Validator.w3.org - SEO Checker

Overview of the SEO Check
Meta information
100% 
Page quality
47% 
Page structure
100% 
Link structure
97% 
Server
100% 
External factors
100% 
SEO Score
Response time
0.15 s
File size
25.70 kB
Words
260
Media files
4
Number of links
19 internal / 10 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
The W3C Markup Validation Service
The length of the page title is perfect. (324 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
W3C's easy-to-use markup validation service, based on SGML and XML parsers.
The length of the meta description is perfect. (500 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: 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
keywordsHTML, HyperText Markup Language, Validation, W3C Markup Validation Service
descriptionW3C's easy-to-use markup validation service, based on SGML and XML parsers.
langen
Content-Typetext/html;charset=UTF-8

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Page quality

Content
(Critically important)
Only 2 paragraph/s was/were found on this page.
There are only 260 words on this page. Good pages should have about 800 words of useful content.
23.1% 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.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 20.25 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No viewpoint tag is provided.
No Apple touch icon is specified.
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)
Alt text (alternative text) is correctly used on all found images.
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://validator.w3.org/images/w3c.pngW3C Logo
...w3.org/assets/logos/w3c/w3c-no-bars.svgW3C
/images/opensource-55x48.pngOpen-SourceWe are building certified Open Source/Free Software. - see www.opensource.org
...w3.org/QA/Tools/I_heart_validatorI heart Validator logoDonate to W3C

Page structure

H1 heading
(Critically important)
Markup Validation Service W3C Logo
The H1 heading is perfect.
Headings
(Important)
The heading structure is perfect.

Heading structure

Heading levelContent
H1 Markup Validation Service W3C Logo
Some anchor texts are used more than once.
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 10 external links on this page.
LinkAttributesAnchor text
https://www.w3.org/External Subdomain IMG-ALT W3C Logo
https://validator.w3.org/Markup Validation Service
https://validator.w3.org/Anchor Validate by URI
https://validator.w3.org/Anchor Validate by File Upload
https://validator.w3.org/Anchor Validate by Direct Input
https://validator.w3.org/Anchor More Options
https://validator.w3.org/Anchor Text duplicate More Options
http://www.w3.org/QA/2005/01/V...External Subdomain information page
https://validator.w3.org/Anchor Text duplicate More Options
/docs/help.htmlmarkup validity
A-TITLE What is markup validation?
https://validator.w3.org/feed/Subdomain RSS/Atom feeds
A-TITLE Feed validator, hosted at W3C
http://jigsaw.w3.org/css-valid...External Subdomain CSS stylesheets
A-TITLE W3C CSS Validation Service
https://validator.w3.org/mobile/Subdomain MobileOK content
A-TITLE MobileOK Checker
/checklinkSubdomain find broken links
A-TITLE W3C Link Checker
http://www.w3.org/QA/Tools/External Subdomain other validators and tools
https://validator.w3.org/nuSubdomain non-DTD-based validator
https://validator.w3.org/Home
A-TITLE Go to the Home Page for The W3C Markup Validation Service
/about.htmlAbout...
A-TITLE Information About this Service
/whatsnew.htmlNews
A-TITLE The changes made to this service recently
https://validator.w3.org/docs/Docs
A-TITLE Documentation for this Service
/docs/help.htmlHelp & FAQ
A-TITLE Help and answers to frequently asked questions
/feedback.htmlFeedback
A-TITLE How to provide feedback on this service
/contribute.htmlContribute
A-TITLE How to contribute to the validator project
https://www.w3.org/StatusExternal Subdomain IMG-ALT W3C
A-TITLE W3C's Open Source, bringing you free Web quality tools and more
https://www.w3.org/donate/External Subdomain IMG-ALT I heart Validator logo
https://www.w3.org/External Subdomain World Wide Web Consortium
https://www.w3.org/policies/External Subdomain Anchor liability
https://www.w3.org/policies/External Subdomain Anchor trademark
https://www.w3.org/copyright/d...External Subdomain permissive license
A-TITLE W3C Document License

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://validator.w3.org/"
HTTP header
(Important)
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 0.15 seconds.
The file size of the HTML document is fine (26 kB).

HTTP Response Header

NameValue
dateSun, 15 Sep 2024 01:19:08 GMT
content-typetext/html; charset=utf-8
varyAccept-Encoding
strict-transport-securitymax-age=15552015; preload
public-key-pinspin-sha256="cN0QSpPIkuwpT6iP2YjEo1bEwGpH/yiUn6yhdy+HNto="; pin-sha256="WGJkyYjx1QMdMe0UqlyOKXtydPDVrk7sl2fV+nNm1r4="; pin-sha256="LrKdTxZLRTvyHM4/atX2nquX9BeHRZMCxg3cf4rhc2I="; max-age=864000
x-frame-optionsdeny
x-xss-protection1; mode=block
x-request-id8c34c96ced15972a
cf-cache-statusBYPASS
set-cookie251 Characters
servercloudflare
cf-ray8c34c96ced15972a-FRA
content-encodinggzip
alt-svch3=":443"; ma=86400
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 182,172 referring domains.
This page has 1,191,791,988 backlinks.
This page has backlinks from 88,944 different ip addresses.

Robots.txt

#
# robots.txt for validator.w3.org
#

User-agent: *
Disallow: /check
Disallow: /feed/check
Disallow: /checklink
Disallow: /mobile/check
Disallow: /mobile/alpha
Disallow: /css-validator
Disallow: /unicorn/check
Disallow: /http-checker
Disallow: /i18n-checker/check
Disallow: /nu

Search preview

validator.w3.org
The W3C Markup Validation Service
W3C's easy-to-use markup validation service, based on SGML and XML parsers.

Most important keywords

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

KeywordResultRecheck
W3C79%Check
W3C Markup Validation75%Check
W3C Markup Validation Service74%Check
Markup73%Check
Validation73%Check
Service73%Check
Validation Service73%Check
Markup Validation Service73%Check
Clean up Markup60%Check
Source Clean up Markup55%Check

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