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Add a text watermark to a PDF

Put a semi-transparent text watermark across your PDF: your own wording, the opacity and diagonal angle you want.

PDFwatermarkconfidentiality

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Files (1–1)
One PDF, up to 10 MB.

Options

Watermark text Letters, digits and ordinary punctuation; the stamp font cannot carry emoji or other non-Latin characters, so those are refused rather than rewritten.
Opacity (%) 5–90 % How strong the watermark ink is. Around 30 is the usual readable-but-understated setting.
Angle (degrees) 0–90 ° 0 sits level along the page; 45 is the classic diagonal. Measured on screen: turned pages still get 45°.
Questions people ask
Does a watermark protect my document?
It advertises, it does not protect. A text watermark sits visibly over the page, so anyone reading or printing the file sees it, but it is not a security control: a person able to edit PDFs can remove or ignore it, and it does not restrict copying, screenshots or forwarding anything. Use it for review copies, drafts and confidentiality reminders.
How see-through is it?
Opacity is yours to set. 30 percent is a comfortable default (wording clearly there, page still readable); 10 percent is a whisper; 90 percent is near-solid ink and will make the page harder to read. The ink is true transparency, not a tinted box painted over your content.
What angle should I use?
The default 45° diagonal is the classic confidential stamp and survives sight-reading best. 0° sits level behind the body text; any angle from 0 to 90 works. The angle is measured on screen: a page stored sideways still gets its watermark at the angle you chose, upright on screen.
How does the wording size work?
The tool sizes the text from your pages' geometry so the wording spans a consistent share of the page without running off it, and one size is chosen for the whole document so mixed page sizes stay proportionate. You do not pick a font size; you pick wording and see it fit.
Why was my wording rejected?
The stamp font carries the standard Latin repertoire. Letters, digits and ordinary punctuation work; emoji, Chinese/Arabic and other non-Latin scripts are refused rather than silently replaced with something else. Keep the wording to 120 characters or fewer.
What happens to my files?
The upload is removed as soon as processing finishes; the watermarked PDF stays available for about 10 minutes, then it is deleted automatically.