Privacy Policy

PDFuse ("the App", "we", "us", "our"), operated by Tranquil Mind Technology JSC, respects your privacy. This Privacy Policy explains what information we collect, how we use and share it, and the choices and rights you have. By using the App, you agree to this Policy.

PDFuse is a document scanner, reader and PDF toolbox: you can scan paper with the camera into a PDF, turn photos into a PDF, merge and split PDF files, export pages as images or as one long image, protect a PDF with a password or remove it, add text, images, watermarks, highlights, freehand drawing and handwritten signatures, bookmark and print files, and open PDF, Word, Excel, PowerPoint, text and image files stored on your device. You do not need to create an account to use it: the App has no login and no user profile. The App is free to download, is supported by advertising, and offers optional premium plans — a weekly or yearly auto-renewing subscription, or a one-time lifetime purchase — that remove ads and unlock premium features.

1. Information we collect

Information you provide The App has no account, no sign-up form and no user profile. If you contact us by email for support, we receive your email address and the content of your message.

Collected automatically and sent to our service providers (Google Firebase):

• App usage (app interactions) — which screens and tools are opened and how often, collected through Firebase Analytics.
• Crash logs and diagnostics — crash reports, error traces and technical performance data, collected through Firebase Crashlytics.
• Device and app identifiers — the Firebase app instance / installation identifier, used to count unique installations, deliver remote configuration and group crash reports.
• Push token — a Firebase Cloud Messaging registration token, so the App can receive notifications (you can turn notifications off in your device settings).
• Device information — device model, operating system version, language setting and App version.
• Approximate location — Firebase Analytics derives a coarse location (country or city level) from your IP address for aggregate usage statistics. The App does not request any location permission and never accesses your GPS location.

Collected automatically and sent to our advertising and attribution partners:

• Advertising ID — your Android advertising ID, plus identifiers generated by our advertising and attribution partners, used to serve and measure ads and to attribute app installs.
• Ad interaction and performance data — ad requests, impressions, clicks, ad revenue estimates and the ad format and placement shown (banner, native, interstitial and app-open ads), collected by Google AdMob, the mediation networks it selects, and Adjust.
• Network and device information — IP address, device model, operating system version, language, screen size, network type and time zone, used for ad delivery, frequency capping, fraud prevention and diagnostics.
• Approximate location derived from your IP address — coarse (country or region-level) location inferred by our advertising partners from your IP address.
• Install attribution data — referral and campaign information (for example the Google Play install referrer) collected by Adjust to measure which marketing campaign brought you to the App.
• Ad consent choice — your choices from the Google User Messaging Platform (UMP) consent form, stored on your device in IAB TCF format and passed to our advertising partners.

Purchase data If you buy a premium plan (weekly subscription, yearly subscription or the one-time lifetime purchase), the purchase is processed by Google Play Billing. We never see or receive your card or payment details; we only receive the purchase/subscription status needed to unlock premium features.

Processed only on your device (never uploaded to us):

• Your documents — every PDF, Word, Excel, PowerPoint, text and image file you open, scan, convert, merge, split, lock, unlock, edit, bookmark, print or sign is processed entirely on your device. We operate no document server: your files, their contents, the passwords you set on a PDF and the signatures you draw are never uploaded to us or to any third party.
• Camera (permission CAMERA, only when you use Scan to PDF) — the camera preview and the captured page are used on-device to build the PDF, and the result is saved to your device storage. We do not upload, store or share camera images.
• Photos you pick — images you select through the system photo picker are converted to PDF on your device. The App deliberately does not request broad media-library permissions (READ_MEDIA_IMAGES, READ_MEDIA_VIDEO and READ_MEDIA_AUDIO are explicitly removed from the App's manifest); picking images always goes through the Android Photo Picker.
• Device storage (READ_EXTERNAL_STORAGE, WRITE_EXTERNAL_STORAGE, MANAGE_EXTERNAL_STORAGE) — used to list, open and save documents and to let you manage the files you create, and to save exported images to your device gallery. The App reads a file only when you select it, open it with the App, or share a file into the App from another app; file contents are never transmitted.
• Files shared into the App — when you open or share a document from another app, that file is handled on your device only.
• App settings, bookmarks and recent files — your language, theme, bookmarks and recent-file list are stored locally (local database and app preferences).
• Home-screen widget and shortcuts — the optional Android home-screen widget and app shortcuts display your recent files from local storage only; no file data leaves the device for this feature.
• Notifications (POST_NOTIFICATIONS) — the App may show local reminder notifications, scheduled on your device.

The App does not collect your name, phone number, contacts, call logs, microphone audio, message content, health data or precise GPS location.

