Nibbler SEO audit for www.ncbi.nlm.nih.gov
Summary
Overall8.8
The overall score for this website.
Accessibility9.6
How accessible the website is to mobile and disabled users.
The following tests contribute to this score:
Experience8.8
How satisfying the website is likely to be for users.
The following tests contribute to this score:
Marketing8.9
How well marketed, and popular the website is.
The following tests contribute to this score:
Technology9.0
How well designed and built the website is.
The following tests contribute to this score:
Nibbler tested a sample of 5 pages from this website at 00:45 on 18 Mar 2023 (GMT).
Top priorities for website improvement
- Make sure that all the pages of this website include a meta description. If you don't include one, Google will choose a sample of text from the page to appear in the search engine result. By including a meta description, you can control how your search engine result will appear. (read more)
- Consider updating this website regularly with new content. (read more)
- Consider shortening long anchor text. (read more)
Meta tags2.0
- All pages include at least some metadata, but no pages have a description meta tag. The description meta data is important as it appears on Google's search result pages.
- Make sure that all the pages of this website include a meta description. If you don't include one, Google will choose a sample of text from the page to appear in the search engine result. By including a meta description, you can control how your search engine result will appear.
Pages with no meta description
- Make sure that all the pages of this website include a meta description. If you don't include one, Google will choose a sample of text from the page to appear in the search engine result. By including a meta description, you can control how your search engine result will appear.
Meta Tags (name attribute)
Meta Tags (http-equiv attribute)
| Page URL | Name | Content |
| www.ncbi.nlm.nih.gov/ | Content-Type | text/html; charset=UTF-8 |
| www.ncbi.nlm.nih.gov/account/.../ | Content-Type | text/html; charset=utf-8 |
| www.ncbi.nlm.nih.gov/guide/.../ | Content-Type | text/html; charset=utf-8 |
Freshness4.3
Last updated September 26, 2022
- It looks like this website was last updated on Monday, 26 September 2022. Visitors perceive up-to-date websites as more credible. Websites that are updated regularly are also spidered by search engines more often.
- Consider updating this website regularly with new content.
- To find this information we used the last modified dates reported by this website's server in addition to looking for dates written on each page.
All dates found
Printability6.0
60% of pages are optimised for printing
- 2 pages of this website do not appear to be optimised for printing (using CSS).
- Add printable stylesheets for all pages, wherever possible. In most cases, websites can share printable stylesheets over many or all pages, as with screen-based stylesheets.
Print optimised pages
Page Print www.ncbi.nlm.nih.gov/ Optimised www.ncbi.nlm.nih.gov/account/.../ Optimised www.ncbi.nlm.nih.gov/guide/.../ Optimised www.ncbi.nlm.nih.gov/home/.../ Not detected www.ncbi.nlm.nih.gov/home/.../ Not detected
- Add printable stylesheets for all pages, wherever possible. In most cases, websites can share printable stylesheets over many or all pages, as with screen-based stylesheets.
Media specific CSS detected
Amount of content8.2
Rendering Chart...
- This website has an average of 466 words per page. The amount of content on a website has been shown to correlate with its search engine ranking.
- Consider the amount of text on this website and increase it if appropriate.
Amount of content discovered
| Page | Characters | Words |
| www.ncbi.nlm.nih.gov/ | 2700 | 299 |
| www.ncbi.nlm.nih.gov/account/.../ | 964 | 134 |
| www.ncbi.nlm.nih.gov/guide/.../ | 7097 | 1112 |
| www.ncbi.nlm.nih.gov/home/.../ | 1589 | 204 |
| www.ncbi.nlm.nih.gov/home/.../ | 4265 | 582 |
Internal links8.7
- 14 links use text that is too long. Links should describe what they link to briefly. Linking a long block of text usually indicates an attempt to trick search engines into ranking those keywords highly (a strategy which does not work). Long linked blocks of text are also harder for people to scan.
- Consider shortening long anchor text.
Overly long link text
Link URL Link text Page URL submit.ncbi.nlm.nih.gov/ Submit Deposit data or manuscripts into NCBI databases Submit Icon www.ncbi.nlm.nih.gov/ www.ncbi.nlm.nih.gov/home/learn Learn Find help documents, attend a class or watch a tutorial Books Icon www.ncbi.nlm.nih.gov/ www.ncbi.nlm.nih.gov/home/develop Develop Use NCBI APIs and code libraries to build applications Develop Icon www.ncbi.nlm.nih.gov/ www.ncbi.nlm.nih.gov/home/analyze Analyze Identify an NCBI tool for your data analysis task Graph Icon www.ncbi.nlm.nih.gov/ www.ncbi.nlm.nih.gov/research Research Explore NCBI research and collaborative projects Microscope Icon www.ncbi.nlm.nih.gov/ twitter.com/NLM_NIH .st20 { fill: #FFFFFF; } .st30 { fill: none; stroke: #FFFFFF; stroke-width: 8; stroke-miterlimit: 10; } Twitter www.ncbi.nlm.nih.gov/ www.facebook.com/nationallibraryofmedicine .st10 { fill: #FFFFFF; } .st110 { fill: none; stroke: #FFFFFF; stroke-width: 8; stroke-miterlimit: 10; } Facebook www.ncbi.nlm.nih.gov/ www.youtube.com/user/NLMNIH Youtube .st4 { fill: none; stroke: #FFFFFF; stroke-width: 8; stroke-miterlimit: 10; } .st5 { fill: #FFFFFF; } www.ncbi.nlm.nih.gov/ twitter.com/NLM_NIH .st20 { fill: #FFFFFF; } .st30 { fill: none; stroke: #FFFFFF; stroke-width: 8; stroke-miterlimit: 10; } Twitter www.ncbi.nlm.nih.gov/account/.../ www.facebook.com/nationallibraryofmedicine .st10 { fill: #FFFFFF; } .st110 { fill: none; stroke: #FFFFFF; stroke-width: 8; stroke-miterlimit: 10; } Facebook www.ncbi.nlm.nih.gov/account/.../ www.youtube.com/user/NLMNIH Youtube .st4 { fill: none; stroke: #FFFFFF; stroke-width: 8; stroke-miterlimit: 10; } .st5 { fill: #FFFFFF; } www.ncbi.nlm.nih.gov/account/.../ twitter.com/NLM_NIH .st20 { fill: #FFFFFF; } .st30 { fill: none; stroke: #FFFFFF; stroke-width: 8; stroke-miterlimit: 10; } Twitter www.ncbi.nlm.nih.gov/guide/.../ www.facebook.com/nationallibraryofmedicine .st10 { fill: #FFFFFF; } .st110 { fill: none; stroke: #FFFFFF; stroke-width: 8; stroke-miterlimit: 10; } Facebook www.ncbi.nlm.nih.gov/guide/.../ www.youtube.com/user/NLMNIH Youtube .st4 { fill: none; stroke: #FFFFFF; stroke-width: 8; stroke-miterlimit: 10; } .st5 { fill: #FFFFFF; } www.ncbi.nlm.nih.gov/guide/.../
- Consider shortening long anchor text.
