Arb-silva.de - SEO Checker

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Overview of the SEO Check
Meta information
61% 
Page quality
80% 
Page structure
23% 
Link structure
96% 
Server
91% 
External factors
100% 
SEO Score
Response time
0.12 s
File size
26.20 kB
Words
711
Media files
25
Number of links
52 internal / 17 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Silva
The page title is too short. (45 pixels of 580 max pixel length) Optimize title
The page title is only one word.
There are no duplicate words in the title
Meta description
(Critically important)
The SILVA database project provides comprehensive, quality checked and regularly updated databases of aligned small (16S / 18S, SSU) and large subunit (23S / 28S, LSU) ribosomal RNA (rRNA) sequences for all three domains of life (Bacteria, Archaea and Eukarya).
The meta description is too long: 1660 pixels from max. 1000 pixels. Optimize description
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.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
generatorTYPO3 4.7 CMS
KEYWORDSSILVA,ARB,16S,23S,rRNA,SSU,LSU,ribosomal,RNA,database,alignment,bacteria,eukarya,archaea,18S,28S,soppi,living tree,MIxS,contextual data,taxonomy,sytematics
DESCRIPTIONThe SILVA database project provides comprehensive, quality checked and regularly updated databases of aligned small (16S / 18S, SSU) and large subunit (23S / 28S, LSU) ribosomal RNA (rRNA) sequences for all three domains of life (Bacteria, Archaea and Eukarya).
verify-v1sVJH2ce9rDnQ2h3gtRifay3EvUl2J/mV3k6VvQ1vWN0=
msapplication-TileColor#ffffff
msapplication-config/favicons/browserconfig.xml?v=2
theme-color#ffffff
langen
twitter:dnton
twitter:cardsummary
twitter:site@ARB_SILVA
twitter:titleSilva
twitter:descriptionThe SILVA database project provides comprehensive, quality checked and regularly updated databases of aligned small (16S / 18S, SSU) and large subunit (23S / 28S, LSU) ribosomal RNA (rRNA) sequences for all three domains of life (Bacteria, Archaea and Eukarya).
twitter:imagehttps://www.arb-silva.de/favicons/apple-touch-icon.png?v=2
Content-Typetext/html; charset=UTF-8

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Page quality

Content
(Critically important)
This page contains 711 words. That's ok.
23.9% of the text are stop words.
The page contains a listing, which indicates a good text layout.
13 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 18.28 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No viewpoint tag is provided.
At least one Apple touch icon is specified.
Bold and strong tags
(Somewhat important)
The amount of tags is very high (16). We recommend using a maximum of 14 tags for this page.
Some tags are too long. With 93 characters this one is longer than 70 characters:
"a comprehensive on-line resource for quality checked and aligned ribosomal rna sequence data."
The following tag is repeated too often: silva
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)
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
...cs_general/main/logos/silva-subtitle.svgSILVA logo
...ics_general/main/logos/GCBR-Logo-RGB.svgGlobal Core Biodata Resource
...ics_general/main/logos/CoreData_Logo.svgElixir Core Data Resource
...cs_general/main/logos/deNBI_Logo_rgb.svgde.NBI Logo
...gins/TYPO3Browsers/img/internal_link.gifOpens internal link in current window
/typo3temp/pics/e8f23b36b7.pngSILVAngs logo
/uploads/pics/silva_tree_web.pngSILVA logo
...accessibilityicons/img/internal_link.gifOpens internal link in current window
.../pics/treeviewer-icon-zoomed-tree_06.pngSILVA Tree Viewer
...tyicons/img/external_link_new_window.gifOpens external link in new window
/uploads/pics/ARB_tree_22.gifExample phylogenetic tree in radial format.
...rowsers/img/external_link_new_window.gifOpens external link in new window
/uploads/pics/UniEuk_web.pngUniEuk
...tyicons/img/external_link_new_window.gifOpens external link in new window
...tyicons/img/external_link_new_window.gifOpens external link in new window
/typo3temp/pics/c15529cf46.pngNo alt attribute provided
/uploads/pics/gbc-logo-thumb_01.pngNo alt attribute provided
...cs/dsmz-digital-diversity-tree.thumb.pngDSMZ Digital Diversity tree logo
/typo3temp/pics/8b7d9d7412.pngde.NBI
...tyicons/img/external_link_new_window.gifOpens external link in new window
/uploads/pics/arb-silva_de_v1_01.pngQR code
...tyicons/img/external_link_new_window.gifOpens external link in new window
...tyicons/img/external_link_new_window.gifOpens external link in new window
...accessibilityicons/img/internal_link.gifOpens internal link in current window
...admin/graphics_general/main/rss_icon.gifNo alt attribute provided

Page structure

H1 heading
(Critically important)
SILVA
Too many H1 headings
The H1 heading consists of only one word. There should be more information given.
The H1 heading is too short (5 characters). It should be at least 20 Characters long.
Headings
(Important)
The structure of headings is missing one or more levels. Do not skip heading levels.

