Privacy Policy

Last Updated: September 18, 2026

Welcome to Block Poster("we", "our", or "us"). We value your trust and are deeply committed to protecting your privacy. This Privacy Policy explains how our website operates, what minimal information may be processed, and how your data and uploaded content are protected when you use our services at blockposter.org.

1. 100% Client-Side Processing

Block Poster is built from the ground up as a browser-first, client-side application:

Zero Server Uploads: When you upload photos or graphics to create block posters, split images, or generate PDF layouts, all rendering, slicing, cropping, and PDF compilation take place directly in your web browser using local HTML5 Canvas and client-side processing.
No File Storage: Your images and documents are never transferred, processed, or stored on our servers or cloud infrastructure.
You maintain complete control of your creative files at all times.

2. No Account Required

We believe in friction-free, anonymous utility:

No Sign-Up: You can access and utilize all core tools without registering an account or creating a profile.
We do not collect passwords, identity cards, phone numbers, or profile information for basic tool usage.

3. Information We Collect and How We Use It

Because our tool runs locally, we collect very limited information:

A. Contact Form Inquiries

If you choose to communicate with us using the online contact form available on our website, we only collect the information you voluntarily submit (such as your inquiry details, feedback, or bug reports). We use this information solely to:

Respond to your inquiries or technical questions.
Troubleshoot bugs and investigate report issues.
Improve our website and tools.

B. Anonymous Usage & Analytics

We may use standard third-party analytics tools (such as Google Analytics) to gather aggregated, non-personally identifiable diagnostic information. This may include:

Browser type and version, operating system, device category.
Referring URLs, page visit counts, approximate geographic region (country/city level), and general site interactions.

This aggregate data is used strictly to diagnose technical faults, optimize site loading speed, and guide future feature development. It is never linked to your personal identity or image contents.

4. No Sale or Brokering of Personal Data

We do not sell, rent, or trade your personal data.
We do not monetize or broker user files or images.
We may only disclose limited data if strictly required to do so by law, valid legal subpoenas, or when necessary to protect the legal rights and safety of our service and users.

5. Cookies and Local Storage

Cookies: We or our measurement partners may use standard cookies to analyze general site traffic trends and measure website performance.
Browser Preferences: We may utilize browser LocalStorage solely to remember your on-screen UI preferences (such as your chosen paper sizes or margin settings) for your convenience.
You can disable or clear cookies through your browser settings at any time without affecting your ability to generate posters.

6. Third-Party Links & External Services

Our website may occasionally link to external third-party resources or community platforms. These external destinations have their own independent privacy terms and data practices. We encourage you to review the privacy policies of any third-party websites you visit.

7. Changes to This Privacy Policy

We may periodically update this Privacy Policy to reflect technical upgrades, new features, or changing legal guidelines. Any updates will be published on this page with an updated "Last Updated" date. Your continued use of the website following changes indicates your acceptance of the updated policy.

8. Contact Us

If you have questions, feedback, or suggestions regarding this Privacy Policy or our privacy practices, please reach out to us directly through our website's Contact Form.