Bluemarlin-koeln.de - SEO Checker

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Overview of the SEO Check
Meta information
61% 
Page quality
69% 
Page structure
37% 
Link structure
43% 
Server
100% 
External factors
63% 
SEO Score
Response time
0.15 s
File size
196.00 kB
Words
751
Media files
21
Number of links
95 internal / 8 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Tauchsport BlueMarlin GmbH & Co. KG | Tauchschule & Shop - 2 x in Köln
The page title should be shorter than 580 pixels. It is 666 pixels long. Optimize title
There are no duplicate words in the title
Meta description
(Critically important)
Wir bieten dir alles rund ums Tauchen in Köln! In unserem Tauchshop in der Kölner City findest du deine passende Tauchausrüstung, in unserer Tauchschule bieten wir Tauchkurse vom Schnuppertauchen bis zur Tauchlehrerausbildung und in unserer Tauchbasis am Fühlinger See erwarten dich zahlreiche Fun Dives & Aktivitäten!
The meta description is too long: 2027 pixels from max. 1000 pixels. Optimize description
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
https://www.bluemarlin-koeln.de/
There is a valid canonical link specified.
Language
(Somewhat important)
Language detected in text: de
Language defined in HTML: de
Server location: United States of America
The following language is defined by HTML: de
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
d-service-workerregister
viewportinitial-scale=1, minimum-scale=1, maximum-scale=5, viewport-fit=cover
dm:lcp-preloaddm:lcp-frozen
apple-mobile-web-app-capableyes
descriptionWir bieten dir alles rund ums Tauchen in Köln! In unserem Tauchshop in der Kölner City findest du deine passende Tauchausrüstung, in unserer Tauchschule bieten wir Tauchkurse vom Schnuppertauchen bis zur Tauchlehrerausbildung und in unserer Tauchbasis am Fühlinger See erwarten dich zahlreiche Fun Dives & Aktivitäten!
keywordsTauchen, Köln, Tauchschule, Tauchkurse, BlueMarlin, Tauchshop, Tauchausrüstung, Kaufen, Geschäft, Tauchgeschäft, Shop, Aqua Lung, Suunto, Polaris, Atemregler, Tauchschule, Tauchkurse, Open Water Diver, Advanced Open Water Diver, Schnuppertauchen, Fuehlinger See, Fühlinger See, CMAS, PADI, IAC, Indoor, Tauchen, Köln, Globetrotter, Köln, Kurse, Verkauf, Tauchequipment
langde
twitter:cardsummary
twitter:titleTauchsport BlueMarlin GmbH & Co. KG | Tauchschule & Shop - 2 x in Köln
twitter:descriptionWir bieten dir alles rund ums Tauchen in Köln! In unserem Tauchshop in der Kölner City findest du deine passende Tauchausrüstung, in unserer Tauchschule bieten wir Tauchkurse vom Schnuppertauchen bis zur Tauchlehrerausbildung und in unserer Tauchbasis am Fühlinger See erwarten dich zahlreiche Fun Dives & Aktivitäten!
twitter:imagehttps://le-cdn.website-editor.net/s/4d990c3c5489448cb979d1e62cb2443d/dms3rep/multi/opt/BlueMarlin-Logo-1920w.jpg?Expires=1794219247&Signature=D~fShc6JX4z0DQDNu0-mWhn~xae5ins3dTv1RsvqDpHXwdgcyHH1AAWNN3O~Z0VfcKf31VSqkuSZSL-5wnE2csMUVblJFjV0Nwnx7OFVa5LhRaE6tHw~UJehcX-2dxl8wUQHgp8I8C3GpYoH4EK6BKH8Q5mICGsPACaNBcZySSpyLE6~0FJkqG6j2-qKqEpq-3YTO7ZdDVyLtP6l9MgM-aCWhybonK8jygplF~Cxc49VN7oucEOI35oQZF62sc-7t2IT6X7~pJvuwx33oy-xHbWTTToHoqZLd3OJwaxMua338daxpTquJpYGnVPnqiUTXNu3Irxic~WmRwbM358phw__&Key-Pair-Id=K2NXBXLF010TJW
og:typewebsite
og:urlhttps://www.bluemarlin-koeln.de/
og:descriptionWir bieten dir alles rund ums Tauchen in Köln! In unserem Tauchshop in der Kölner City findest du deine passende Tauchausrüstung, in unserer Tauchschule bieten wir Tauchkurse vom Schnuppertauchen bis zur Tauchlehrerausbildung und in unserer Tauchbasis am Fühlinger See erwarten dich zahlreiche Fun Dives & Aktivitäten!
og:titleTauchsport BlueMarlin GmbH & Co. KG | Tauchschule & Shop - 2 x in Köln
og:imagehttps://le-cdn.website-editor.net/s/4d990c3c5489448cb979d1e62cb2443d/dms3rep/multi/opt/BlueMarlin-Logo-1920w.jpg?Expires=1794219247&Signature=D~fShc6JX4z0DQDNu0-mWhn~xae5ins3dTv1RsvqDpHXwdgcyHH1AAWNN3O~Z0VfcKf31VSqkuSZSL-5wnE2csMUVblJFjV0Nwnx7OFVa5LhRaE6tHw~UJehcX-2dxl8wUQHgp8I8C3GpYoH4EK6BKH8Q5mICGsPACaNBcZySSpyLE6~0FJkqG6j2-qKqEpq-3YTO7ZdDVyLtP6l9MgM-aCWhybonK8jygplF~Cxc49VN7oucEOI35oQZF62sc-7t2IT6X7~pJvuwx33oy-xHbWTTToHoqZLd3OJwaxMua338daxpTquJpYGnVPnqiUTXNu3Irxic~WmRwbM358phw__&Key-Pair-Id=K2NXBXLF010TJW
charsetutf-8

