Add Watermark

Stamp Text Across Every Page of a PDF

Type a word or phrase, choose where it sits and how faint it is, and the tool draws it onto every page of the document. DRAFT, CONFIDENTIAL, a client name, a date or a case reference: anything that needs to be visible on the paper without being part of the content.

Five settings, one stamp

Text. One line, Latin characters. That's the whole input.

Position. Centre, or any of the four corners. Corner stamps sit a proper distance in from the page edge, so they don't collide with the trim or disappear when you print.

Opacity. 5% to 80%. This is the setting that decides whether the result looks professional or ruins the page.

Size. 12 pt to 96 pt. A 96 pt word spans most of an A4 page width, while 12 pt is footnote-sized and suits a corner reference.

Angle. −90° to +90°. Zero is horizontal. Around 45° gives the diagonal look people picture when they hear "watermark", and it works because a diagonal line crosses more of the page than a horizontal one at the same font size.

Picking an opacity that works

Most bad watermarks are too dark. The text underneath has to stay comfortable to read, and a stamp at 50% opacity fights it.

• 8-15%: a large diagonal on a white text page. Clearly visible, still easy to read through. Start here.
• 20-30%: a small corner mark, or a page with a lot of white space.
• 40%+: deliberately obstructive. Use it when you want a preview copy to be awkward to use, and accept that it'll look heavy.

Print a test page before you do a hundred-page document. Screens are backlit and paper isn't, so a stamp that looks right at 10% on a monitor often prints paler than you'd expect.

What this does not do

Text only. There's no image or logo upload. If you need a company mark instead of a word, this tool can't help; a desktop editor or an export from the source application can.

Every page, no exceptions. You can't choose pages. To stamp only part of a document, split it with Extract Pages, watermark the extract, and reassemble with Merge PDF.

One stamp per page. There's no tiling or repeating grid across the sheet.

If you type non-Latin text, the tool refuses it at the start and tells you why, so you don't end up with a page of empty boxes.

A watermark is a label, not a lock

The stamp is drawn into the page content, so nobody can toggle it off in a reader, and it survives printing, screenshots and most conversions. That makes it good at its actual job: showing a document's status at a glance, and making a leaked copy traceable to whoever it was issued to.

It won't protect the file, though. Anyone with a PDF editor can cover it, crop it, or rebuild the page without it. There's also no undo here. Once you download the stamped file, the mark is part of the pages, so keep the clean original.

If you want to stop the wrong person reading the document at all, you need encryption, and Protect PDF does that. A watermark and a password deal with different problems, and using one where you needed the other is a common and expensive mistake.

Files up to 100 MB, processed in the tab. Encrypted PDFs are refused at upload, so decrypt them with Unlock PDF first.