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PDF HankoSign, stamp and scan PDFs in one app.
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PDF Hanko

Privacy policy

Last updated: October 9, 2026

PDF Hanko processes your documents on your device and never sends them to us. This page explains the permissions it uses and where your data is kept.

PDF Hanko ("the app") is a PDF app made by Z-SOFT CO., LTD ("we"). It is built offline first: editing, stamping, scanning and text recognition all happen on your device. We run no server, and we never receive your documents or your personal information.

The data, item by item

1. What the app handles, and where it is kept

Nothing leaves your device unless you share, export or send it yourself.

  • PDF documents

    The app's storage on your device. On iPhone they also appear in the Files app under PDF Hanko.

    Stays on your deviceOnly when you share, export, print or send to a nearby device

  • Edits (drafts)

    A draft file per document, on your device. The original PDF is unchanged until you save.

    Stays on your device

  • Stamps and signatures

    On your device, as images and stroke data.

    Stays on your device

  • My profile (name, address…)

    On your device only, for form autofill.

    Stays on your device

  • Scans and OCR results

    Processed on your device and saved as PDFs and search text. OCR uses the operating system's on-device text recognition.

    Stays on your device

  • Settings and App Lock

    In the app's settings on your device. Biometric data never reaches the app.

    Stays on your device

  • Passwords of encrypted PDFs

    Used only while encrypting; the app does not keep them.

    Stays on your device

  • Files sent to nearby devices, and your display name

    Files go directly to the other device on the same Wi-Fi, never through a server. The display name and a random device ID are kept on your device and announced on the network only while Receive from Nearby is open.

    Sent outsideOnly when you send, to the other device on your Wi-Fi

  • Pro purchase

    Apple or Google handles the purchase; the app only records on your device whether you have Pro.

    Sent outsideTo the App Store / Google Play when buying or restoring

2. What we collect

Nothing. The app has no accounts, and contains no analytics or advertising SDK.

3. Device features the app uses

  • Camera: to scan documents and to photograph a real stamp or signature. Photos are processed on your device only.
  • Photos: to import images for PDFs or stamps, and to save PDF pages as images.
  • Face ID / Touch ID / biometrics: to unlock the app when App Lock is on. The operating system handles authentication; the app never receives biometric data.
  • Local network: to find devices on the same Wi-Fi and exchange PDFs directly with them, with Send to Nearby Device and Receive from Nearby.

Your device asks for permission the first time each feature is used. If you say no, everything else still works.

4. Network use

The app only goes online to buy PDF Hanko Pro, restore a purchase or check your purchase status. Apple (App Store) or Google (Google Play) handles this; we never receive your payment details.

Send to Nearby Device and Receive from Nearby connect two devices directly over the same Wi-Fi (your local network). Files never pass through our servers or anyone else's, and are not sent over the internet. The connection is encrypted between the two devices (P-256 ECDH and AES-256-GCM), and both screens show the same confirmation code. A device's display name is visible to others on the network only while Receive from Nearby is open on it, and nothing arrives until the receiver chooses Receive.

If you have allowed your device to share analytics, technical details of an app crash may reach us through Apple or Google. These reports never contain your documents.

5. Storage and deletion

Documents, stamps, signatures and your profile are stored only in the app's storage on your device. Deleting the app deletes them. We keep no backup, so deleted data cannot be recovered.

With "Delete temporary files automatically" on, files made for sharing or exporting are removed when the app goes to the background and when it starts.

6. Protecting your data (encryption)

The app's storage is protected by your operating system's encryption, tied to your passcode or screen lock (Data Protection on iOS, file-based encryption on Android). On iPhone and iPad the app uses a protection class that makes its data unreadable while the device is locked.

Encrypt PDF (PDF Hanko Pro) encrypts a PDF with AES-256 and sets a password to open it and permissions for printing, copying and editing. Encryption happens on your device; the password is neither stored by the app nor sent to us. If you forget it, we cannot open that PDF either.

7. Sharing with third parties

We don't receive your information, so we can't share it. Files you share yourself are handled under the policy of the service you share them with.

8. Children

The app collects no personal information from anyone, whatever their age.

9. Changes to this policy

Any change will be published on our website and in the app with a new "last updated" date.

10. Contact

Questions about this policy: support@z-cloud.com.vn.

Effective: September 28, 2026
Z-SOFT CO., LTD