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Page quality

Content
(Critically important)
Words from the H1 heading are not used in the page content.
This page contains 751 words. That's ok.
30.4% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
The page contains a listing, which indicates a good text layout.
6 paragraphs were found on this page.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 11.57 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
A viewport "initial-scale=1, minimum-scale=1, maximum-scale=5, viewport-fit=cover" is provided.
Bold and strong tags
(Somewhat important)
The amount of tags is very high (18). We recommend using a maximum of 15 tags for this page.
Some tags are too long. With 82 characters this one is longer than 70 characters:
"hier findest du unsere aktuellen tauchtermine, tauchkurse und events im überblick:"
The following tag is repeated too often: bluemarlin
Image SEO
(Somewhat important)
13 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.

Media list

URLAlt attributeTitle
...VWPihb~RN4Q__&Key-Pair-Id=K2NXBXLF010TJWNo alt attribute provided
...FFrMmoA8Wtw__&Key-Pair-Id=K2NXBXLF010TJWBlueMarlin STORE (City / Südstadt)BlueMarlin STORE (City / Südstadt)
...9RmLUiU2wlA__&Key-Pair-Id=K2NXBXLF010TJWBlueMarlin TauchbasisBlueMarlin Tauchbasis
...dj8y3um7jeg__&Key-Pair-Id=K2NXBXLF010TJWNo alt attribute provided
...6rc9jGRb1ig__&Key-Pair-Id=K2NXBXLF010TJWNo alt attribute provided
...6GpvYkY2~xQ__&Key-Pair-Id=K2NXBXLF010TJWNo alt attribute provided
...8OUw6BBMzvg__&Key-Pair-Id=K2NXBXLF010TJWNo alt attribute provided
...CjTaNYxiK5w__&Key-Pair-Id=K2NXBXLF010TJWNo alt attribute provided
...HDqFcSUh7zA__&Key-Pair-Id=K2NXBXLF010TJWNo alt attribute provided
...and1/dms3rep/multi/opt/117622-1920w.jpegNo alt attribute provided
...KpvqlmxJokQ__&Key-Pair-Id=K2NXBXLF010TJWNo alt attribute provided
...BE393ArL6nQ__&Key-Pair-Id=K2NXBXLF010TJWNo alt attribute provided
...VwOA8i6ww4Q__&Key-Pair-Id=K2NXBXLF010TJWNo alt attribute provided
...7N-YyOuWD8Q__&Key-Pair-Id=K2NXBXLF010TJWNo alt attribute provided
...ruF8olNEI4w__&Key-Pair-Id=K2NXBXLF010TJWNo alt attribute provided

