Your privacy matters. Here's how we protect it.
Effective Date: October 9, 2026
Welcome to MarkViewer. We are committed to protecting your privacy and being transparent about how we handle your data. This Privacy Policy explains what information we collect, how we use it, and your rights regarding your personal data.
MarkViewer consists of two components:
These components handle data differently, and we'll clearly distinguish between them throughout this policy.
Data Controller: Seungbin Baik
Email: seungbin.baik@gmail.com
GitHub: github.com/SeungbinBaik/markviewer-releases
For any privacy-related questions, data requests, or concerns, please contact us at the email address above.
When you visit our website, we collect the following information through Google Analytics:
Important: We do NOT require you to create an account or provide any personal information to use our website or download MarkViewer.
The app sends two kinds of data to PostHog, our analytics provider. They are separate and you control each in Settings > Privacy & Analytics.
These tell us which app versions have problems. They carry no identifier: each report gets a new random ID, nothing is stored on your device to recognize it later, and no profile is created. Reports cannot be linked to each other or to your Mac. You can turn them off in Settings at any time.
MarkViewer
<path> and file names by <file>ae (index-Bq3x.js:1:20431)), with directories removedUsage analytics are opt-in only. When you first launch the app, the setup screen asks whether to share anonymous usage data; the box starts unchecked. If you used MarkViewer before version 1.8.14, the app asks you once. Until you say yes, no usage data is collected. You can change this setting anytime in the app's Settings.
If you opt in, we also collect the following through PostHog:
We explicitly do NOT collect:
We use the collected data solely to:
We do NOT use your data for:
Under the General Data Protection Regulation (GDPR), we process your data based on:
Legitimate Interest - We have a legitimate business interest in understanding how our website is used to improve it and measure the effectiveness of our communication. You can opt-out via our cookie consent banner.
Legitimate Interest - We need to know which versions crash or fail in order to fix them. These reports carry no identifier and cannot be linked to you or your device. You can turn them off at any time in the app's Settings.
Explicit Consent - We only collect usage analytics from the desktop app if you explicitly opt in. You can withdraw your consent at any time through the app's Settings.
We use the following third-party services to process analytics data:
We do not sell, rent, or trade your data to any third parties. The services listed above are data processors working on our behalf, not data purchasers.
Google Analytics data is retained for 26 months (Google's standard retention period). After this period, the data is automatically deleted.
Usage analytics are retained until you request deletion. Anonymous error reports cannot be tied to you, so they cannot be looked up or deleted per user. You have full control:
You have the following rights regarding your data:
MarkViewer includes privacy controls in Settings > Privacy & Analytics:
We will respond to your privacy requests within 30 days as required by GDPR and CCPA.
We implement multiple security measures to protect your privacy:
MarkViewer is not directed at children under the age of 13. We do not knowingly collect personal information from children under 13.
If you are a parent or guardian and believe your child has provided us with personal information, please contact us at seungbin.baik@gmail.com, and we will delete that information immediately.
MarkViewer is developed and maintained by a developer based in South Korea. However, the analytics services we use (PostHog and Google Analytics) may transfer data to the United States.
If you are an EU resident and have concerns about international data transfers, you can opt-out of analytics entirely through the app's Settings.
We may update this Privacy Policy from time to time to reflect changes in our practices, technologies, or legal requirements.
Continued use of MarkViewer after changes to this Privacy Policy constitutes your acceptance of the updated policy. If you do not agree with the changes, you can opt-out of analytics or stop using MarkViewer.
If you have any questions, concerns, or requests regarding this Privacy Policy or your personal data, please contact us:
Email: seungbin.baik@gmail.com
GitHub Issues: github.com/SeungbinBaik/markviewer-releases/issues
Response Time: We aim to respond within 48 hours for general inquiries and 30 days for formal data requests (as required by GDPR/CCPA).
Thank you for trusting MarkViewer with your privacy. We're committed to protecting your data and being transparent about our practices.