Privacy Policy

Last Updated: June 2026

At Platform Fee Calculator, we take your privacy seriously. This policy outlines how we handle your information.

1. Data Collection

Your inputs stay on your device. All fee calculations are performed locally in your browser. No transaction details, costs, sale prices, profit numbers, or other data you type into a calculator ever leave your device or reach our servers.

What we do collect: When you visit this site, we use Google Analytics 4 (a third-party analytics service operated by Google LLC) to collect aggregate, anonymized usage data. This includes: pages visited, time on page, referring website, browser type and version, device category, screen resolution, and a truncated approximation of your geographic region (country / city level, derived from your IP address). Google Analytics sets first-party cookies on this domain via googletagmanager.com to distinguish unique users and sessions. The full IP address is not stored in our analytics logs; Google anonymizes it before storage.

We do not collect: your name, email address, account information, the specific values you enter into any calculator, or any information that directly identifies you as an individual.

2. Cookies and Tracking

First-party storage: We use the browser's localStorage only to remember your theme preference (light or dark mode) and any saved calculation inputs. This data is never sent to any server.

Third-party analytics cookies: Google Analytics 4 sets the following first-party cookies on platformfeecalculator.com:

  • _ga — distinguishes unique visitors (expires after 2 years)
  • _ga_<container-id> — persists session state (expires after 2 years)

How to opt out of Google Analytics on this site:

  • Install the Google Analytics Opt-out Browser Add-on from Google.
  • Use a content blocker such as uBlock Origin, Privacy Badger, or your browser's built-in tracking protection. The Google tag will not load for visitors blocking googletagmanager.com.
  • Enable your browser's "Do Not Track" or "Global Privacy Control" signal. We respect these signals where technically feasible.

For details on how Google processes analytics data, see the Google Privacy Policy and "How Google uses information from sites or apps that use our services".

3. Children

This site is not directed at children under 13, and we do not knowingly collect personal information from children. If you believe a child has provided information to our analytics, contact us and we will request its deletion from Google's records.

4. Third-Party Links

Our site contains links to official platform fee guides (eBay, Mercari, etc.) and to Google's policies. We are not responsible for the privacy practices of these external sites, and we encourage you to read their policies separately.

5. Changes to This Policy

We may update this policy as we add or change features. Material changes (e.g. a new analytics provider, additional data collection) will be reflected in the "Last Updated" date above. Continued use of the site after a change constitutes acceptance of the updated policy.

6. Contact

Questions about this policy or our data practices? Use the contact form.