Page structure

H1 heading
(Critically important)
# Tauchshop # Onlineshop # Tauchschule # Tauchbasis # Fun Dives # Tauchreisen # 2 Standorte in Köln
Too many H1 headings
Headings
(Important)
The structure of headings is missing one or more levels. Do not skip heading levels.
There are 31 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 # Tauchshop # Onlineshop # Tauchschule # Tauchbasis # Fun Dives # Tauchreisen # 2 Standorte in Köln
H1 Aktuelle Tauchtermine
H1 BlueMarlin. Unter Wasser zu Hause.
H2 Alles rund ums Tauchen in Köln
H2 Unsere Zentrale - BlueMarlin STORE
H2 TAUCHKURSE
H3 Freitag, 09.10.2026
H3 Samstag, 10.10.2026
H3 Sonntag, 11.10.2026
H3 Freitag, 16.10.2026
H3 Samstag, 17.10.2026
H3 SCUBA DIVER KURS, 499 Euro
H3 WATERPROOF TESTWOCHEN
H3 BlueMarlin GESCHENK GUTSCHEINE
H3 TROCKI FINANZIERUNG - AB SOFORT MÖGLICH!
H3 Die neuen Dive Guide-Termine für 2027 sind da!
H3 Waterproof Testwochen vom 14.11. - 11.12.2026
H3 Venture Heat zum Angebotspreis
H3 WINTERPROGRAMM 2026/2027
H3 Stress and Rescue Kurs am 29./30.08. & 06.09. - Plätze frei!
H3 Plätze frei - Tauchsafari vom 17.-24.09.2026
H3 Tauchkurse
H3 Tauchbasis
H3 Tauchreisen
H3 Sporttauchen/Tauchkurse
H3 BlueMarlin STORE (City/Südstadt)
H3 BlueMarlin Fühlinger See
H5 Wenn ich den See seh', brauch ich kein Meer mehr!
H5 Erfahrung seit über 20 Jahren | Optimale Infrastruktur mit 2 Standorten in Köln
H5 In unserem Hauptsitz am Bonner Wall findest du neben einem riesigen Tauch- & Schnorchelsortiment, Werkstatt, Füllstation alles zum Thema Tauchschule, Tauchbasis am Fühlinger See und unseren Tauchre...
H5 Wir bieten dir eine optimale Infrastruktur für deine professionelle Tauchausbildung in Köln. Unsere Tauchkurse finden nach den international anerkannten Standards der Verbände i.a.c., SSI und CMAS ...
Some anchor texts are used more than once.
19 links don't have an 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 8 external links on this page.

