sumatrapdfreader.org
Sumatra PDF — Free, Fast PDF Reader for Windows
Last scanned Jul 26, 2026, 11:19 AM
Overall score
Excellent
Summary
Download Sumatra PDF — a free, fast, lightweight PDF reader for Windows. This website is hosted on HETZNER-AS - Hetzner Online GmbH, DE. SEO is excellent (100/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100).
Download Sumatra PDF — a free, fast, lightweight PDF reader for Windows. Supports PDF, EPUB, MOBI, CBZ, DjVu, XPS, and CHM. No bloat, no ads.
- Germany
- Hosted on HETZNER-AS - Hetzner Online GmbH, DE
Top issues to fix
5 issues found · 2 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
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.
4 broken links on the page
SEOFix or remove broken links — they waste crawl budget and erode user trust.
SEO
0 issue(s) found
Performance
533 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
Download Sumatra PDF — a free, fast, lightweight PDF reader for Windows. Supports PDF, EPUB, MOBI, CBZ, DjVu, XPS, and CHM. No bloat, no ads.
Meta tags
- Title
- Sumatra PDF — Free, Fast PDF Reader for Windows
- Description
- Download Sumatra PDF — a free, fast, lightweight PDF reader for Windows. Supports PDF, EPUB, MOBI, CBZ, DjVu, XPS, and CHM. No bloat, no ads.
- Canonical
- https://www.sumatrapdfreader.org/free-pdf-reader
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
No technologies detected.
Hosting & CDN
- Hosting provider
- HETZNER-AS - Hetzner Online GmbH, DE
- CDN provider
- —
- IP address
- 138.201.51.123
- ASN
- AS24940 (HETZNER-AS - Hetzner Online GmbH, DE)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- www.sumatrapdfreader.org
- Valid from
- Jun 7, 2026
- Valid to
- Sep 5, 2026
- Days until expiry
- 38
- SAN domains
- www.sumatrapdfreader.org
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 3 · H3 0
Links
10 internal · 13 external · 4 broken
Images
12 total · 0 missing alt
Scripts / Styles
4 scripts · 1 stylesheets
JS / CSS size
15.3 KB · 26.3 KB
Page size
30.5 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 0
- sitemap.xml
- Found
- URLs in sitemap
- 86
SEO issues
No SEO issues detected.
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://sumatrapdfreader.org
- Final URL
- https://www.sumatrapdfreader.org/free-pdf-reader
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 533 ms
- HTML size
- 30.5 KB
- Redirect chain
- https://sumatrapdfreader.org → https://www.sumatrapdfreader.org/ → https://www.sumatrapdfreader.org/free-pdf-reader
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Frequently asked questions
- What technology does sumatrapdfreader.org use?
- We did not detect any specific technologies for sumatrapdfreader.org in the latest scan.
- Is sumatrapdfreader.org secure (HTTPS)?
- Yes. sumatrapdfreader.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 5, 2026.
- Who hosts sumatrapdfreader.org?
- sumatrapdfreader.org is hosted on HETZNER-AS - Hetzner Online GmbH, DE.
- What is sumatrapdfreader.org's SEO score?
- sumatrapdfreader.org scored 100/100 for SEO in the latest analysis (excellent).
- What is sumatrapdfreader.org's overall website score?
- sumatrapdfreader.org has an overall SiteGraph score of 91/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card