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SwiftPDF
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Watermark PDF

Add text watermarks to your PDF documents

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Drop your PDF here or click to browse

.pdf files • One file at a time

How to Watermark PDF

  1. 1

    Upload the PDF file you want to watermark.

  2. 2

    Enter your watermark text and choose style options.

  3. 3

    Click "Add Watermark & Download" to process.

  4. 4

    Your watermarked PDF downloads automatically.

FAQ

Can I customize the watermark?

Yes! You can set the text, position (center or diagonal), and opacity level.

Will the watermark be visible enough?

You can adjust the opacity slider. 30% opacity is subtle but readable — increase it for more visibility.

Is my PDF uploaded to a server?

No. All processing happens in your browser. Your file never leaves your device.