Found links on this page

LinkAttributesAnchor text
/tauchshopBlueMarlin Store Köln City
/tauchbasis-fuehlinger-seeFiliale FühSe
/kontaktÖffnungszeiten
/blogNews
https://www.bluemarlin-koeln.de/No Text
/tauchshopBlueMarlin Store
/tauchshopText duplicate BlueMarlin Store
/werkstattWerkstatt
https://www.bluemarlin-onlines...New window External Subdomain Onlineshop
/gutscheineGutscheine
/tauchkurseKurse
/tauchkurseTauchkurse
/tauchkurseSpezialkurse
/tauchkurseDive Pro-Ausbildung
/technisches-tauchenTechnisches Tauchen
/tauchkurseFreediving
/gutscheineText duplicate Gutscheine
/tauchbasis-fuehlinger-seeTauchbasis
/tauchbasis-fuehlinger-seeText duplicate Tauchbasis
/webcheckinPreise & Buchung
/taucheninkoelnFun Dives & Events
/dein-tauchclub-in-koelnTauchclub
/sichtweiten-fuehlinger-seeSichtweiten
/tauchreisenTouren
/kontaktKontakt
/kontaktText duplicate Kontakt
/blogNews & Aktuelles
/das-bluemarlin-teamDas BlueMarlin-Team
/flaschenpostFlaschenpost
/tauchshopIMG-ALT BlueMarlin STORE (City / Südstadt)
/tauchbasis-fuehlinger-seeIMG-ALT BlueMarlin Tauchbasis
/tauchshopTauchshop
https://bluemarlin-onlineshop.de/New window External # Onlineshop
/tauchkurseTauchschule
/tauchbasis-fuehlinger-see# Tauchbasis
/taucheninkoeln# Fun Dives
/tauchreisenTauchreisen
/kontakt2 Standorte in Köln
/blogText duplicate News & Aktuelles
/refresher-auffrischungs-tauch...> mehr Infos
/sk-tieftauchen-deep-divingText duplicate > mehr Infos
/taucheninkoelnText duplicate > mehr Infos
/refresher-auffrischungs-tauch...Text duplicate > mehr Infos
/nachttauchen-nightdivingText duplicate > mehr Infos
/open-water-diver---einsteiger...Text duplicate > mehr Infos
/stress-and-rescue-diver-kursText duplicate > mehr Infos
/taucheninkoelnText duplicate > mehr Infos
/tauchkurseTauchkurs-Seite
https://bluemarlin-onlineshop.de/New window External Text duplicate Onlineshop
/scuba-diverKURSE BUCHEN
/waterproof-testwochenMEHR INFOS
/gutscheineJETZT BESTELLEN
/trockentauchenText duplicate MEHR INFOS
/letzte-freie-platze-in-unsere...No Text
/letzte-freie-platze-in-unsere...Die neuen Dive Guide-Termine für 2027 sind da!
/letzte-freie-platze-in-unsere...No Text
/waterproof-testwochenNo Text
/waterproof-testwochenWaterproof Testwochen vom 14.11. - 11.12.2026
/waterproof-testwochenNo Text
/venture-heat-nie-wieder-frierenNo Text
/venture-heat-nie-wieder-frierenVenture Heat zum Angebotspreis
/venture-heat-nie-wieder-frierenNo Text
/winterprogramm-2026-2027No Text
/winterprogramm-2026-2027WINTERPROGRAMM 2026/2027
/winterprogramm-2026-2027No Text
/stress-and-rescue-kurs-am-29-...No Text
/stress-and-rescue-kurs-am-29-...Stress and Rescue Kurs am 29./30.08. & 06.09. - Plätze frei!
/stress-and-rescue-kurs-am-29-...No Text
/platze-frei-tauchsafari-vom-1...No Text
/platze-frei-tauchsafari-vom-1...Plätze frei - Tauchsafari vom 17.-24.09.2026
/platze-frei-tauchsafari-vom-1...No Text
/tauchkurseNo Text
/tauchkurseText duplicate Tauchkurse
/tauchkurseMehr erfahren
/tauchbasis-fuehlinger-seeNo Text
/tauchbasis-fuehlinger-seeText duplicate Tauchbasis
/tauchbasis-fuehlinger-seeText duplicate Mehr erfahren
/tauchreisenNo Text
/tauchreisenText duplicate Tauchreisen
/tauchreisenText duplicate Mehr erfahren
/tauchkurseNo Text
/tauchkurseTAUCHKURSE
/tauchkurseNo Text
/tauchkurseTAUCHLEHRER KURSE
/tauchkurseNo Text
/tauchkurseTECHNISCHES TAUCHEN
/tauchkurseNo Text
/tauchkurseFREEDIVING KURSE
/kontaktKontakt/Öffnungszeiten
/das-bluemarlin-teamDas BlueMarlin Team
/taucheninkoelnNew window Die nächsten Tauchgänge
https://www.bluemarlin-onlines...New window External Subdomain BlueMarlin Onlineshop
/flaschenpostFlaschenpost Newsletter
/tauchtauglichkeitNew window Gesundheitsinfo Tauchen
http://www.bluemarlin-onlinesh...New window External Subdomain www.bluemarlin-onlineshop.de
/kontaktKontakt & Öffnungszeiten
/impressumImpressum & Datenschutz
/jobsAktuelle Stellenangebote bei BlueMarlin
/tauchshopBlueMarlin STORE (City/Südstadt)
/tauchbasis-fuehlinger-seeBlueMarlin Fühlinger See
https://www.instagram.com/blue...New window External Subdomain No Text
https://de-de.facebook.com/Tau...New window External Subdomain No Text
https://www.youtube.com/user/B...New window External Subdomain No Text

