What technology does zotero.org use?

zotero.org is built with Apache.

Is zotero.org secure (HTTPS)?

Yes. zotero.org uses TLS 1.3 with a certificate issued by Amazon, valid until Oct 31, 2026.

Who hosts zotero.org?

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

What is zotero.org's SEO score?

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

What is zotero.org's overall website score?

zotero.org has an overall SiteGraph score of 77/100, combining SEO, performance, security, and accessibility.

zotero.org

Zotero | Your personal research assistant

Last scanned Jul 21, 2026, 12:33 PM · 2 views

Overall score

Fair

Top issues to fix

10 issues found · 2 high priority

Over half of images are missing alt text
Accessibility
Add alt attributes to images — screen readers depend on them, and they help image SEO.
Slow estimated load (12.8s)
Performance
Use a CDN, enable caching/compression, and cut render-blocking assets — every extra second costs conversions.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing canonical link
SEO
Add <link rel="canonical"> so search engines know which URL variant to index.
Multiple H1 headings found
SEO
Keep a single H1 per page and demote the others to H2/H3.
No structured data (JSON-LD) found
SEO
Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.

+4 more issues — details in the sections below.

Summary

Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research. This website uses Apache. SEO is fair (65/100) and accessibility is fair (70/100). Security scores excellent (95/100) and performance good (80/100). Top issue: Missing canonical link.

SEO

6 issue(s) found

Performance

12.84 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.

GitHub

Meta tags

Title: Zotero | Your personal research assistant
Description: Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Canonical
Language: en
Charset: utf-8
Viewport: width=device-width, initial-scale=1, shrink-to-fit=no
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 1.3
Issuer: Amazon
Subject: zotero.org
Valid from: Apr 17, 2026
Valid to: Oct 31, 2026
Days until expiry: 102
SAN domains: zotero.org, *.zotero.org

Security headers

Strict-Transport-SecurityEnabled
Content-Security-PolicyEnabled
X-Frame-OptionsEnabled
X-Content-Type-OptionsMissing
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 2 · H2 7 · H3 0

Links

17 internal · 8 external · 5 broken

Images

9 total · 6 missing alt

Scripts / Styles

4 scripts · 1 stylesheets

JS / CSS size

3.2 KB · 100 B

Page size

44.0 KB

Robots.txt & Sitemap

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

SEO issues

Missing canonical link
Multiple H1 headings found
No structured data (JSON-LD) found
Missing OpenGraph tags
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://zotero.org
Final URL: https://www.zotero.org/
HTTP status: 200
HTTP version: HTTP/2
Response time: 12.84 s
HTML size: 44.0 KB
Redirect chain: https://zotero.org → https://www.zotero.org/

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Frequently asked questions

What technology does zotero.org use?: zotero.org is built with Apache.
Is zotero.org secure (HTTPS)?: Yes. zotero.org uses TLS 1.3 with a certificate issued by Amazon, valid until Oct 31, 2026.
Who hosts zotero.org?: Hosting provider information for zotero.org is not available yet.
What is zotero.org's SEO score?: zotero.org scored 65/100 for SEO in the latest analysis (fair).
What is zotero.org's overall website score?: zotero.org has an overall SiteGraph score of 77/100, combining SEO, performance, security, and accessibility.