Privacy Policy

1. Privacy at a Glance

The following information provides a simple overview of what happens to your personal data when you visit this website. Personal data is any data with which you could be personally identified.

Data controller:

Stephan Baum
Represented by: Stephan Baum
Gutenbergstraße 88/1
Stuttgart, Germany
Email: kontakt@rechenportal.de

2. Hosting

This website is hosted by Vercel Inc., 440 N Barranca Ave #4133, Covina, CA 91723, USA. When you visit this website, your IP address and other data may be processed by the hosting provider. The use of the hosting provider is based on our legitimate interest in providing our online service securely and efficiently (Art. 6(1)(f) GDPR).

3. General Information and Mandatory Disclosures

Data Protection

The operators of this website take the protection of your personal data very seriously. We treat your personal data confidentially and in accordance with the statutory data protection regulations and this privacy policy.

Please note that data transmission over the Internet (e.g., communication by email) may have security gaps. Complete protection of data against access by third parties is not possible.

Storage Duration

Unless a more specific storage period has been stated within this privacy policy, your personal data will remain with us until the purpose for data processing no longer applies.

Revocation of Your Consent

Many data processing operations are only possible with your express consent. You may revoke any consent you have already given at any time. The legality of data processing carried out prior to revocation remains unaffected.

4. Data Collection on This Website

Cookies

This website uses cookies to store your preferences (e.g., cookie consent, calculator settings). Google may set technically necessary cookies for fraud prevention and frequency capping as part of ad delivery. Personalization cookies for advertising purposes are only set with your explicit consent. You can configure your browser to reject cookies.

Local Storage

We use your browser's localStorage to save your cookie preferences and calculator settings (e.g., selected federal state). This data is stored exclusively on your device and is not transmitted to us or third parties.

Calculations

All calculations on this website are performed entirely in your browser (client-side). No input data is transmitted to our servers or third parties. Your data never leaves your device.

Server Log Files

The hosting provider automatically collects and stores information in server log files that your browser transmits automatically. These include:

• Browser type and version
• Operating system used
• Referrer URL
• Hostname of the accessing computer
• Time of the server request
• IP address

This data is not merged with other data sources. Data collection is based on Art. 6(1)(f) GDPR.

5. Advertising (Google AdSense)

This website uses Google AdSense, a service provided by Google Ireland Limited, Gordon House, Barrow Street, Dublin 4, Ireland, to display advertisements.

Personalized and Non-Personalized Ads

We display advertisements on this website to fund the free operation of our calculators. We distinguish between two types of ads:

• Personalized ads: If you consent via our cookie banner, Google uses cookies and similar technologies to show you interest-based advertising.
• Non-personalized ads: If you decline consent, you will still see advertisements — however, these are based on the content of the page you are visiting, not on your browsing behavior. No tracking cookies for advertising purposes are set in this case. Google may still use cookies for fraud prevention and frequency capping.

When consent is declined, we enable Restricted Data Processing (RDP), which limits Google's use of your data to the legally permissible minimum.

Legal Basis

Personalized ads are served based on your consent (Art. 6(1)(a) GDPR). Non-personalized ads are served based on our legitimate interest in funding this free service (Art. 6(1)(f) GDPR).

You may withdraw your consent at any time by clearing your browser cookies. The cookie banner will reappear on your next visit.

For more information about Google's privacy practices, visit: https://policies.google.com/privacy