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://www.bluemarlin-koeln.de/"
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 is excellent with 0.15 seconds.
The file size of the HTML document is fine (196 kB).

HTTP Response Header

NameValue
content-typetext/html;charset=utf-8
x-ws-originavailable
x-ws-ratelimit-limit1000
x-ws-ratelimit-remaining998
dateSat, 10 Oct 2026 19:20:24 GMT
servernginx
cache-controlno-cache, must-revalidate
expiresThu, 01 Jan 1970 00:00:00 GMT
x-content-type-optionsnosniff
strict-transport-securitymax-age=15768000; preload
content-security-policyframe-ancestors https://*.ionos.com https://*.ionos.at https://*.ionos.co.uk https://*.ionos.de https://*.ionos.es https://*.ionos.fr https://*.ionos.it https://*.ionos.ca https://*.ionos.mx https://*.ionos.us https://*.website-editor.net https://*.mywebsite-editor.com www.bluemarlin-koeln.de
varyuser-agent,accept-encoding
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speculation-rules"https://static-cdn.website-editor.net/speculations/rules/prerender-1.0.3.json"
content-encodinggzip
d-geoEU
statuscode200
http_versionHTTP/2

External factors

This page has only a few links from other websites.
This page only has backlinks from 21 referring domains.
This page only has 49 backlinks.
This page only has few backlinks from 21 different ip addresses.

Links from Wikipedia

No links from Wikipedia were found.

Robots.txt

# Sitemap is also available on /sitemap.xml
Sitemap: https://www.bluemarlin-koeln.de/sitemap.xml
User-agent: *
Content-Signal: search=yes, ai-input=yes, ai-train=yes

Similar sites

Search preview

www.bluemarlin-koeln.de
Tauchsport BlueMarlin GmbH & Co. KG | Tauchschule & Shop - ...
Wir bieten dir alles rund ums Tauchen in Köln! In unserem Tauchshop in der Kölner City findest du deine passende Tauchausrüstung, in unserer Tauchschule bieten wir Tauchkurse vom Schnuppertauchen bis zur Tauchlehrerausbildung und in unserer Tauchbasis am Fühlinger See erwarten dich zahlreiche Fun Dives & Aktivitäten!

Most important keywords

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

KeywordResultRecheck
Köln94%Check
BlueMarlin76%Check
Tauchschule76%Check
Tauchschule BlueMarlin75%Check
Tauchen Köln74%Check
BlueMarlin Store Köln73%Check
Tauchbasis72%Check
Tauchschule Shop71%Check
Tauchschule Tauchkurse67%Check
BlueMarlin Onlineshop67%Check
Show more keywords and terms

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