Privacy policy

Last updated: 2026-10-06

Calculator data

Calculations run in your browser. Dates entered in the tools are not sent to Weeknumber.io by the code in this release.

Local storage

The site stores one first-party flag named weeknumber-visited to distinguish a first visit from a return visit. It contains no date, identifier or calculator input. You can remove it through your browser settings.

Visitor statistics

We use Cloudflare Web Analytics to count visits. It does not set cookies and does not identify individual visitors. We only see totals such as page views, popular pages, referring sites, browsers, countries and page-load speed. The tools also record anonymous in-page events (for example copy actions and downloads), but these are not sent to us or to any other service.

Advertising (Google AdSense)

Weeknumber.io is free to use and is funded by ads served by Google AdSense. Google and its partners may use cookies and similar technology to show ads, limit how often you see them, measure how they perform and prevent fraud. Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this website or other websites.

Personalized ads are shown only with your consent where the law requires it. Visitors in the European Economic Area, the UK and Switzerland see a consent message from Google, a Google-certified consent management platform, where you can accept, refuse or manage your choices, and you can change them later. Without consent, Google may still show non-personalized or limited ads, which can use cookies or similar technology for frequency capping, aggregated reporting and fraud prevention.

Read How Google uses information from sites or apps that use our services. You can turn off personalized ads from Google in Ads Settings. Dates you enter in the tools are not sent to Google. The week number badge image (/badge.svg) and the Week API responses do not carry ads.

Hosting

The site is delivered through Cloudflare, which processes technical data such as IP addresses to deliver pages and protect the site from abuse.

Contact

Privacy questions can be sent to info@weeknumber.io.