Clinicaltrials.gov - SEO Checker

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Overview of the SEO Check
Meta information
69% 
Page quality
52% 
Page structure
79% 
Link structure
0% 
Server
100% 
External factors
100% 
SEO Score
Response time
0.14 s
File size
84.60 kB
Words
21
Media files
0
Number of links
1 internal / 0 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
ClinicalTrials.gov
The page title is too short. (152 pixels of 580 max pixel length) Optimize title
The domain is used in the page's title.
There are no duplicate words in the title
Meta description
(Critically important)
The meta description is empty.
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is specified.
Language
(Somewhat important)
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 character encoding is not specified in the HTTP header.
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
HandheldFriendlyTrue
MobileOptimized320
viewportwidth=device-width, initial-scale=1.0, minimum-scale=1
descriptionEmpty
robotsindex, follow
ncbi_appctgov2
ncbi_dbEmpty
ncbi_pinger_track_statfalse
ncbi_pinger_ga_tracktrue
ncbi_pinger_ga_tracking_idUA-68648221-4
ncbi_pinger_url_query_striplat,lng,locStr
ncbi_pinger_click_use_capturetrue
ncbi_pinger_gtm_tracktrue
ncbi_app_versionEmpty
langen
twitter:titleEmpty
twitter:descriptionEmpty
twitter:cardsummary
og:titleEmpty
og:descriptionEmpty
X-UA-CompatibleIE=edge
charsetUTF-8

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Page quality

Content
(Critically important)
There are only 21 words on this page. Use at least 250 words to provide useful information.
Only 1 paragraph/s was/were found on this page.
14.3% of the text are stop words.
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 15 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
A viewport "width=device-width, initial-scale=1.0, minimum-scale=1" is provided.
At least one 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

No media files were found.

Page structure

H1 heading
(Critically important)
There is no H1 heading specified.
Headings
(Important)
The structure of headings is missing one or more levels. Do not skip heading levels.

Heading structure

Heading levelContent
H4 Glossary
Baselink: /
This page seems to be an entry page, because only very few links were found.
Every linktext is unique.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are no external links on this page.

Found links on this page

LinkAttributesAnchor text
https://clinicaltrials.gov/policyData Element Definitions

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://clinicaltrials.gov/"
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 0.14 seconds.
The file size of the HTML document is fine (85 kB).

HTTP Response Header

NameValue
dateSat, 21 Jun 2025 12:10:28 GMT
serveristio-envoy
strict-transport-securitymax-age=31536000; includeSubDomains; preload
x-frame-optionsSAMEORIGIN
content-typetext/html
last-modifiedTue, 17 Jun 2025 17:42:27 GMT
etag"6851a903-15265-gzip"
expiresThu, 01 Jan 1970 00:00:01 GMT
cache-controlno-cache,no-store, max-age=0, must-revalidate
pragmano-cache
accept-rangesbytes
x-envoy-upstream-service-time0
varyAccept-Encoding
content-encodinggzip
x-ua-compatibleIE=Edge
x-xss-protection1; mode=block
content-length14316
via1.1 google
alt-svcclear
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 11,244 referring domains.
This page has 508,780 backlinks.
This page has backlinks from 6,961 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

User-agent: *

Disallow: /api/

# Allow access to the internal API to let SPA function properly
Allow: /api/int/

Disallow: /search?
Disallow: /expert-search?

# this is ported from 'classic' site
# Some docs say must be a whole number of seconds.
# Crawlers differ whether this means delay-between-calls or whether it is max-requests-in-window.
# Google ignore this value, but supposedly honored by yandex and bing.
Crawl-delay: 1

Similar sites

Search preview

clinicaltrials.gov
ClinicalTrials.gov

Most important keywords

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

KeywordResultRecheck
glossary38%Check
Hide34%Check
Study34%Check
record34%Check
managers34%Check
refer34%Check
Data34%Check
Element34%Check
Definitions34%Check
submitting34%Check
Show more keywords and terms

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