Headings9.0
- All pages were found to use defined headings. This is excellent as it allows visitors and search engines to summarise the content of webpages quickly. Correctly defined headings aid accessibility and are particularly important for search engine optimisation.
- Some pages did not define headings correctly. The H1 tag should be used for the most top-level heading, with H2 being used for sub-headings and H3 for further sub-headings and so-on. Not conforming to this convention may confuse visitors.
- Ensure that headings are defined in a semantically correct way, i.e. always start with a H1 tag. This is used to summarise the page content. Further tags (H2, H3, H4 etc) are meant to summarise and partition sections within the content.
Page headings detail
Server behaviour9.2
404 page
Compression
- This website handles missing pages correctly by sending a 404 HTTP status code.
- This website was served with GZIP encoding. This is very good because it reduces the loading time of a web page.
- 2 of the pages of this website follow the best practice of using a permanent (HTTP 301) redirect between URLs with/without trailing slashes. These pages are ideal.
- 2 of the pages of this website return page content with or without a trailing slash on their URLs. Search engines might see these as separate pages with duplicate content which they could penalise for.
- Use a 301 redirect or a canonical meta tag to force search engines to see the correct version.
Duplicate pages
- Use a 301 redirect or a canonical meta tag to force search engines to see the correct version.
- This website follows the best practice of using a permanent (HTTP 301) redirect from http://ncbi.nlm.nih.gov to http://www.ncbi.nlm.nih.gov. This is ideal.
Images9.9
3% of images have a clearly defined size
2 images are being resized by the browser
- Most images (97.0%) don't have defined sizes using width and height attributes in the HTML. These attributes are optional, but strongly recommended as they help the browser arrange the page more quickly.
- Add width and height attributes to all image tags. The width and height you specify should be the same as the source image. If you want to resize an image in the browser, use CSS.
Non Explicitly Sized Images
- Add width and height attributes to all image tags. The width and height you specify should be the same as the source image. If you want to resize an image in the browser, use CSS.
- 2 images are being stretched in the browser.
- The width and height you specify in an image tag should be the same as the source image. If you want to resize an image in the browser, use the CSS width and height properties.
Stretched Images
- The width and height you specify in an image tag should be the same as the source image. If you want to resize an image in the browser, use the CSS width and height properties.
Twitter10.0
This website is linked with the Twitter account @ncbi
This website's Twitter account has
63,492 followers
- This website was found to link the Twitter account NCBI (@ncbi).
- This website's Twitter account has made 3,787 tweets to 63,492 followers.
Source: Twitter
Mobile10.0
- All of this website appears to be optimised for viewing on a mobile phone or a tablet.
Media specific CSS detected
Analytics10.0
100% of pages use analytics
Multiple Analytics Solutions
- Every page in this website is using some form of analytics software. This is excellent and should allow for a complete analysis of visitor behaviour.
Analytics Software Found
| Software Name |
| Google Analytics |
| Google Tag Manager |
Page titles10.0
100% of pages have defined titles
0% of page titles are weak
- All pages were found to use page titles appropriately. Page titles appear in search results and at the top of the browser's window when visiting the site. Appropriate page titles are particularly important for search engine optimisation.
Page titles
| Page title | Notes |
| No Title | Missing |
| No Title | Missing |
| No Title | Missing |
| About - NCBI | OK |
| Our Mission - NCBI | OK |
Incoming links10.0
1,637,497,405 pages link to this website
998,381 domains link to this website
- There are 1,637,497,405 pages on 998,381 domains linking to this website. The volume and quality of incoming links is known to influence a website's search engine ranking.
- To appear higher in search engine results, consider link building activity as a way to build your search ranking. Be careful though, because incoming links which are obviously artificial are likely to be detected by search engines and could have an adverse effect.
- Many of the domains that link to this website are hosted on servers with similar IP addresses. Search engines may ignore these incoming links or penalise this website's ranking as this behaviour can be an indicator of artificial link building.
Source: Ahrefs
URL format10.0
Every URL is well written
- This website uses appropriate web addresses (URLs) throughout. This is excellent and will help search engine placement, usability and the marketability of this website.
Popularity10.0
77027766Estimated monthly organic visitors
- This website appears to have a high number of monthly website visits each month
Source: Ahrefs
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