Goldbook.iupac.org - SEO Checker

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Overview of the SEO Check
Meta information
98% 
Page quality
63% 
Page structure
79% 
Link structure
100% 
Server
81% 
External factors
100% 
SEO Score
Response time
0.80 s
File size
15.60 kB
Words
301
Media files
2
Number of links
21 internal / 3 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
The IUPAC Compendium of Chemical Terminology
The length of the page title is perfect. (450 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
The IUPAC Compendium of Chemical Terminology
The length of the meta description is perfect. (450 pixels out of 1000 max pixel length)
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: Canada
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)
This page is hosted on a subdomain. Use a top level domain for better SEO results.
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
descriptionThe IUPAC Compendium of Chemical Terminology
authorThe International Union of Pure and Applied Chemistry (IUPAC)
keywordschemistry, nomenclature, terminology, vocabulary, definitions
viewportwidth=device-width, initial-scale=1
langen
charsetUTF-8

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Page quality

Content
(Critically important)
There are only 301 words on this page. Good pages should have about 800 words of useful content.
31.9% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
Words from the H1 heading are used in the page content.
The page contains a listing, which indicates a good text layout.
3 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 21.63 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 "width=device-width, initial-scale=1" is provided.
Bold and strong tags
(Somewhat important)
Empty bold or strong tags were found on this page.
Image SEO
(Somewhat important)
1 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
https://goldbook.iupac.org/img/iupac.jpgNo alt attribute provided
https://goldbook.iupac.org/img/gb-cover.jpgIUPAC Compendium of Chemical Terminology

Page structure

H1 heading
(Critically important)
Compendium of Chemical Terminology
The H1 heading is perfect.
Headings
(Important)
The structure of headings is missing one or more levels. Do not skip heading levels.

Heading structure

Heading levelContent
H1 Compendium of Chemical Terminology
H2 Alphabetical Index
H3 Additional Indexes
H3 Expanded Search!
H3 New Download Formats!
H3 Usage License
H5 Version 5.0.0 (12379 Terms)
The number of internal links is ok.
Every linktext is unique.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are 3 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://goldbook.iupac.org/Subdomain No Text
/pages/aboutAbout
/pages/historyHistory
/pages/faqFAQ
/pages/apiGold Book API
/pages/softwareSoftware
/indexes/constantsPhysical Constants
/indexes/unitsUnits of Measure
/indexes/quantitiesPhysical Quantities
/indexes/prefixesSI Prefixes
/indexes/ringsRing Index
/indexes/generalGeneral Formulae
/indexes/exactExact Formulae
/sources/indexSource Documents
/terms/bydivisionTerms by IUPAC Division
/terms/byorgTerms by Organization
/cdn-cgi/l/email-protectionJan Kaiser - Content Editor
/cdn-cgi/l/email-protectionStuart J. Chalk - Technical Editor
https://iupac.org/body/039/External Joint Subcommittee on the IUPAC Gold Book
/pages/aboutabout page
/cdn-cgi/l/email-protection[email protected]
https://creativecommons.org/li...External Creative Commons Attribution-ShareAlike CC BY-SA (CC BY-SA) 4.0 International
/cdn-cgi/l/email-protectionIUPAC Secretariat
https://iupac.org/New window External International Union of Pure and Applied Chemistry

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://goldbook.iupac.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 0.80 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 (16 kB).

HTTP Response Header

NameValue
dateSun, 27 Jul 2025 18:12:02 GMT
content-typetext/html; charset=UTF-8
report-to{"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=ks0fcbLF0SNJHblAWV4Db5WNpNhf6HHp%2B9Ty1%2B07Je%2FKyHWmyc7qDuPRNGjTlQFWdlSTZMJY1w9b%2BqS%2BbYVtkUq6OZ%2FkF7uOzZ8YJiGH%2FK5UoQ%3D%3D"}]}
varyAccept-Encoding,User-Agent
servercloudflare
content-security-policyupgrade-insecure-requests
alt-svch3=":443"; ma=86400
x-turbo-charged-byLiteSpeed
cf-cache-statusDYNAMIC
nel{"report_to":"cf-nel","success_fraction":0.0,"max_age":604800}
content-encodingzstd
cf-ray965e1a49e8a414ab-CDG
statuscode200
http_versionHTTP/2

External factors

This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 2,822 referring domains.
This page has 5,456 backlinks.
This page has backlinks from 285 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

# for more info about robots.txt see http://www.robotstxt.org/
User-agent: *
Disallow: /files
Disallow: /extras

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goldbook.iupac.org
The IUPAC Compendium of Chemical Terminology
The IUPAC Compendium of Chemical Terminology

Most important keywords

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

KeywordResultRecheck
Compendium75%Check
Chemical75%Check
Chemical Terminology75%Check
Terminology74%Check
IUPAC Compendium74%Check
IUPAC73%Check
IUPAC Gold59%Check
IUPAC Gold Book55%Check
Gold46%Check
Book46%Check
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