Privacy Policy

Last updated: 15 August 2026 · Deutsche Fassung

This English version is a convenience translation. In case of any discrepancy, the German version is the legally binding one.

This privacy policy informs you about the nature, scope and purpose of the processing of personal data when using calconverter.app (the „Service").

Controller: Jan Dzieciol, c/o COCENTER, Koppoldstr. 1, 86551 Aichach, Germany. Email: jan@calconverter.app

1. Data we collect

We do not collect registration data or personal data such as your name or email address. We only process your email address if you voluntarily sign up for service notifications (see section 7). To provide the Service, the following data is processed:

• Calendar URL: the Microsoft 365 calendar URL you submit is stored in our database in order to refresh the calendar data periodically.
• Calendar contents: the full content of the calendar (.ics data including events, times, locations, descriptions, attendees) is stored in our database.
• Access timestamps: we record when a calendar was created and last accessed.
• Server log files: when the site is accessed, the hosting provider automatically collects server log files (including IP address, date and time, requested resource, data volume and user agent). They serve secure and stable operation (Art. 6(1)(f) GDPR) and are deleted or anonymized after a short time.

2. Legal basis

• Art. 6(1)(b) GDPR: processing the calendar URL and contents is necessary to perform the Service you request.
• Art. 6(1)(f) GDPR: processing of access timestamps and server logs is based on our legitimate interest in the security and operation of the Service.
• Art. 6(1)(a) GDPR: your email address is processed for service notifications and product news only with your consent (section 7).

3. Purpose of processing

• Provide the Service: we store the calendar contents to serve them via the generated Google Calendar and iCloud subscription URLs.
• Keep calendars current: we fetch the content from your original URL periodically.
• Maintain operation: access logs and timestamps help us manage the database and automatically remove unused data.

4. Retention and deletion

Calendar contents and the original URL are stored on our server in Germany (IONOS, Montabaur).

• Data is stored as long as the calendar is actively used. A calendar is considered „active" if its subscription URL was accessed at least once within the last 180 days.
• Inactive calendars are deleted automatically: a cleanup service irreversibly deletes all calendar data that has not been accessed for 180 days.

5. Hosting and server location

The Service is hosted on servers of IONOS SE, Elgendorfer Str. 57, 56410 Montabaur, Germany. Calendar data is processed exclusively in Germany; for the optional email notifications we use Brevo with processing in the European Union (section 7). There is no transfer to third countries.

6. Cookies and analytics

All fonts are served locally. No advertising cookies and no analytics cookies are used. We only use one strictly necessary cookie to remember your language preference (German or English) — cookie „NEXT_LOCALE", lifetime up to 1 year. This cookie is strictly necessary for the language-correct function of the site and therefore exempt from consent under § 25(2)(2) TTDSG.

For anonymous audience measurement we use Umami, a privacy-friendly, cookieless web analytics tool that we self-host on our own infrastructure (analytics.streikwarner.de). Umami sets no cookies, builds no cross-device profiles and does not process personal data such as IP addresses in identifiable form. Only aggregated metrics are recorded (e.g. page views, approximate origin, referrer, browser and device type). The legal basis is Art. 6(1)(f) GDPR (legitimate interest in statistical analysis of usage). As no cookies are set and no personal profiles are created, no consent is required.

7. Email notifications (Brevo)

If you wish, you can sign up with your email address for service notifications (maintenance, important changes) and optionally for product news. Sign-up uses a double-opt-in process: you first receive a confirmation email and are only subscribed after clicking the confirmation link. The legal basis is your consent (Art. 6(1)(a) GDPR); you can withdraw it at any time via the unsubscribe link in every email or by writing to jan@calconverter.app.

For managing and sending these emails we use Brevo (Sendinblue GmbH, Köpenicker Straße 126, 10179 Berlin, Germany) as a processor under a data processing agreement; processing takes place in the European Union. Your email address is stored exclusively at Brevo, not on our own servers. Along with the address we transmit your language preference (German/English) and nothing else. No reference to a calendar you converted is transmitted; the mailing list holds no link between your address and a calendar.

8. Data security

• Encryption: all data is transmitted exclusively over encrypted HTTPS connections.
• Access protection: generated feed URLs use cryptographically random identifiers that cannot be guessed.
• Rate limiting: our API endpoints are protected against abuse.
• Database security: the database is not publicly reachable.

9. Your rights (Art. 15–21 GDPR)

You have the right at any time to:

• access (Art. 15), rectification (Art. 16), erasure (Art. 17),
• restriction (Art. 18), data portability (Art. 20), objection (Art. 21).

To exercise your rights: jan@calconverter.app

10. Right to lodge a complaint

You have the right to lodge a complaint with a data protection supervisory authority. The competent authority is: Bayerisches Landesamt für Datenschutzaufsicht (BayLDA), Promenade 18, 91522 Ansbach, Germany, www.lda.bayern.de.

11. Usage note

By using this Service you acknowledge that the full content of the calendar you provide is stored on our servers. We strongly advise against using the Service for calendars with sensitive or confidential information. You are solely responsible for the data you submit.

12. Changes to this privacy policy

We may update this privacy policy from time to time. Changes will be published on this page.

13. Contact

For privacy questions: jan@calconverter.app