Can I add a watermark to a PDF for free?

Yes. iLovePDF, PDF24, and Smallpdf all add text or image watermarks to PDFs at no cost, with no sign-up required. For bulk files or offline use, PDF24's desktop app is also free. Adobe Acrobat Standard and Pro support watermarking but require a paid subscription.

How do I add a diagonal watermark to a PDF?

In iLovePDF or PDF24, set the rotation field to 45 degrees (or -45 for the opposite diagonal). For text watermarks, increase the font size to 60–80pt so the text spans the page. Most tools default to diagonal placement for "CONFIDENTIAL" and "DRAFT" stamps.

What image format works best for a logo watermark?

Use a PNG file with a transparent background. A transparent PNG lets the watermark float over the existing content without a white or colored box around it. JPEG files work but always produce a rectangular opaque block, which obscures the document underneath.

Can I add a watermark to only specific pages?

Yes. Tools like iLovePDF, Sejda, and Adobe Acrobat let you define a page range — for example, pages 1–3 only, or every other page. PDF24 applies the watermark to all pages by default, but you can pre-split the document, watermark the relevant portion, then merge it back.

Are PDF watermarks permanent?

Not always. A watermark added as a separate content layer can be removed with tools like Adobe Acrobat, PDF editors, or even Ghostscript. To make a watermark harder to remove, flatten the PDF after watermarking — this merges the watermark into the page content as a single static layer. See our guide to [flattening a PDF](/blog/flatten-pdf/) for the steps.

Add a Watermark to PDF (Text or Logo)

Adding a watermark to a PDF takes under two minutes with free online tools — no Acrobat subscription required. This guide covers text watermarks, logo watermarks, opacity settings, and every free method for Mac, Windows, and browser.

Frequently Asked Questions

Can I add a watermark to a PDF for free?: Yes. iLovePDF, PDF24, and Smallpdf all add text or image watermarks to PDFs at no cost, with no sign-up required. For bulk files or offline use, PDF24's desktop app is also free. Adobe Acrobat Standard and Pro support watermarking but require a paid subscription.
How do I add a diagonal watermark to a PDF?: In iLovePDF or PDF24, set the rotation field to 45 degrees (or -45 for the opposite diagonal). For text watermarks, increase the font size to 60–80pt so the text spans the page. Most tools default to diagonal placement for "CONFIDENTIAL" and "DRAFT" stamps.
What image format works best for a logo watermark?: Use a PNG file with a transparent background. A transparent PNG lets the watermark float over the existing content without a white or colored box around it. JPEG files work but always produce a rectangular opaque block, which obscures the document underneath.
Can I add a watermark to only specific pages?: Yes. Tools like iLovePDF, Sejda, and Adobe Acrobat let you define a page range — for example, pages 1–3 only, or every other page. PDF24 applies the watermark to all pages by default, but you can pre-split the document, watermark the relevant portion, then merge it back.
Are PDF watermarks permanent?: Not always. A watermark added as a separate content layer can be removed with tools like Adobe Acrobat, PDF editors, or even Ghostscript. To make a watermark harder to remove, flatten the PDF after watermarking — this merges the watermark into the page content as a single static layer. See our guide to [flattening a PDF](/blog/flatten-pdf/) for the steps.