2. How we use information

• To provide and operate the App's scanning, viewing, conversion, merge/split, password, editing, printing and signing features.
• To remember your preferences, bookmarks and recent files between sessions, and to populate the home-screen widget and shortcuts.
• To display advertising in the free version, and to measure and optimise ad performance and revenue.
• To measure marketing campaigns and app-install attribution (Adjust).
• To process and restore your premium purchase and to remove ads for premium users.
• To understand how the App is used and improve it (analytics), and to deliver remote configuration of features and ad placements.
• To detect, diagnose and fix crashes and errors (diagnostics).
• To detect and prevent invalid traffic, ad fraud and abuse.
• To answer support requests you send us, and to comply with legal obligations.

We do not use the content of your documents for advertising, analytics, profiling or AI training. Document content never leaves your device.

3. Third-party services

Firebase and Google Play act as our service providers and process data on our behalf. Ads in the App are served by Google AdMob together with the mediation networks listed above; a mediation network receives data only when AdMob selects it to fill an ad request, so not every network listed will receive data from every device. There is no document-processing server, no cloud storage and no social login in the App.

Ad consent (EEA/UK and other regions where required). The App shows the Google User Messaging Platform (UMP) consent form, which asks for your choices about personalised advertising under the IAB Transparency & Consent Framework. Your choice is stored on your device and passed to our advertising partners. To change or withdraw your choice you can clear the App's data (Android Settings → Apps → PDFuse → Storage → Clear data) or reinstall the App, after which the form is shown again.

Resetting or limiting your advertising ID. On Android you can reset or delete your advertising ID, and opt out of ad personalisation, in Settings → Google → Ads (or Settings → Privacy → Ads, depending on your device).

4. How we share information

We do not sell your personal information for money. We share data only with the service providers and advertising partners listed in section 3, for the purposes described there; when required by law, legal process or a valid government request; and in connection with a merger, acquisition or other business transfer, in which case this Policy continues to apply to the transferred data.

Because the App can show personalised advertising, some U.S. state privacy laws (for example the CCPA/CPRA in California) treat sharing identifiers with advertising partners for targeted advertising as a "sale" or "sharing" of personal information. You can opt out at any time through the in-app consent form (where shown) and through your device's ad-personalisation setting described above.

5. Legal bases (EEA/UK — GDPR)

• Consent — personalised advertising, and analytics where consent is required.
• Legitimate interests — operating and securing the App, non-personalised advertising measurement, crash diagnostics and product improvement.
• Contract / legal obligation — processing and restoring your premium purchase, keeping records required by law.

6. Data retention

We keep data only as long as necessary for the purposes above or as required by law. Analytics and advertising identifiers are retained by our partners according to their own retention periods (typically up to 14 months for analytics event data and shorter windows for ad-request logs). Crash and diagnostic reports are kept for a limited period while we investigate and fix the issue. Data stored only on your device (documents, bookmarks, recent files, settings) remains until you delete it or uninstall the App.

7. Your rights

EEA/UK (GDPR). You have the right to access, correct, delete, port, object to or restrict processing of your personal data, to withdraw consent at any time, and to lodge a complaint with your data protection authority.

California and other U.S. states (CCPA/CPRA). You have the right to know what personal information is collected, to delete or correct it, to opt out of the sale/sharing of personal information and of targeted advertising, and not to be discriminated against for exercising these rights.

Other regions. Residents of Brazil (LGPD), Canada (PIPEDA) and other jurisdictions have equivalent rights under their local law.

To exercise any of these rights, email us at the address in section 13. Because the App has no account, we cannot identify you by name: please include your advertising ID and your device model and operating-system version so we can locate and act on the relevant data.

8. Children's privacy

The App is intended for users aged 13 and over and is not directed to children. We do not knowingly collect personal information from children under 13 (or under the applicable minimum age in your region, for example 16 in parts of the EEA). If you believe a child has provided us with personal information, contact us and we will delete it. In line with the Google Play Families policy, the App is not targeted at children and is not part of the Designed for Families programme.

9. International data transfers

Your data may be processed in countries other than your own, including the United States, where our service providers operate. Where required, these transfers rely on appropriate safeguards such as the European Commission's Standard Contractual Clauses or an adequacy decision.

10. Data security

Data sent to our service providers is encrypted in transit using HTTPS/TLS. Your documents stay in the App's storage on your device. We apply reasonable technical and organisational measures, but no method of transmission or storage is 100% secure.

11. Third-party content

Documents you open in the App come from your own device or from other apps you share them from; we do not control their content. Links inside documents may lead to third-party websites governed by their own terms and privacy policies — please review them before providing any information.

12. Changes to this Policy

We may update this Policy from time to time. Material changes will be posted on this page with a new "Last updated" date. Continuing to use the App after a change means you accept the updated Policy.

13. Contact us

Tranquil Mind Technology JSC No. 3, Alley 98, Vu Trong Phung Street, Thanh Xuan Ward, Hanoi City, Vietnam Email: contact@tranquilmind.co

© 2026 Tranquil Mind Technology JSC (@Tranquil Mind Technology JSC). All rights reserved.