w3schools.com
W3Schools Online Web Tutorials
Last scanned Jul 18, 2026, 8:49 PM
Overall score
Great
Top issues to fix
10 issues found · 1 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
TLS certificate expires in 28 days
SecurityRenew soon or enable auto-renewal to avoid a browser-warning outage.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Meta description longer than 160 characters
SEOTrim the meta description to under 160 characters to avoid truncation in search results.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
+4 more issues — details in the sections below.
Summary
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more. This website uses Google Analytics hosted on AKAMAI-ASN1 - Akamai International B.V., NL. SEO is fair (70/100) and accessibility is excellent (100/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Meta description longer than 160 characters.
SEO
5 issue(s) found
Performance
138 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- W3Schools Online Web Tutorials
- Description
- Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
- Canonical
- Language
- en-US
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
- https://www.w3schools.com:443/site.webmanifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- AKAMAI-ASN1 - Akamai International B.V., NL
- CDN provider
- —
- IP address
- 23.54.81.115
- ASN
- AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME |
|
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- certification.w3schools.com
- Valid from
- May 18, 2026
- Valid to
- Aug 16, 2026
- Days until expiry
- 28
- SAN domains
- certification.w3schools.com, kte9uk46s.w3schools.com, localdev.w3schools.com, ssf18kfg1.w3schools.com, try.w3schools.com, tryit.w3schools.com, tryphp.w3schools.com, www.w3schools.com
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyEnabled
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 18 · H2 68 · H3 7
Links
113 internal · 70 external · 1 broken
Images
29 total · 0 missing alt
Scripts / Styles
26 scripts · 6 stylesheets
JS / CSS size
896 KB · 45.4 KB
Page size
240 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 5
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Meta description longer than 160 characters
- Missing canonical link
- Multiple H1 headings found
- No structured data (JSON-LD) found
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://w3schools.com
- Final URL
- https://www.w3schools.com:443/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 134 ms
- HTML size
- 240 KB
- Redirect chain
- https://w3schools.com → https://www.w3schools.com:443/
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Frequently asked questions
- What technology does w3schools.com use?
- w3schools.com is built with Google Analytics.
- Is w3schools.com secure (HTTPS)?
- Yes. w3schools.com uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Aug 16, 2026.
- Who hosts w3schools.com?
- w3schools.com is hosted on AKAMAI-ASN1 - Akamai International B.V., NL.
- What is w3schools.com's SEO score?
- w3schools.com scored 70/100 for SEO in the latest analysis (fair).
- What is w3schools.com's overall website score?
- w3schools.com has an overall SiteGraph score of 85/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card