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Opacity
30%
Font size
72 pt
#808080
Rotation angle
45°
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Add Watermark to PDF — Free Online Tool
Stamp DRAFT, CONFIDENTIAL or any custom text diagonally across every page of your PDF. Control opacity, size, color and angle — then download.
Pages watermarked–
Text–
Angle / opacity–
Drop a PDF above, set your watermark text and style, then press Add watermark.
Watermark on every page
No sign-up needed
Free forever
How it works
1Drop a PDF and type the watermark text — DRAFT, CONFIDENTIAL, or anything.
2Tune the style — opacity, font size, color and rotation angle (45° diagonal by default).
3Download the watermarked PDF. The text sits behind your content is not guaranteed.
Frequently asked questions
Does the watermark sit behind the page content?
No — the watermark is drawn on top of the page content with transparency. It stays readable over text while letting the content show through, which is how most watermarks work.
Can the watermark be removed from the downloaded PDF?
A determined person with a PDF editor could remove it, as with any watermark. It is a visual mark, not copy-protection or encryption.
Is my PDF uploaded anywhere?
No. Watermarking happens entirely in your browser with the pdf-lib library — your PDF never leaves this page.
Text watermarking via pdf-lib · 100% local — your PDF never leaves this page.