Privacy Policy

Birth information and in-browser processing

Ziwei uses the birth date, time, and place you enter to calculate your Zi Wei Dou Shu chart. The calculation runs in your browser. Ziwei does not directly submit the birth details from the form to its server or save them to an account.

If you select “Save details in this browser,” your birth details are kept in the browser’s local storage. Otherwise, they are held temporarily in session storage so you can continue viewing your result in the current tab.

Cookies and advertising

Ziwei shows ads through Google AdSense. Third-party vendors, including Google, may use cookies to serve interest-based ads based on your prior visits to this and other sites.

You can opt out of personalized advertising at https://adssettings.google.com, and manage third-party advertising cookies at https://www.aboutads.info. Learn more about how Google uses advertising data at https://policies.google.com/technologies/ads.

Usage analytics

Ziwei may use Google Tag Manager and analytics tools to improve the service. Pages viewed, device and browser information, interactions within the service, cookies, or online identifiers may be processed under each provider’s policy.

The custom analytics events configured by Ziwei do not add your birth date, birth time, or birthplace as separate event fields. A shared-result URL does contain birth details and may be processed as described under “Sharing results” below.

Sharing results

When you choose link sharing, the birth date, birth time, gender, and birthplace identifier needed to reproduce the chart are encoded in the URL fragment after “#”. Encoding is not encryption.

Under the URI standard, a fragment is not sent to the web server in a normal page request. The complete link is still delivered to the share target you choose and to anyone who receives it, and scripts running on the shared-result page can access it. Share targets and analytics or advertising tools may process the URL under their own policies.

Shared links do not expire and cannot be revoked. Share only with people or services you trust. If you choose image sharing, the generated chart image and accompanying share text are delivered to the target you select.

Data retention and deletion

Birth details saved in the browser are removed when you use “Delete saved details” in the service or clear the site’s stored data. Temporary session-storage details are removed when the current tab session ends.

Deleting details from your device does not invalidate links you already shared, and Ziwei cannot delete copies retained by a share target or recipient.

Children's privacy

Ziwei is not directed at collecting personal information from any specific age group. Where guardian consent is required, we follow applicable law.

Changes to this policy

We may update this policy to reflect changes in law or the service, and will post any changes on this page.