This policy explains how CheckDigitLab handles data when you use its website and tools. The site is owned and run by Shakeel Lodhi, referred to here as "we", "us" or "our". You can visit it at checkdigitcalculator.com.
1. Absolute Client-Side Processing
Your check digit calculations stay in your browser. This includes character conversion, checksum checks and SVG barcode drawing. These tasks run on your device using JavaScript.
- We do not record, transmit, or store the sequence of numbers, barcodes, or credit card digits you enter into our tools.
- No user accounts, logins, or authentication credentials are required to use the service.
- No financial data, account numbers, or proprietary SKU manifests leave your local workstation.
2. Operational Data & Zero Tracking
CheckDigitLab operates with a strict zero-tracking, zero-analytics, and zero-cookie architecture:
- Zero Tracking & Zero Cookies: We do not set any tracking cookies, profiling cookies, advertising cookies, or analytics scripts (no Google Analytics, no Tag Manager, no Meta Pixel, no Mixpanel). We do not build profiles or monetize user traffic data.
- No User Account or Registration: You never need to register, provide an email, or sign in to use any feature of this website.
- Transient Edge Infrastructure Logs: When you access this website, standard HTTP connection metadata (such as your IP address, user-agent header, requesting path, and timestamp) is processed ephemerally by our edge hosting provider solely for transmitting web pages, mitigating DDoS attacks, and ensuring reliable routing. We do not store or inspect these server logs for personal identification.
- Feedback & Correspondence: If you voluntarily reach out via our contact page or email, your email address and message contents are received solely to answer your questions and are never shared or sold.
3. Local Device Storage
Any interactive settings (such as your chosen calculation format or selected algorithm mode) are processed strictly in your browser's temporary local session memory. Nothing is ever synchronized with or uploaded to any remote server or ad network.
4. External Assets & Third-Party Delivery
This website is statically generated and served globally over encrypted SSL/TLS connections. Web typography is loaded from Google Fonts (fonts.googleapis.com and fonts.gstatic.com); when requested by your browser, Google receives standard HTTP connection details in accordance with the Google Privacy Policy. If your browser blocks third-party fonts, the website automatically falls back to system fonts without any loss of functionality. Inquiries submitted through our contact form are delivered securely via our configured form gateway or direct email solely to pass correspondence to our support team.
5. Your Rights
Depending on where you live (for example under the EU/UK GDPR or the California Consumer Privacy Act), you may have the right to access, correct, delete or receive a copy of personal data we hold about you, to object to or restrict its processing, and to lodge a complaint with your local data protection authority. In practice the only personal data we may hold is the content of messages you send us; we will action any such request within 30 days.
6. Data Retention
Correspondence sent through the contact form or by email is kept only as long as needed to answer it and for a maximum of 24 months, after which it is deleted. Hosting logs are retained by our infrastructure provider for a short rolling period for security purposes.
7. Children's Privacy
This website is a general-purpose technical tool and is not directed at children under 13. We do not knowingly collect personal information from children.
8. Policy Updates & Contact
We may update this policy periodically to reflect additions of new calculation standards or changes in statutory compliance; the "Last updated" date above always shows the current version. For privacy questions or to exercise your rights, email support@checkdigitcalculator.com or use our contact page.