---
title: "Add watermark to PDF on iOS | Nutrient SDK"
canonical_url: "https://www.nutrient.io/guides/ios/editor/watermark/"
md_url: "https://www.nutrient.io/guides/ios/editor/watermark.md"
last_updated: "2026-05-14T21:57:26.896Z"
description: "Add watermark to PDF on iOS | guide for Nutrient iOS SDK with detailed instructions and code examples."
---

# Adding watermarks to PDFs on iOS

Nutrient enables you to draw a permanent watermark on all pages of a document. The example below shows how to generate a PDF with a watermark on all its pages using the [`Processor`](https://www.nutrient.io/api/ios/documentation/pspdfkit/processor) API:

```swift

// Create a default configuration.
let configuration = Processor.Configuration(document: document)!

configuration.drawOnAllCurrentPages { context, pageIndex, pageRect, renderOptions in
    // Careful. This code is executed on background threads. Only use thread-safe drawing methods.
    let text = "PSPDF Live Watermark On Page \(pageIndex + 1)"
    let stringDrawingContext = NSStringDrawingContext()
    stringDrawingContext.minimumScaleFactor = 0.1

    // Add text over the diagonal of the page.
    context.translateBy(x: 0, y: pageRect.size.height / 2)
    context.rotate(by: -.pi / 4)
    let attributes: [NSAttributedString.Key: Any] = [.font: UIFont.boldSystemFont(ofSize: 30),.foregroundColor: UIColor.red.withAlphaComponent(0.5)
    ]
    text.draw(with: pageRect, options:.usesLineFragmentOrigin, attributes: attributes, context: stringDrawingContext)
}

// Start the conversion from `document` to `processedDocumentURL`.
let processor = Processor(configuration: configuration, securityOptions: documentSecurityOptions)
try processor.write(toFileURL: processedDocumentURL)

```

The method above will write a new document to the URL pointed to by the `processedDocumentURL` argument. The resulting PDF file will have a permanent watermark on all of its pages, even when opened in other PDF editors.

### Adding a temporary watermark

You can also add a temporary watermark as a rendering on the document pages without generating a new PDF. This temporary watermark isn’t a part of the document, and it won’t be saved to disk even if you call the document's save method. Here's how to add a temporary watermark:

```swift

let renderBlock: PSPDFRenderDrawBlock =  { context, pageIndex, pageRect, renderOptions in
    // Careful. This code is executed on background threads. Only use thread-safe drawing methods.
    let text = "PSPDF Live Watermark On Page \(pageIndex + 1)"
    let stringDrawingContext = NSStringDrawingContext()
    stringDrawingContext.minimumScaleFactor = 0.1

    // Add text over the diagonal of the page.
    context.translateBy(x: 0, y: pageRect.size.height / 2)
    context.rotate(by: -.pi / 4)
    let attributes: [NSAttributedString.Key: Any] = [.font: UIFont.boldSystemFont(ofSize: 30),.foregroundColor: UIColor.red.withAlphaComponent(0.5)
    ]
    text.draw(with: pageRect, options:.usesLineFragmentOrigin, attributes: attributes, context: stringDrawingContext)
}

document.updateRenderOptions(for:.page) {
    $0.drawBlock = renderBlock
}

```

For more details, see [`DrawOnPagesExample.swift`](https://github.com/PSPDFKit/pspdfkit-ios-catalog/blob/master/Catalog/Examples/DocumentProcessing/DrawOnPagesExample.swift) from [Nutrient Catalog](https://www.nutrient.io/guides/ios/getting-started/example-projects.md#nutrient-catalog).
---

## Related pages

- [Add pages to PDF files on iOS](/guides/ios/editor/add-page.md)
- [How to attach files to PDFs on iOS](/guides/ios/editor/attach-a-file.md)
- [Add and insert images into PDFs on iOS](/guides/ios/editor/add-image.md)
- [Customizing PDF editing permissions on iOS](/guides/ios/editor/document-permissions.md)
- [Merge multiple PDF files on iOS](/guides/ios/editor/merge-or-combine.md)
- [iOS PDF editor API usage](/guides/ios/features/document-editor.md)
- [Edit text in PDFs on iOS](/guides/ios/editor/edit-text.md)
- [PDF editor library for iOS](/guides/ios/features/document-processing.md)
- [Split PDFs on iOS](/guides/ios/editor/split.md)