRISS
/about/general/sun-shield/Sun Shield
/about/general/mirrors/Mirrors
/about/general/orbit/Orbit
/about/general/spectroscopy-wi...Spectroscopy with Webb
/about/general/webb-and-other-...Webb & Other Space Telescopes
/about/general/webb-scientific...Webb's Scientific Method
/about/general/image-processing/Image Processing
/about/webb-and-europe/interna...International Collaboration
/about/webb-europe/ariane-lauc...Ariane Launcher
/about/webb-europe/outreach-team/ESA/Webb Outreach Team
/about/science/other-worlds/Other Worlds
/about/science/lifecycle-of-st...The Lifecycle of Stars
/about/science/the-early-unive...The Early Universe
/about/science/galaxies-over-t...Galaxies Over Time
https://esawebb.org/about/faqFAQ
/news/scientists/newsworthy-re...Text duplicate Newsworthy Results
https://esawebb.org/initiatives/Initiatives
/initiatives/webbs-first-images/Webb's First Images
https://esawebb.org/wordbank/Word Bank
/initiatives/public-resources/Public Resources
/initiatives/public-resources/...Virtual Meeting Backgrounds
https://www.esa.int/About_Us/E...External Subdomain ESA Webb Seeing Farther Brochure
/products/calendars/Calendars
/products/calendars/archive/ye...Text duplicate 2025
/products/calendars/archive/ye...Text duplicate 2024
/products/calendars/archive/ye...Text duplicate 2023
https://esawebb.org/newsletters/ESA/Webb Newsletters
/newsletters/webbnews/ESA/Webb News
/newsletter/science/ESA/Hubble/Webb Science Newsletter
/forscientists/announcement/Science Announcements
/media-images-videos/Media
https://esawebb.org/copyright/Usage of ESA/Webb Images & Videos
/press-mailinglist/Subscribe to the Media Newsletter
https://esawebb.org/contact/Contact
https://www.facebook.com/ESAWebb/New window External Subdomain No Text
https://twitter.com/ESA_WebbNew window External No Text
https://www.instagram.com/esaw...New window External Subdomain No Text
https://www.youtube.com/user/H...New window External Subdomain No Text
https://www.linkedin.com/compa...New window External Subdomain No Text
https://www.flickr.com/photos/...New window External Subdomain No Text
https://giphy.com/esawebbNew window External No Text
https://esawebb.org/news/Text duplicate Press Releases
/news/weic2509/IMG-ALT Webb uncovers possible hidden supermassive black hole in nearby spiral galaxy M83
/news/weic2509/Text duplicate Webb uncovers possible hidden supermassive black hole in nearby spiral galaxy M83
/news/weic2509/Trivial anchor text
Read More
/news/weic2508/IMG-ALT Dying star's energetic display comes into full focus
/news/weic2508/Text duplicate Dying star's energetic display comes into full focus
/news/weic2508/Text duplicate Trivial anchor text
Read More
/news/weic2505/IMG-ALT Webb sees galaxy is mysteriously clearing fog of early Universe
/news/weic2505/Text duplicate Webb sees galaxy is mysteriously clearing fog of early Universe
/news/weic2505/Text duplicate Trivial anchor text
Read More
/news/weic2507/IMG-ALT Webb captures Neptune's auroras for the first time
/news/weic2507/Text duplicate Webb captures Neptune's auroras for the first time
/news/weic2507/Text duplicate Trivial anchor text
Read More
https://esawebb.org/news/Explore all Press Releases
/news/weic2509/Webb uncovers possible hidden supermassive black hole in nearby spiral galaxy M83 17 April 2025 — weic2509
IMG-ALT Webb uncovers possible hidden supermassive black hole in nearby spiral galaxy M83
/news/weic2508/Dying star's energetic display comes into full focus 14 April 2025 — weic2508
IMG-ALT Dying star's energetic display comes into full focus
/news/weic2505/Webb sees galaxy is mysteriously clearing fog of early Universe 26 March 2025 — weic2505
IMG-ALT Webb sees galaxy is mysteriously clearing fog of early Universe
/news/weic2507/Webb captures Neptune's auroras for the first time 26 March 2025 — weic2507
IMG-ALT Webb captures Neptune's auroras for the first time
https://esawebb.org/images/potm/Text duplicate Picture of the Month
/images/comparisons/potm2504/IMG-ALT Infrared, optical, and X-ray views of a galaxy group
/images/comparisons/potm2504/Text duplicate Infrared, optical, and X-ray views of a galaxy group
/images/comparisons/potm2504/Text duplicate Trivial anchor text
Read More
/images/potm2503a/IMG-ALT Spying a spiral through a cosmic lens
/images/potm2503a/Text duplicate Spying a spiral through a cosmic lens
/images/potm2503a/Text duplicate Trivial anchor text
Read More
/images/potm2502a/IMG-ALT Webb visits a star-forming spiral
/images/potm2502a/Text duplicate Webb visits a star-forming spiral
/images/potm2502a/Text duplicate Trivial anchor text
Read More
/images/potm2501a/IMG-ALT Webb investigates a dusty and dynamic disc
/images/potm2501a/Text duplicate Webb investigates a dusty and dynamic disc
/images/potm2501a/Text duplicate Trivial anchor text
Read More
/announcements/Text duplicate Announcements
/announcements/ann2403/IMG-ALT Cover page of the 2025 ESA/Hubble and ESA/Webb calendar
/announcements/ann2403/Announcement of the 2025 ESA Hubble and Webb Calendar
/announcements/ann2403/Text duplicate Trivial anchor text
Read More
/announcements/ann2402/IMG-ALT ESA/Hubble & ESA/Webb Science Writer
/announcements/ann2402/Call for ESA/Hubble & ESA/Webb Science Writer
/announcements/ann2402/Text duplicate Trivial anchor text
Read More
/announcements/ann2401/IMG-ALT Cassiopeia A (MIRI Image)
/announcements/ann2401/Royal Astronomical Society Group Achievement Award for JWST-MIRI Team
/announcements/ann2401/Text duplicate Trivial anchor text
Read More
/announcements/ann2303/IMG-ALT Cover page of the 2024 ESA/Hubble and ESA/Webb calendar
/announcements/ann2303/Announcement of the 2024 ESA Hubble and Webb Calendar
/announcements/ann2303/Text duplicate Trivial anchor text
Read More
/videos/archive/category/space...ESA/Webb Space Sparks
IMG-ALT SPACE SPARKS VIDEO SERIES
/newsletter/science/ESA/Hubble/JWST Science Newsletter - April 2022
IMG-ALT ESA/HUBBLE/WEBB SCIENCE NEWSLETTER
/initiatives/webbs-first-images/12 July 2022
IMG-ALT WEBB'S FIRST IMAGES RELEASE: JULY, 2022
https://twitter.com/ESA_Webb?r...External Tweets by ESA_Webb
https://esawebb.org/copyright/IMG-ALT Take a look to our newsletters
https://esawebb.org/newsletters/IMG-ALT Suscribirse a Webb News
https://www.facebook.com/ESAWebb/New window External Subdomain No Text
https://twitter.com/ESA_WebbNew window External No Text
https://www.instagram.com/esaw...New window External Subdomain No Text
https://www.youtube.com/user/H...New window External Subdomain No Text
https://www.linkedin.com/compa...New window External Subdomain No Text
https://www.flickr.com/photos/...New window External Subdomain No Text
https://giphy.com/esawebbNew window External No Text
https://www.encisosystems.com/External Subdomain Enciso Systems S.A
https://www.cdn77.com/External Subdomain Accelerated by CDN77

