---
title: "iOS PDF SDK security: Securing documents on iOS | Nutrient"
canonical_url: "https://www.nutrient.io/guides/ios/document-security/"
md_url: "https://www.nutrient.io/guides/ios/document-security.md"
last_updated: "2026-05-14T21:57:26.892Z"
description: "Unlock the power of document security on iOS with our expert guide. Discover top strategies to safeguard your files effectively. Click now!"
---

# Document security on iOS

Protect the content of PDF documents from editing, copying, and unauthorized distribution with Nutrient iOS SDK. It offers developers a way to encrypt and 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 cached or written to disk

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

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

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

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

- **Prevent sharing** — Remove bar buttons that allow sharing

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

## Guides for document security

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

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

**[Encrypt with AES](https://www.nutrient.io/guides/ios/security/encrypt-or-decrypt-files-on-the-server.md)**\
How to encrypt PDF documents with AES encryption

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

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

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

**[Add a watermark](https://www.nutrient.io/guides/ios/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/ios/getting-started.md)
---

## Related pages

- [Creating password-protected PDFs on iOS](/guides/ios/document-security/add-a-password.md)
- [Encrypt PDFs with AES on iOS](/guides/ios/security/encrypt-or-decrypt-files-on-the-server.md)
- [Decrypt PDFs with AES on iOS](/guides/ios/security/aesdataprovider.md)
- [Securing PDFs by adding watermarks on iOS](/guides/ios/document-security/add-a-watermark.md)
- [Introduction to PDF encryption on iOS](/guides/ios/security/introduction-to-encryption.md)
- [Prevent sharing of PDF files on iOS](/guides/ios/document-security/prevent-sharing.md)
- [Managing PDF restrictions on iOS](/guides/ios/document-security/set-permissions.md)