Last updated: 23 May 2026
The protection of your personal data is important to us. In this Privacy Policy, we inform you in accordance with the EU General Data Protection Regulation (GDPR) about the type, scope and purpose of the processing of personal data on the website calcsi.com (hereinafter 'CalcSI' or 'this website'). CalcSI is a free collection of online tools (hash generators, converters, map tools, etc.). We follow a privacy-friendly approach: wherever technically possible, calculations are performed directly in your browser without your input being transmitted to our server.
The controller within the meaning of the GDPR and other national data protection laws of the EU member states as well as other data protection provisions is the operator of this website. The full contact details of the controller can be found in the Imprint. For data-protection-related questions you can contact us at any time by email at [email protected].
Every time this website is accessed, our hosting provider or CDN (Cloudflare) automatically collects information that your browser transmits to the server. The following data is collected in particular:
CalcSI privacy highlight: Practically all calculations in our tools (e.g. hash generation, JWT decoding, BMI calculation, unit conversion, colour conversion, etc.) take place entirely in your browser. Your inputs — text, numbers, files, passwords — are at no time transmitted to our server, stored there, or analysed. The JavaScript logic loads after the page is opened and all processing occurs locally on your device. We therefore cannot see what specific values you enter into the tools. Any exceptions are, if at all present, clearly indicated at the individual tool (e.g. when a tool requires an external API).
This website uses the content delivery network (CDN) and DDoS protection of Cloudflare, Inc. (101 Townsend St, San Francisco, CA 94107, USA). Cloudflare routes all traffic between your browser and our server and in doing so processes your IP address, request headers, geographic region (country level) and technical connection data. This is necessary to accelerate the delivery of the website, to defend against attacks (e.g. DDoS, bot traffic, SQL-injection attempts) and to ensure availability. Cloudflare may set a technically necessary security cookie (e.g. __cf_bm) that expires after a short time. The legal basis is Art. 6(1)(f) GDPR. A data processing agreement (DPA) has been concluded with Cloudflare; transfers of data to the USA take place on the basis of EU Standard Contractual Clauses and, where applicable, the EU-US Data Privacy Framework. You can find further information in the Cloudflare Privacy Policy.
This website uses Google AdSense, an advertising integration service provided by Google Ireland Limited (Gordon House, Barrow Street, Dublin 4, Ireland; parent company: Google LLC, 1600 Amphitheatre Parkway, Mountain View, CA 94043, USA). AdSense uses cookies and comparable technologies (e.g. advertising IDs, web beacons) to deliver ads, measure their delivery and — if consent has been given — show personalised advertising based on your interests. Personal data such as your IP address, device and browser information, approximate location, pages visited and click/interaction data are processed. These may be transferred to servers in the USA and stored there.
The legal basis for personalised advertising is your consent pursuant to Art. 6(1)(a) GDPR, which you can grant or refuse via our consent banner (compliant with TCF v2.2 of the IAB Transparency & Consent Framework). If you refuse consent or withdraw it, we operate AdSense in non-personalised mode (NPA); in this mode ads are served without profile building, but technically necessary data (e.g. IP) is still transmitted. You can deactivate personalised advertising at any time at adssettings.google.com. Transfers of data to the USA are safeguarded by EU Standard Contractual Clauses and the EU-US Data Privacy Framework. More information: policies.google.com/privacy and policies.google.com/technologies/ads.
We embed the Inter font via the Google Fonts webfont service (Google Ireland Limited, Gordon House, Barrow Street, Dublin 4, Ireland; as well as Google LLC, USA) from fonts.googleapis.com and fonts.gstatic.com. We want to be explicitly transparent here: when a page is loaded, your browser establishes a connection to Google's servers, in the course of which your IP address, user agent and referrer are transmitted and may be briefly stored in logs. In its judgment of 20 January 2022 (Case 3 O 17493/20), the Munich Regional Court ruled that embedding Google Fonts without consent can violate the right to informational self-determination.
Legal basis: we rely on our legitimate interest in a consistent, fast-loading appearance (Art. 6(1)(f) GDPR). We are working on hosting Google Fonts locally in the future in order to avoid data transmission. More information can be found in the Google Privacy Policy.
For the presentation and functioning of the website we embed various JavaScript libraries (including Bootstrap, jQuery, Vue 3, toastr.js, Bootstrap Icons) and associated CSS files via external CDNs, in particular:
cdn.jsdelivr.net — jsDelivr (operated by ProspectOne / Volentio JSD Limited)cdnjs.cloudflare.com — Cloudflare CDN for open-source librariesunpkg.com — npm package CDN (Cloudflare)Our own cookies: CalcSI itself does not set any tracking or marketing cookies. Only technically necessary values may be stored in your browser's local storage (e.g. the language last chosen, selected tool settings, your consent status for AdSense). These data remain exclusively in your browser and are not transmitted to our server.
Third-party cookies: Cookies may be set by embedded third-party services, in particular:
__cf_bm, bot protection)Some of our tools (e.g. Lifesaver Map, E-Mobility Map) display interactive maps. The following external services are used for this:
tile.openstreetmap.org). When the map is displayed, your IP address, the user agent and request details are transmitted to the tile server. Privacy policy: osmfoundation.org/wiki/Privacy_Policyoverpass-api.de, operated by Roland Olbricht). In this process, request parameters and your IP are transmitted to the server. No inputs beyond the search itself are transmitted.The contents of our website are hosted with the following provider: [PLEASE COMPLETE: hosting provider name and full address]. The hosting provider processes the server log files described in section 2 on our behalf (Art. 28 GDPR). A data processing agreement (DPA) has been concluded with the provider. Legal basis: Art. 6(1)(f) GDPR.
We store personal data only as long as is necessary for the purposes described in this privacy policy or as prescribed by statutory retention periods.
As a data subject, you have the following rights under the GDPR in particular:
An informal email to [email protected] is sufficient to exercise your rights. We will deal with your request promptly and may ask you for identity verification to ensure that the request actually originates from you.
We reserve the right to amend this Privacy Policy so that it always complies with the current legal requirements or in order to implement changes to our services, e.g. when introducing new services. The version available at the time of your visit to the website applies. In the event of material changes, we will additionally inform you in an appropriate form on the website (e.g. via a notification banner).
For questions, requests for information, withdrawals or other data-protection-related matters, you can contact us at any time:
Email: [email protected]
Postal address: see Imprint
This privacy policy was created with care. Should anything nevertheless remain unclear, we welcome your feedback at [email protected].