Heading structure

Heading levelContent
H1 SILVA
H1 SILVAngs
H1 SILVA Alignment, Classification and Tree (ACT) Service
H1 SILVA Tree Viewer
H1 ARB
H1 UniEuk
H1 SILVA Terms of Use/License Information
H1 News
H1 User satisfaction survey
H1 SILVA SSU 138.2 update release
H1 Citations
H1 SILVA RSS Feed
H3 Welcome to the SILVA rRNA database project
H3 SILVA Release 138.2
H3 SILVA named Global Core Biodata Resource (GCBR)
H3 We are hiring!
H3 We need you!
Baselink: https://www.arb-silva.de
Some anchor texts are used more than once.
There are 1 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 17 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://www.arb-silva.de/IMG-ALT SILVA logo
https://globalbiodata.org/scie...New window External IMG-ALT Global Core Biodata Resource
https://www.elixir-europe.org/...New window External Subdomain IMG-ALT Elixir Core Data Resource
https://www.denbi.de/New window External Subdomain IMG-ALT de.NBI Logo
https://www.arb-silva.de/Subdomain Home
A-TITLE The ribosomal RNA Databases for ARB
https://www.arb-silva.de/ngs/SILVAngs
A-TITLE SILVAngs is a data analysis service for ribosomal RNA gene (rDNA) amplicon reads from high-throughput sequencing (next-generation sequencing (NGS)) approache...
https://www.arb-silva.de/browser/Browser
A-TITLE Browser
https://www.arb-silva.de/search/Search
https://www.arb-silva.de/search/Text duplicate Search
A-TITLE Search
https://www.arb-silva.de/aligner/Sequence Search
A-TITLE Sequence Search
/search/testprobe/TestProbe
A-TITLE TestProbe
/search/testprime/TestPrime
A-TITLE TestPrime
https://www.arb-silva.de/aligner/ACT
A-TITLE Alignment, Classification and Tree Service
/download/Download
/download/TaskManager
A-TITLE TaskManager
/download/arb-files/ARB files
A-TITLE ARB files
/download/archive/Archive
A-TITLE Archive
/documentation/Documentation
/documentation/Background
A-TITLE Background
/documentation/release-1382/Release 138.2
A-TITLE Release 138.2
/documentation/faqs/FAQs
A-TITLE FAQs
/documentation/silva-taxonomy/SILVA taxonomy
A-TITLE SILVA taxonomy
/documentation/search-tutorial/Search tutorial
A-TITLE Search tutorial
/documentation/act-tutorial/ACT tutorial
A-TITLE ACT tutorial
/documentation/testprobe-tutor...TestProbe tutorial
A-TITLE TestProbe tutorial
/documentation/testprime-tutor...TestPrime tutorial
A-TITLE TestPrime tutorial
/documentation/arb-support/ARB support
A-TITLE ARB support
https://www.arb-silva.de/contact/Publications
A-TITLE Publications
/projects/Projects
/projects/Overview
A-TITLE Overview
/projects/ssu-ref-nr/Ref NR
A-TITLE Ref NR
/projects/dsrabsilva/dsrAB@SILVA
A-TITLE dsrAB@SILVA
/projects/living-tree/Living Tree
A-TITLE Living Tree
/projects/soppi/SOPPI
A-TITLE SOPPI
/projects/eukaryotic-taxonomy/Eukaryotic Taxonomy
A-TITLE Eukaryotic Taxonomy
/projects/rrna-workshop/rRNA workshop
A-TITLE rRNA workshop
https://www.arb-silva.de/contact/Contact
https://www.arb-silva.de/contact/Address
A-TITLE Address
/contact/team/Team
A-TITLE Team
/documentation/IMG-ALT Opens internal link in current window
A-TITLE Opens internal link in current window
/documentation/Trivial anchor text
Click here
A-TITLE Opens internal link in current window
https://ngs.arb-silva.de/New window External Subdomain IMG-ALT SILVAngs logo
https://www.arb-silva.de/aligner/Text duplicate IMG-ALT SILVA logo
https://www.arb-silva.de/aligner/www.arb-silva.de/act
IMG-ALT Opens internal link in current window
A-TITLE Opens internal link in current window
/treeviewerNew window Subdomain IMG-ALT SILVA Tree Viewer
/treeviewerNew window Subdomain www.arb-silva.de/treeviewer
IMG-ALT Opens external link in new window
A-TITLE Opens the SILVA Tree Viewer in a new window
http://www.arb-home.de/External Subdomain IMG-ALT Example phylogenetic tree in radial format.
http://www.arb-home.de/New window External Subdomain www.arb-home.de.
IMG-ALT Opens external link in new window
A-TITLE Opens external link in new window
http://unieuk.org/New window External IMG-ALT UniEuk
http://unieuk.net/External Text duplicate UniEuk
IMG-ALT Opens external link in new window
A-TITLE Opens external link in new window
https://creativecommons.org/li...New window External Create Commons Attribution 4.0 (CC-BY 4.0)
IMG-ALT Opens external link in new window
A-TITLE Opens external link in new window
/news/view/2024/07/11/silva-re...SILVA Release 138.2
A-TITLE SILVA Release 138.2
/news/view/2023/12/11/silva-na...SILVA named Global Core Biodata Resource (GCBR)
A-TITLE SILVA named Global Core Biodata Resource (GCBR)
https://bacdive.dsmz.de/External Subdomain BacDive
https://brenda-enzymes.org/External BRENDA
https://lpsn.dsmz.de/External Subdomain LPSN
https://hub.dsmz.de/External Subdomain Anchor We are hiring!
A-TITLE We are hiring!
https://hub.dsmz.de/External Subdomain Anchor Trivial anchor text
here
/news/view/2023/09/14/we-need-...We need you!
A-TITLE We need you!
/news/archive/go to Archive ->
https://www.surveymonkey.de/r/...External Subdomain survey
IMG-ALT Opens external link in new window
A-TITLE Opens external link in new window
https://www.arb-silva.de/contact/IMG-ALT QR code
http://nar.oxfordjournals.org/...New window External Subdomain Nucl. Acids Res. 41 (D1): D590-D596.
IMG-ALT Opens external link in new window
A-TITLE SILVA Paper
http://nar.oxfordjournals.org/...New window External Subdomain Nucl. Acids Res. 42:D643-D648
IMG-ALT Opens external link in new window
A-TITLE Opens external link in new window
https://www.arb-silva.de/contact/Further references
IMG-ALT Opens internal link in current window
A-TITLE Opens internal link in current window
/news/rss.xmlRSS Feed
https://www.arb-silva.de/contact/Text duplicate Contact
/footer/imprint/Imprint
/footer/privacy-statement/Privacy Statement

