Privacy Policy

Last Updated: April 2026

At solve-sudoku.io, we take your privacy seriously. This Privacy Policy explains how we handle information when you use our online Sudoku solving tool.

Information We Don't Collect

We believe in privacy by design. Our Sudoku Solver operates entirely in your browser, and we do not collect, store, or transmit the following:

• Your Sudoku puzzles or solutions
• Your solving history or statistics
• Personal information (name, email, address, phone number). We don't ask for any.
• Account credentials (we don't require accounts)
• Payment information (our service is completely free)
• Location data
• Device identifiers

How Our Solver Works

All puzzle solving happens locally in your web browser using JavaScript. When you enter a puzzle or generate a new one:

• All processing occurs on your device
• No puzzle data is sent to our servers
• No solving sessions are recorded or tracked
• Your progress is stored only in your browser's local memory during your session

Browser Storage

We may use your browser's local storage or session storage to:

• Remember your dark mode preference
• Maintain your current puzzle during your session
• Save interface preferences (like pencil mode settings)

This data never leaves your device and can be cleared at any time through your browser settings.

Cookies

Our website does not use cookies for tracking or analytics. We may use essential session cookies only if necessary for the basic functionality of the site, but this isn't the case yet.

Third-Party Services

We use Google Analytics for basic site performance monitoring. No personal data is collected or shared with Google.

Links to Other Websites

Our site may contain links to external resources for educational purposes. We are not responsible for the privacy practices of other websites. We encourage you to read the privacy policies of any external sites you visit.

Children's Privacy

Our service is appropriate for all ages. We do not knowingly collect any personal information from children or adults. Since we don't collect personal data at all, parents and guardians can feel confident about their children using our Sudoku Solver.

Changes to This Policy

We may update this Privacy Policy from time to time to reflect changes in our practices or for legal reasons. When we make changes:

• We will update the "Last Updated" date at the top of this page
• Significant changes will be prominently announced on our website
• Your continued use of the service after changes constitutes acceptance of the updated policy

Your Rights

Since we don't collect or store your personal information, there is no data for you to access, modify, or delete. You are in complete control of your experience:

• Clear your browser's local storage to remove any saved preferences
• Use private/incognito mode for completely anonymous sessions
• Stop using the service at any time without consequence

Data Security

Because all processing happens in your browser and we don't transmit or store your puzzle data, your information is as secure as your own device. We recommend:

• Keeping your browser updated with the latest security patches
• Using reputable antivirus software
• Being cautious when using public or shared computers

Contact Us

If you have questions about this Privacy Policy or our privacy practices, please visit our Contact page.

Consent

By using our Sudoku Solver, you consent to this Privacy Policy. Given that we don't collect personal information, your use of the service doesn't involve sharing any personal data with us.