Privacy Policy

1. Introduction

Welcome to Calcon (“we”, “our”, “us”). This Privacy Policy explains how we collect, use, and protect your information across both of our products:

• the Calcon website at https://calcon.in; and
• the Calcon Android app, published on Google Play under the package name com.vgtech.calcon.

The two are separate products with different data practices, so this policy scopes each section. Sections 2–5 describe the website. Section 6 describes the Android app. Sections 7–13 apply to both unless a section says otherwise.

2. Information We Collect (Website)

• Automatically collected: IP address, browser type, device info, pages visited.
• Analytics: Aggregated stats via tools like Google Analytics, on the website, only if you consent.
• User input: Name, email, or messages submitted via contact forms.

2.1 Files you upload to tools

Most Calcon tools run entirely in your browser, and your files never leave your device. These tools upload your file to our processing server:

• PDF Compressor
• PDF Password Protector
• PDF Password Remover
• PDF to Word Converter
• PDF to Excel Converter
• Word to PDF Converter
• Excel to PDF Converter
• Excel Password Remover
• Image Compressor
• Image to Text (OCR)

Files are sent over an encrypted (HTTPS) connection to our processing server, hosted by Railway in Singapore. They are processed in temporary storage and deleted as soon as processing finishes. We do not keep copies, use them for anything else, or share them.

Passwords you enter in the password tools are used only to process that file and are not saved.

Our hosting providers may keep standard request logs (such as IP address, time and status), but not the contents of your files.

3. How We Use Your Information (Website)

• To improve our tools and platform performance.
• To respond to user inquiries and feedback.
• To analyze usage trends and site functionality.

We do not sell your personal data to third parties.

4. Cookies & Tracking (Website)

The website uses cookies for essential functionality and analytics. You may accept or reject cookies using the banner or your browser settings. The Android app does not use cookies; see Section 6 for how the app handles analytics.

5. Third-Party Services (Website)

• Google Analytics: For anonymous traffic analytics.
• Form services: If used, your message is securely processed and sent to our inbox.
• Railway: File processing. Hosts the server that processes files for the tools listed in Section 2.1.

6. Calcon Android App (com.vgtech.calcon)

This section applies to the Calcon Android app only. The app requires no account and no sign-up, and it works without you giving us any personal information. Every app tool runs entirely on your phone, except the two tools described in Section 6.5, which upload your file for processing.

6.1 What the app collects

The app uses Firebase / Google Analytics to collect anonymous usage analytics, so we can see which tools people actually use and where the app needs work. That is limited to:

• Which tools are opened and which features inside them are used.
• Aggregate usage counts — for example, how many times a tool was opened.
• General device information such as device model, operating system version, app version, language and country.
• An app instance identifier generated by Firebase, used to produce aggregate usage statistics.

This data is anonymous and is used in aggregate. It is processed by Google as part of Firebase / Google Analytics — see Google’s Privacy Policy.

The app does not collect the Android Advertising ID. The permission that allows apps to read it is removed from the app, Firebase’s collection of it is turned off, and Firebase is set not to use analytics data for ad personalisation. The app shows no ads.

The two tools that upload files also send a small amount of technical data to our processing server, and record a limited set of analytics events. Both are described in Section 6.5.

6.2 What the app does not collect

• No account and no personal information. There is no sign-up or login. We do not collect your name, email address, phone number, contacts, photos or location. An image you choose to compress is processed and deleted as described in Section 6.5, not kept.
• None of the data you enter into a tool. Your calculation inputs and results, such as amounts, rates, dates, text, or anything else you type or paste into a tool, are processed on your device and are not sent to us or to any third party. The only exceptions are the Image Compressor and PDF Compressor, which upload the file you choose for processing (see Section 6.5). (Some tools may offer an optional link to open the calcon.in website in your browser for additional features. Anything you do on the website is covered by the website sections of this policy, not this app section.)

We do not sell any of the data the app collects.

6.3 How to opt out of analytics

Usage analytics is on by default, and the app does not currently have a setting to turn it off. Because the app does not use the Android Advertising ID, Android’s advertising ID controls (such as ‘Delete advertising ID’) do not change what the app collects.

6.4 Where your data is kept

The app stores tool data locally on your device. There is no Calcon account to sign in to, and no Calcon server keeps your tool data. Files uploaded by the two tools in Section 6.5 are held on our processing server only in temporary storage while they are processed, and are then deleted.

6.5 Tools that upload files

Two app tools upload your file to our processing server:

• Image Compressor
• PDF Compressor

These tools use the same processing server as the website tools, and your file is handled in the same way, as described in Section 2.1. The app sends your file under a generic name (upload.jpg or upload.pdf), not your own file name. Before your first upload, the app shows a one-time notice, and these tools are marked “Needs internet” in the app.

• Confirming the request comes from the Calcon app: the app uses Firebase App Check with Google Play Integrity to confirm that upload requests come from the genuine Calcon app. For this, Google receives device and app integrity signals. See Google’s Privacy Policy.
• Usage limits: the app creates a random install ID that is not linked to your name, email, account or advertising ID. It is sent with uploads only so that we can apply usage limits. Our server also uses your IP address briefly for the same purpose. Neither the install ID nor your IP address is written to our application logs. Usage-limit counters are held in memory and reset when the server restarts. Our hosting providers may keep standard request logs, as described in Section 2.1.
• Analytics: for these tools, analytics records only which tool was used, a file-size range, whether processing succeeded or failed, and the type of failure. It never records file names, file contents or exact file sizes.

6.6 Third-party services (App)

• Firebase / Google Analytics: Anonymous usage analytics, as described in Sections 6.1 and 6.5.
• Railway: File processing. Hosts the server that processes files for the two tools listed in Section 6.5.
• Firebase App Check and Google Play Integrity: Confirm that upload requests come from the genuine Calcon app, as described in Section 6.5.

7. Data Retention

Website: we retain server logs for 30 days, and contact messages only as long as needed to serve your request.
App: analytics data is held by Google under the Firebase Analytics data-retention settings for our project. It is not stored on Calcon servers. Files uploaded by the Image Compressor and PDF Compressor are deleted when processing finishes, and usage-limit counters are held in memory only (see Section 6.5).

8. Your Rights

You have the right to access, modify, or delete your personal data. To make a request, please email us at support@calcon.in.

9. Children’s Privacy

Neither the Calcon website nor the Calcon Android app is intended for children under the age of 13. We do not knowingly collect personal information from children.

10. Data Security

We use HTTPS encryption, firewall protection, and limited access controls to safeguard your data.

11. International Transfers

Your data may be processed outside of your country. We ensure legal safeguards are in place to comply with data protection laws.

12. Policy Updates

We may revise this policy. The “Last updated” date will always reflect the most recent changes. Continued use of our site means you accept those changes.

13. Contact Us

If you have questions about this Privacy Policy — for either the website or the Calcon Android app — please contact us at:
Email: support@calcon.in