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://www.arb-silva.de/"
HTTP header
(Important)
The web server version is sent within the HTTP header.
No X-Powered HTTP header is sent.
This page uses GZip for compressed data transmission.
Performance
(Somewhat important)
The page response time is excellent with 0.12 seconds.
The file size of the HTML document is fine (26 kB).

HTTP Response Header

NameValue
servernginx/1.18.0
dateThu, 18 Jul 2024 08:21:50 GMT
content-typetext/html; charset=utf-8
set-cookie61 Characters
x-xss-protection1; mode=block
x-frame-optionsSAMEORIGIN
x-content-type-optionsnosniff
content-security-policyscript-src 'self' 'unsafe-inline' 'unsafe-eval' https://*.arb-silva.de https://arb-silva.de https://matomo.dsmz.de; img-src * 'self' data:; font-src * data:; media-src *; object-src 'self'; frame-src 'self'; child-src 'self'
referrer-policyorigin-when-cross-origin, strict-origin-when-cross-origin
x-silvamain
content-encodinggzip
statuscode200
http_versionHTTP/2

External factors

Blacklists
(Nice to have)
This website is not classified "for adult only".
This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 634 referring domains.
This page has 75,012 backlinks.
This page has backlinks from 379 different ip addresses.
Facebook popularity
(Somewhat important)
The page has 0 shares and comments on Facebook.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

User-agent: Googlebot
Disallow: /.external/
User-agent: *
Disallow: /.external/
Disallow: /fileadmin/arb_web_db/
Disallow: /fileadmin/silva_databases/
Disallow: /f/arb_web_db/
Disallow: /f/silva_databases/
user-agent: AhrefsBot
Disallow: /.external/
Disallow: /fileadmin/arb_web_db/
Disallow: /fileadmin/silva_databases/
Disallow: /f/arb_web_db/
Disallow: /f/silva_databases/

Similar sites

Search preview

www.arb-silva.de
Silva
The SILVA database project provides comprehensive, quality checked and regularly updated databases of aligned small (16S / 18S, SSU) and large subunit (23S / 28S, LSU) ribosomal RNA (rRNA) sequences for all three domains of life (Bacteria, Archaea and Eukarya).

Most important keywords

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

KeywordResultRecheck
SILVA92%Check
SILVA ACT74%Check
data63%Check
SILVA taxonomy62%Check
SILVA Tree Viewer61%Check
ACT59%Check
RNA58%Check
ARB56%Check
project55%Check
rRNA55%Check
Show more keywords and terms

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