What technology does htmlpurifier.org use?

htmlpurifier.org is built with Apache.

Is htmlpurifier.org secure (HTTPS)?

Yes. htmlpurifier.org uses TLS 1.2 with a certificate issued by Internet2, valid until Aug 18, 2026.

Who hosts htmlpurifier.org?

Hosting provider information for htmlpurifier.org is not available yet.

What is htmlpurifier.org's SEO score?

htmlpurifier.org scored 65/100 for SEO in the latest analysis (fair).

What is htmlpurifier.org's overall website score?

htmlpurifier.org has an overall SiteGraph score of 70/100, combining SEO, performance, security, and accessibility.

htmlpurifier.org

HTML Purifier - Filter your HTML the standards-compliant way!

Last scanned Jul 26, 2026, 1:19 PM

Overall score

Fair

Summary

HTML filter that guards against XSS and ensures standards-compliant output. This website uses Apache. SEO is fair (65/100) and accessibility is excellent (95/100). Security scores poor (25/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.

HTML filter that guards against XSS and ensures standards-compliant output.

Top issues to fix

13 issues found · 3 high priority

Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing viewport meta tag
Accessibility
Add <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
TLS certificate expires in 21 days
Security
Renew soon or enable auto-renewal to avoid a browser-warning outage.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.

+7 more issues — details in the sections below.

SEO

6 issue(s) found

100

Performance

1.00 s

Security

HTTPS & header checks

Accessibility

1 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

HTML filter that guards against XSS and ensures standards-compliant output.

Meta tags

Title: HTML Purifier - Filter your HTML the standards-compliant way!
Description: HTML filter that guards against XSS and ensures standards-compliant output.
Canonical
Language: en
Charset: UTF-8
Viewport
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

Apache

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 1.2
Issuer: Internet2
Subject: *.scripts.mit.edu
Valid from: Aug 18, 2025
Valid to: Aug 18, 2026
Days until expiry: 21
SAN domains: *.scripts.mit.edu

Security headers

Strict-Transport-SecurityMissing
Content-Security-PolicyMissing
X-Frame-OptionsMissing
X-Content-Type-OptionsMissing
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: none · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 8 · H3 4

Links

16 internal · 18 external · 20 broken

Images

1 total · 0 missing alt

Scripts / Styles

1 scripts · 2 stylesheets

JS / CSS size

0 B · 0 B

Page size

12.6 KB

Robots.txt & Sitemap

robots.txt: Not found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

Title longer than 60 characters
Missing canonical link
No structured data (JSON-LD) found
Missing OpenGraph tags
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://htmlpurifier.org
Final URL: https://htmlpurifier.org
HTTP status: 200
HTTP version: HTTP/1.1
Response time: 1.00 s
HTML size: 12.6 KB
Redirect chain: https://htmlpurifier.org

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does htmlpurifier.org use?: htmlpurifier.org is built with Apache.
Is htmlpurifier.org secure (HTTPS)?: Yes. htmlpurifier.org uses TLS 1.2 with a certificate issued by Internet2, valid until Aug 18, 2026.
Who hosts htmlpurifier.org?: Hosting provider information for htmlpurifier.org is not available yet.
What is htmlpurifier.org's SEO score?: htmlpurifier.org scored 65/100 for SEO in the latest analysis (fair).
What is htmlpurifier.org's overall website score?: htmlpurifier.org has an overall SiteGraph score of 70/100, combining SEO, performance, security, and accessibility.