Captcha.net - SEO Checker

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Overview of the SEO Check
Meta information
66% 
Page quality
76% 
Page structure
70% 
Link structure
88% 
Server
78% 
External factors
100% 
SEO Score
Response time
1.06 s
File size
13.10 kB
Words
1557
Media files
2
Number of links
3 internal / 22 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
The Official CAPTCHA Site
The length of the page title is perfect. (246 pixels out of 580 max pixel length)
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
Server location: United States of America
The language is not specified in the HTML markup.
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 character encoding is not specified.
The character encoding is not specified in the HTTP header.
Doctype
(Nice to have)
No doctype markup was found.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

No meta tags were found.

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Page quality

Content
(Critically important)
This page contains 1557 words. That's ok.
39.6% 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.
27 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 13.9 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.
This page only loads 1 JavaScript files. That's good!
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 31 tags for 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)
The HTTPS protocol for secure data transmission is not used.

Media list

URLAlt attributeTitle
/images/recaptcha-example.gifCAPTCHA examplesee a live demo of a CAPTCHA
http://captcha.net/duo_logo.pngNo alt attribute provided

Page structure

H1 heading
(Critically important)
CAPTCHA: Telling Humans and Computers Apart Automatically
Too many H1 headings
Headings
(Important)
The heading structure is perfect.

Heading structure

Heading levelContent
H1 CAPTCHA: Telling Humans and Computers Apart Automatically
H1 Get a Free CAPTCHA For Your Site
H1 Test Drive a CAPTCHA
H1 New: Learn Spanish, German or French for free while translating the Web!
H1 Applications of CAPTCHAs
H1 Guidelines
H1 The "Pornography Attack" is Not a Concern
H1 Advancing Artificial Intelligence
H1 Academic Publications and Presentations
H1 Selected Popular Press Pieces
There are too few (3) internal links on this page.
Every linktext is unique.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are 22 external links on this page.

Found links on this page

LinkAttributesAnchor text
http://recaptcha.net/learnmore...External IMG-ALT CAPTCHA example
http://recaptcha.net/whyrecapt...External Get a Free CAPTCHA For Your Site
http://recaptcha.net/whyrecapt...External reCAPTCHA project
http://recaptcha.net/plugins/w...External WordPress
A-TITLE WordPress CAPTCHA
http://recaptcha.net/plugins/m...External MediaWiki
A-TITLE MediaWiki CAPTCHA
http://recaptcha.net/plugins/php/External PHP
A-TITLE PHP CAPTCHA
http://recaptcha.net/plugins/a...External ASP.NET
A-TITLE ASP CAPTCHA
http://recaptcha.net/learnmore...External reCAPTCHA
http://server251.theory.cs.cmu...External Subdomain SQUIGL-PIX
http://server251.theory.cs.cmu...External Subdomain ESP-PIX
http://duolingo.com/External New: Learn Spanish, German or French for free while translating the Web!
http://duolingo.com/External No Text
http://duolingo.com/External duolingo.com
http://mailhide.recaptcha.net/External Subdomain reCAPTCHA MailHide
http://recaptcha.net/External Text duplicate reCAPTCHA
http://www.cs.cmu.edu/~biglou/...External Subdomain reCAPTCHA: Human-Based Character Recognition via Web Security Measures.
/Breaking_Audio_CAPTCHAs.pdfBreaking Audio CAPTCHAs
/captcha_cacm.pdfTelling Humans and Computers Apart Automatically
/captcha_crypt.pdfCAPTCHA: Using Hard AI Problems for Security
http://research.microsoft.com/...External Subdomain Using Machine Learning to Break Human Interaction Proofs (HIPs)
http://www.cs.sfu.ca/~mori/res...External Subdomain Recognizing Objects in Adversarial Clutter: Breaking a Visual CAPTCHA.
http://video.google.com/videop...External Subdomain Google Tech Talk about CAPTCHAs and Human Computation
http://query.nytimes.com/gst/f...External Subdomain Human or Computer? Take This Test
http://radar.oreilly.com/archi...External Subdomain reCAPTCHA - Stop Spam, Read Books
http://www.wired.com/techbiz/i...External Subdomain For Certain Tasks, the Cortex Still Beats the CPU

Server configuration

HTTP redirects
(Critically important)
The checked page does not redirect to another URL.
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 slow (1.06 seconds). The response time should be less than 0.4 seconds. Slow websites are bad for search engine bots and also result in bad user experience.
This page only loads 1 CSS files. That's ok.
This page only loads 1 JavaScript files. That's good!
The file size of the HTML document is fine (13 kB).

HTTP Response Header

NameValue
dateSun, 29 Sep 2024 22:41:47 GMT
serverApache/2.4.29 (Ubuntu)
last-modifiedMon, 09 Jul 2012 23:35:49 GMT
etag"348e-4c46e12e09f40-gzip"
accept-rangesbytes
varyAccept-Encoding
content-encodinggzip
content-length5775
content-typetext/html
statuscode200
http_versionHTTP/1.1

External factors

This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 1,730 referring domains.
This page has 69,374 backlinks.
This page has backlinks from 1,390 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

No valid Robots.txt file was found.

Similar sites

Search preview

Most important keywords

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

KeywordResultRecheck
CAPTCHA86%Check
CAPTCHA Site69%Check
CAPTCHA script61%Check
CAPTCHA images60%Check
CAPTCHA implementation59%Check
recommended CAPTCHA59%Check
solve CAPTCHA59%Check
CAPTCHA code59%Check
Official CAPTCHA Site56%Check
Site55%Check
Show more keywords and terms

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