Can I add an image watermark like a logo?

This tool supports text watermarks only. For logo or image watermarks, you would need to use PDF editing software such as Adobe Acrobat.

Can the watermark be removed?

Text watermarks added to PDFs can be removed by someone with PDF editing software. For stronger protection, use a low-contrast diagonal watermark at a higher opacity.

Does it work with password-protected PDFs?

No. Encrypted PDFs must have the password removed before a watermark can be applied.

Is my PDF uploaded to a server?

No. All processing happens entirely in your browser using pdf-lib. Your PDF never leaves your device.

Will the watermark affect the file size?

Text watermarks add a very small amount of data to the PDF. The file size increase is typically negligible.

Images Tool Box

Utilities

PDF Watermark Tool Online Free

Add a customizable text watermark to any PDF document. Choose your watermark text, color, opacity, font size, and position — centered, diagonal, or in any corner. Apply to all pages or just the first. Download the watermarked PDF instantly. All processing runs in your browser.