Privacy Policy

Last updated: January 1, 2026

MasterCheck is committed to protecting your privacy. This policy explains how we handle information when you use our service.

1. Audio Files

All audio analysis and conversion is performed entirely within your web browser using the Web Audio API and ffmpeg.wasm. Your audio files are never uploaded to, transmitted to, or stored on any server. They exist only in your device's RAM during processing and are discarded when you close or refresh the page.

2. Local Storage

We store a daily usage counter in your browser's local storage to enforce the free tier limit of 5 analyses per day. This data never leaves your browser and is automatically reset each day. You can clear this data at any time through your browser settings.

3. Analytics

We may use privacy-focused analytics to understand aggregate usage patterns. This data is anonymized and does not include any personally identifiable information or details about the files you process.

4. Advertising

We display advertisements through Google AdSense to support the free service. Google may use cookies to serve ads based on your prior visits to our site or other sites. You can opt out of personalized advertising by visiting Google's Ad Settings at google.com/settings/ads.

5. Cookies

We do not use cookies for tracking or analytics. Third-party advertising partners (Google AdSense) may set cookies in accordance with their own privacy policies.

6. Children's Privacy

Our service is not directed to children under the age of 13. We do not knowingly collect personal information from children under 13.

7. Changes to This Policy

We may update this Privacy Policy from time to time. Changes will be posted on this page with an updated date. Continued use of the service after changes constitutes acceptance of the updated policy.

8. Contact

If you have questions about this Privacy Policy, please contact us via our contact page.