Privacy Policy

At PercentageDecreaseCalculator.com, we believe the most effective privacy policy is one built on zero data collection. This document explains how our static architecture safeguards your privacy, how client-side processing functions, and our strict limits regarding user information.

Summary of Core Principles: All mathematical calculations occur entirely within your browser's local memory. We do not transmit, log, sell, or analyze the numbers you calculate on this website.

1. Client-Side Computational Isolation

Unlike cloud calculation platforms that send your inputs to a remote backend API for evaluation, all mathematical engines on PercentageDecreaseCalculator.com execute purely on client-side JavaScript within your device's browser sandbox.

  • No Input Transmission: The numbers you enter into our calculators never leave your local device.
  • No Mathematical History Stored: We do not log, catalog, or create profiles based on the financial, medical, academic, or commercial values you compute.
  • Offline Functional Isolation: If you disconnect from the internet after loading a tool page, the calculator functions normally because all operational code is already running locally in your browser RAM.

2. Cookies & Local Storage Technology

PercentageDecreaseCalculator.com does not set marketing, profiling, or cross-site tracking cookies.

We utilize standard HTML5 localStorage solely for a single functional preference:

  • Storage Key: pdc_theme
  • Purpose: Saves your selected visual display theme (either light or dark mode).
  • Expiration: Persists locally on your device until manually cleared or overwritten by toggling the theme switch.
  • Zero Identifiers: This value contains no unique user IDs, IP references, or personal data.

3. Server Access Logging & Network Traffic

When you request a static web page or asset from our servers, standard web server access logs are generated automatically by our hosting infrastructure. These logs typically record:

  • The date and timestamp of the HTTP request.
  • The requested page URI (e.g., /percentage-point-calculator/).
  • The requesting IP address and browser User-Agent string.
  • The referring URL that directed you to the page.

These operational logs are maintained strictly for network security, DDoS mitigation, and error diagnosis. They are rotated and permanently purged on a routine 30-day schedule and are never correlated with calculation inputs or personal identities.

4. Communications via Contact Form

If you voluntarily submit an inquiry through our Contact Form, you provide your name, email address, and message text. This information is used strictly to respond to your technical question, bug report, or feature request. We never sell, lease, or distribute your email address to commercial marketing lists.

5. GDPR, CCPA & Statutory Consumer Rights

Under the General Data Protection Regulation (GDPR) and the California Consumer Privacy Act (CCPA/CPRA), users possess statutory rights concerning their personal data:

  • Right to Know / Access: Because we collect zero identifying data or user profiles during tool usage, we store no personal records to disclose.
  • Right to Erasure: Contact inquiry correspondence can be deleted upon written request.
  • Do Not Sell or Share My Information: We do not sell, rent, monetize, or share user data with third-party advertisers.

6. Policy Revisions & Data Controller

Any revisions to this Privacy Policy will be posted directly to this URL with an updated effective date.

Data Controller:
Jack Tyson • Founder & Full Stack Developer
PercentageDecreaseCalculator.com
Inquiries: Please reach out via our Contact Page.

Last Reviewed & Updated: October 8, 2026.