CornerTools

Watermark PDF

Stamp text or an image on PDF pages, with opacity, angle and position, over or behind the content.

Drop PDFs here, or

Your files never leave your device

Processed in this browser · up to 50 at a time

30%
45°
Layout
Position
Layer

Marks the pages of a PDF with a word or an image: DRAFT on a document still under review, CONFIDENTIAL on one shared outside, a company logo, or a name across a copy of an ID sent for one purpose (“For bank KYC only”). The mark is added as its own layer; the page itself is not drawn again, so its text stays sharp and selectable and links and form fields keep working. The PDF is watermarked on your device and never uploaded.

How to use it

Add one or more PDFs, then choose the watermark:

  • Text: one line, in Noto Sans, 60 pt by default (8–300), in the colour you choose. English and Hindi can be mixed on one line with accents and symbols such as ₹ and ©; Hindi is shaped, so conjuncts such as क्ष and vowel signs such as ि join as they should.
  • Image: a logo or signature image, as wide as a share of the page (40% by default). A PNG keeps its transparency.
  • Opacity (30% by default) and Angle (45°, turned anticlockwise).
  • Once, at one of nine positions, or Tiled across the whole page.
  • Over content or Behind content, and the Pages to mark (empty for all).

Positions are taken as each page is shown, so a page turned sideways in the PDF gets its mark the right way up. The result is named as in contract-watermarked.pdf.

Frequently asked questions

No. It shows where a copy came from or what it is for, but anyone with a PDF editor can remove an added layer, and the text under it can still be selected and copied. To stop a PDF being opened, add a password with Protect PDF.
Behind content keeps text and drawings fully readable, as the mark shows only through the blank paper. A scanned page is one picture covering the whole page, so a mark behind it cannot be seen: choose Over content for scans, at a low opacity. The result says when a page hides a watermark placed behind it.
No. Your browser reads, watermarks and saves the files on your device; they are not sent to CornerTools or anyone else, and neither is a password you type. To check, open the browser's developer tools at the Network tab and add a PDF: no request carries it. The PDF engine downloads from this site the first time you use it: a download to your browser, not an upload of your file.

See also