Privacy Policy

Last updated: November 11, 2026

1. Who We Are

Percentage Increase Calculator ("we", "us", "the site") is a free, open-source, client-side calculation tool available at percentageincreasecalculator.app. This Privacy Policy describes how we handle information when you use our site. We take your privacy seriously — and the short version is: we collect very little, and never the numbers you type.

2. Information We Do NOT Collect

Because this tool runs entirely in your web browser, we want to be explicit about what we do not do:

• We do not collect or transmit any values you enter into the calculator. All calculations happen locally on your device. Your last 10 results are saved automatically in your own browser only, for "Recent Calculations" (see section 4).
• We do not require or offer user accounts, email addresses, passwords, or any form of registration.
• We do not build a profile about you or try to identify who you are. Our analytics only show aggregated usage (see section 5).
• We do not sell, rent, or share any data with third parties for advertising or marketing purposes.
• We do not use retargeting pixels, social media trackers, or advertising networks.

3. Information That May Be Collected Automatically

When you visit any website, certain technical information is exchanged between your browser and the server as part of how the internet works. This may include:

• IP address — Your IP address may be temporarily logged by our hosting provider for security and operational purposes (e.g., DDoS protection). We do not access or analyze these logs ourselves.
• HTTP request data — Standard information such as the page requested, referring URL, browser type, operating system, and timestamp may be recorded by the server infrastructure.

This data is handled by our hosting infrastructure and is not used by us for tracking or user profiling. Separately, we use Google Analytics to understand aggregated usage, as described in section 5.

4. Cookies and Local Storage

Local storage (Recent Calculations). After you calculate a result, the calculator saves your last 10 results (original value, new value and percentage) in your browser's local storage under the key pic_history, so you can reload them later. This data never leaves your device and is not sent to us or anyone else. You can delete it at any time with the "Clear" button or by clearing your browser's site data.

Local storage (decimal places). If you choose a number of decimal places, that choice (0–4) is saved under the key pic_dp so the calculator remembers it next time. It also stays on your device.

Share links. When you press "Share link", the calculator creates a web address containing your original and new values, plus the currency symbol if you typed one (for example ?from=80&to=100). That link only goes where you choose to send it. Our analytics record page addresses without these values.

Cookies. Google Analytics may set cookies to tell new visitors from returning ones. Visitors in the European Economic Area, the United Kingdom and Switzerland, and anyone whose browser sends a Global Privacy Control or Do Not Track signal, get no analytics cookies. For details, please see our Cookie Policy.

5. Third-Party Services

We use a minimal number of third-party services to operate this site:

• Google Fonts — We load the Nunito and Sriracha typefaces from Google's font delivery network. When your browser requests these fonts, Google receives your IP address and standard HTTP headers. Google states that it does not use this data for advertising. For details, see Google Fonts Privacy FAQ and Google's Privacy Policy.
• Google Analytics 4 — We use Google Analytics to measure how the site is used: pages viewed, time spent, approximate location (country and city level), device and browser type, the site that referred you, and simple tool events such as "a result was calculated", "a result was copied" or "a share link was created". The values you enter are never sent. Advertising features, Google signals and ad personalization are turned off. Google processes this data under Google's Privacy Policy; you can also install the Google Analytics Opt-out Browser Add-on.
• Feedback form — Only when you choose to send feedback, the text you write, this site's domain and the page path (without any query string or fragment) are sent to our feedback service, which runs on Supabase in the Singapore region, and stored so we can read it and fix problems. To stop abuse, the service limits how many messages one connection can send per hour; for that it keeps a salted hash of your IP address for about an hour, not the address itself. Please don't include passwords or other private details. We read every message, but the form has no way for us to reply.
• Hosting Provider — Our site is served through a hosting provider that may process server access logs containing IP addresses and request metadata for security and uptime purposes.
• GitHub — Our source code is hosted on GitHub. If you visit our GitHub repository through links on this site, GitHub's privacy policy applies.

6. Data Retention

Calculator history stays in your browser until you clear it; we never receive it. Feedback messages are kept in the feedback service so we can track what has been fixed. Google Analytics data is kept for the retention period set in our Analytics account (the standard setting of 2 months for user-level data) and is then deleted automatically; aggregated reports may be kept longer. Any server logs maintained by our hosting provider are subject to their own retention policies and are typically rotated automatically within a short period.

7. Children's Privacy

This site is a general-purpose mathematical tool suitable for all ages. We do not knowingly collect personal information from anyone, including children under the age of 13 (or the applicable age of digital consent in your jurisdiction). Since we do not collect personal data, there is no children's data to manage.

8. International Users

This site may be accessed from anywhere in the world. Since calculations are performed entirely in your browser with no data transmitted to us, there is no cross-border data transfer of your calculator inputs. Analytics data is processed by Google, which may store it on servers outside your country, including in the United States. Server-level data (such as IP addresses in access logs) may be processed in the country where our hosting infrastructure is located.

9. Your Rights

Depending on your jurisdiction, you may have rights regarding your personal data, including the right to access, correct, delete, or restrict processing. We do not hold any data that identifies you by name or email, and your calculator history exists only in your own browser, where you can delete it yourself. For analytics data, you can block it with the opt-out add-on or a Global Privacy Control signal. If you have concerns, please contact us and we will do our best to assist.

10. External Links

This site contains links to third-party websites (such as GitHub and Google). We are not responsible for the content or privacy practices of those sites. We encourage you to read their privacy policies before providing them with any personal information.

11. Security

We take reasonable measures to protect the integrity of this site, including serving all pages over HTTPS. However, no method of transmission over the internet is 100% secure. Since the tool processes data locally in your browser, your calculation data is never exposed to network transmission risks.

12. Changes to This Policy

We may update this Privacy Policy from time to time to reflect changes in our practices or for legal, operational, or regulatory reasons. When we make changes, we will update the "Last updated" date at the top of this page. We encourage you to review this page periodically. Your continued use of the site after changes are posted constitutes acceptance of the updated policy.

13. Contact Us

If you have any questions, concerns, or requests regarding this Privacy Policy, please use the Give feedback button at the bottom of any page, or open an issue on our GitHub repository. The feedback form can't send replies, so open a GitHub issue if you need an answer.