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Privacy Policy

This policy describes how pdftheory collects, uses, and shares information about you when you use our services.

Effective: January 30, 2026Last updated: January 30, 2026

pdftheory (“we,” “our,” or “us”) respects your privacy and is committed to protecting your personal information. This Privacy Policy explains how we collect, use, share, and safeguard your information when you use our website pdftheory.com and our mobile application (together, the “Service”). By using our Service, you agree to the practices described in this Privacy Policy.

1. Information We Collect

We collect information you provide directly and information collected automatically when you use our Service.

1.1 Personal Information You Provide

When you use our Service, you may provide us with:

  • Name and contact information
  • Email address
  • Account login credentials
  • Payment information (if applicable)
  • Customer support interactions
  • Survey or feedback responses

1.2 Information Collected Automatically

When you access or use our Service, we automatically collect:

  • IP address and device information (device type, operating system, browser)
  • Location data (if you allow)
  • Usage data (pages visited, time spent, clicks, interactions)
  • Cookies, web beacons, and similar tracking technologies
  • Analytics data (via Google Analytics or similar services)

1.3 Files You Process

Important: Your files stay private

  • All PDF files processed via pdftheory remain local to your device.
  • Files are temporarily stored in memory during processing and never uploaded to our servers.

2. How We Use Your Information

We use the information we collect to:

  • Provide, maintain, and improve our Service
  • Manage your account and authentication
  • Process payments (if applicable)
  • Provide customer support
  • Deliver marketing communications (if consented)
  • Analyze usage trends and improve Service performance
  • Ensure security, detect fraud, and prevent abuse

3. Cookies and Tracking Technologies

We use cookies and similar technologies to improve functionality, analyze usage, and deliver relevant ads.

Cookie TypePurpose
Essential CookiesRequired for core functions (login, session management)
Analytics CookiesHelp us understand how users interact with the Service
Marketing CookiesDeliver personalized ads and measure ad performance

You can control cookies via your browser settings, but disabling essential cookies may limit Service functionality.

4. Sharing Your Information

We do not sell your personal information.

We may share your data only in the following circumstances:

  • With Service Providers: For analytics, hosting, or customer support
  • For Legal Compliance: To respond to legal requests, protect rights, or prevent fraud
  • With Business Partners or Affiliates: Only with appropriate safeguards
  • In Business Transactions: During mergers, acquisitions, or asset sales
  • With Consent: Only when you explicitly authorize sharing

5. International Data Transfers

Your information may be processed in countries outside your own, including the United States. We apply appropriate safeguards to ensure your data is protected according to applicable laws, including standard contractual clauses and other legally recognized transfer mechanisms.

6. Data Retention

  • We retain personal information for up to 2 years after your last activity, unless a longer period is required by law.
  • Usage and analytics data may be retained for up to 24 months.
  • Files processed through pdftheory are never stored beyond your active session.

7. Your Privacy Rights

Depending on your location, you may have the following rights regarding your personal information:

  • Access and correct your personal information
  • Delete your personal information
  • Withdraw consent to marketing communications
  • Object to or restrict processing
  • Data portability requests

To exercise your rights, contact us at privacy@pdftheory.com.

8. Children's Privacy

  • Our Service is not intended for children under 16.
  • We do not knowingly collect personal information from children under 16.
  • If we learn we have collected data from a child, we will delete it immediately.

9. Security

We implement industry-standard technical and organizational measures to protect your data from unauthorized access, disclosure, alteration, or destruction. These measures include encryption, secure data centers, and regular security assessments. However, no method of transmission over the Internet or electronic storage is 100% secure, and we cannot guarantee absolute security.

10. Advertising and Analytics

  • Advertisements are provided via partners such as Ezoic.
  • Our advertising partners may use cookies and tracking technologies for ad personalization and measurement.
  • We use analytics tools like Google Analytics to understand usage patterns and improve Service performance.

You can opt out of personalized advertising by visiting www.aboutads.info/choices or www.networkadvertising.org/choices.

11. AGPL-3.0 License Disclosure

Certain software components of pdftheory are licensed under the GNU Affero General Public License v3 (AGPL-3.0). When using or redistributing these components, you may access the full source code at: github.com/pdftheory

13. Changes to This Privacy Policy

We may update this Privacy Policy from time to time. When we make changes, we will revise the “Effective Date” at the top of this policy and post the updated policy on this page.

We encourage you to review this Privacy Policy periodically to stay informed about how we are protecting your information. Your continued use of the Service after any changes constitutes your acceptance of the updated policy.

14. Contact Us

If you have any questions about this Privacy Policy or our privacy practices, please contact us:

Mailing Address

pdftheory
123 Business St, Suite 400
San Francisco, CA 94105
United States

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