---
title: "Android PDF SDK security: Secure documents on Android | Nutrientt"
canonical_url: "https://www.nutrient.io/guides/android/document-security/"
md_url: "https://www.nutrient.io/guides/android/document-security.md"
last_updated: "2026-06-09T10:25:14.336Z"
description: "Unlock the secrets of top-notch document security on Android! Explore expert tips and best practices for safeguarding your files. Click now!"
---

# Document security on Android

Protect the content of PDF documents from editing, copying, and unauthorized distribution with Nutrient Android SDK. It offers developers a way to encrypt or decrypt PDFs, add a password, insert a dynamic watermark, and more.

## Key capabilities

- **AES-256 encryption** — Transparently decrypt data in the client

- **Data security** — Unencrypted data isn’t written to disk

- **Dynamic watermarks** — Add user identifiers to the PDF

- **Disable PDF export** — Remove the download button

- **Set and enforce permissions** — Disable printing and copying

- **Password protected** — Programmatically unlock PDF documents

- **Extendable** — Add digital signatures, redaction, and more

## Guides for document security

**[Introduction to encryption](https://www.nutrient.io/guides/android/security/introduction-to-encryption.md)**\
Learn about the basics of PDF encryption

**[Add a password](https://www.nutrient.io/guides/android/document-security/add-a-password.md)**\
How to add password-protection to a PDF document

**[Encrypt with AES](https://www.nutrient.io/guides/android/security/aesdataprovider.md)**\
How to encrypt PDF documents with AES encryption

**[Decrypt AES files](https://www.nutrient.io/guides/android/document-security/decrypt-aes-files.md)**\
How to programmatically decrypt AES-256 encrypted PDFs in-memory

**[Prevent sharing](https://www.nutrient.io/guides/android/document-security/prevent-sharing.md)**\
How to exclude the bar button items that allow sharing

**[Set permissions](https://www.nutrient.io/guides/android/features/document-permissions.md)**\
How to set permissions for printing, copying, editing, and more

**[Add a watermark](https://www.nutrient.io/guides/android/document-security/add-a-watermark.md)**\
How to add non-removable dynamic watermarks to PDF documents

**Call to Action**

Start your free trial for unlimited access and expert support.

[Learn More](https://www.nutrient.io/sdk/android/getting-started.md)
---

## Related pages

- [Encrypt PDFs with AES on Android](/guides/android/security/aesdataprovider.md)
- [Creating password-protected PDFs on Android](/guides/android/document-security/add-a-password.md)
- [Decrypt PDFs with AES on Android](/guides/android/document-security/decrypt-aes-files.md)
- [Secure your PDFs with custom watermarks on Android](/guides/android/document-security/add-a-watermark.md)
- [Introduction to PDF encryption on Android](/guides/android/security/introduction-to-encryption.md)
- [Prevent sharing of PDF files on Android](/guides/android/document-security/prevent-sharing.md)
- [Manage PDF document permissions on Android](/guides/android/features/document-permissions.md)