leiden.edu
Home - Leiden University
Last scanned Aug 24, 2026, 1:23 PM
Overall score
Great
Summary
Leiden University, The Netherlands, was founded in 1575 and is one of Europe’s leading international research universities. This website uses Google Analytics. SEO is fair (70/100) and accessibility is excellent (100/100). Security scores excellent (100/100) and performance excellent (90/100). Top issue: Meta description longer than 160 characters.
Leiden University, The Netherlands, was founded in 1575 and is one of Europe’s leading international research universities. It has seven faculties in the arts, sciences and social sciences, spread over locations in Leiden and The Hague. The University has over 6,500 staff members and 26,900 students…
Top issues to fix
7 issues found
1 cookie without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
Meta description longer than 160 characters
SEOTrim the meta description to under 160 characters to avoid truncation in search results.
Multiple H1 headings found
SEOKeep a single H1 per page and demote the others to H2/H3.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
sitemap.xml not found
SEOPublish an XML sitemap and reference it from robots.txt to speed up page discovery.
+1 more issue — details in the sections below.
SEO
5 issue(s) found
Performance
1.53 s
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
Leiden University, The Netherlands, was founded in 1575 and is one of Europe’s leading international research universities. It has seven faculties in the arts, sciences and social sciences, spread over locations in Leiden and The Hague. The University has over 6,500 staff members and 26,900 students…
Meta tags
- Title
- Home - Leiden University
- Description
- Leiden University, The Netherlands, was founded in 1575 and is one of Europe’s leading international research universities. It has seven faculties in the arts, sciences and social sciences, spread over locations in Leiden and The Hague. The University has over 6,500 staff members and 26,900 students…
- Canonical
- https://www.universiteitleiden.nl/en
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- —
- CDN provider
- —
- IP address
- —
- ASN
- —
DNS records
| Type | Value |
|---|---|
| A | — |
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Hellenic Academic and Research Institutions CA
- Subject
- www.universiteitleiden.nl
- Valid from
- Jul 22, 2026
- Valid to
- Feb 6, 2027
- Days until expiry
- 165
- SAN domains
- www.universiteitleiden.nl, www.luf.nl, staff.universiteitleiden.nl, universiteitleiden.nl, gtm.universiteitleiden.nl, www.organisatiegids.universiteitleiden.nl, www.library.universiteitleiden.nl, organisatiegids.universiteitleiden.nl, luf.nl, www.researchsupport.universiteitleiden.nl, researchsupport.universiteitleiden.nl, medewerkers.universiteitleiden.nl, bibliotheek.universiteitleiden.nl, www.student.universiteitleiden.nl, cms.universiteitleiden.nl, www.bibliotheek.universiteitleiden.nl, www.medewerkers.universiteitleiden.nl, library.universiteitleiden.nl, student.universiteitleiden.nl, www.staff.universiteitleiden.nl
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyEnabled
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyMissing
Compression: gzip · 3 cookie(s) observed
Content & assets
Headings
H1 2 · H2 7 · H3 0
Links
51 internal · 19 external · 11 broken
Images
7 total · 0 missing alt
Scripts / Styles
26 scripts · 1 stylesheets
JS / CSS size
7.4 KB · 65 B
Page size
23.5 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Meta description longer than 160 characters
- Multiple H1 headings found
- No structured data (JSON-LD) found
- robots.txt not found
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://leiden.edu
- Final URL
- https://www.universiteitleiden.nl/en
- HTTP status
- 200
- HTTP version
- HTTP/1.1
- Response time
- 1.53 s
- HTML size
- 23.5 KB
- Redirect chain
- https://leiden.edu → https://www.universiteitleiden.nl/en
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Frequently asked questions
- What technology does leiden.edu use?
- leiden.edu is built with jQuery, Google Analytics.
- Is leiden.edu secure (HTTPS)?
- Yes. leiden.edu uses TLS 1.3 with a certificate issued by Hellenic Academic and Research Institutions CA, valid until Feb 6, 2027.
- Who hosts leiden.edu?
- Hosting provider information for leiden.edu is not available yet.
- What is leiden.edu's SEO score?
- leiden.edu scored 70/100 for SEO in the latest analysis (fair).
- What is leiden.edu's overall website score?
- leiden.edu has an overall SiteGraph score of 89/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card