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://esawebb.org/"
HTTP header
(Important)
No X-Powered HTTP header is sent.
The web server transmits the web page (HTML) in compressed form.
Performance
(Somewhat important)
The page response time of 0.54 seconds is longer than the recommended limit of 0.4 seconds. A high response time unnecessarily slows down search engine crawling and results in bad user experience as well.
The file size of the HTML document is fine (131 kB).

HTTP Response Header

NameValue
dateSun, 11 May 2025 13:05:36 GMT
content-typetext/html; charset=utf-8
cf-ray93e1e38a7a3ad646-CDG
servercloudflare
content-encodingzstd
expiresSun, 11 May 2025 13:06:18 GMT
cache-controlmax-age=300
varyAccept-Encoding
access-control-allow-origin*
access-control-allow-methodsGET, POST, PUT, OPTIONS, HEAD, PATCH, DELETE
access-control-allow-headersAuthorization, Origin, X-Requested-With, Content-Type, Accept
cf-cache-statusDYNAMIC
server-timingcfCacheStatus;desc="DYNAMIC"
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http_versionHTTP/2

External factors

This website has excellent links from other websites.
This page has backlinks from 214 referring domains.
This page has 1,915 backlinks.
This page has backlinks from 190 different ip addresses.

Links from Wikipedia

No links from Wikipedia were found.

Robots.txt

No valid Robots.txt file was found.

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esawebb.org
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Most important keywords

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

KeywordResultRecheck
Webb61%Check
Hubble Webb50%Check
Webb News49%Check
Webb Space49%Check
Webb Science49%Check
Webb Calendar49%Check
Hubble Webb Science47%Check
Hubble46%Check
First Images45%Check
Science44%Check
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