Stamp text across every page — diagonal, tiled or centred, with the opacity, size and colour you choose. Entirely in your browser, with no upload.
A watermark answers a question the reader would otherwise get wrong: is this final? is this shareable? A single diagonal DRAFT or CONFIDENTIAL costs nothing and prevents the kind of mistake that ends up in a meeting.
Diagonal is the classic: one large mark corner to corner, hard to crop out and easy to read. Tiled repeats the mark in a grid, which is the right choice when pages might be photographed or partially copied. Top or bottom keeps the body text completely clear — best for documents that will actually be read closely.
Opacity is the whole game. Above about 25% the mark starts competing with body text, especially on data tables. Pair a low opacity with a large size instead: a 100 pt mark at 12% reads clearly as a label while leaving every line legible.
Stamping page numbers or Bates numbers at the same time? Page numbering is in the same editor. To label only part of a document, use Split PDF and Merge PDF.
Open your PDF, expand the Watermark panel on the right, tick “Add a watermark on export”, then set the text, layout, size, opacity and colour. It is applied to every page when you download.
The editor stamps every page. To watermark a subset, split the document first, watermark the part you need, and merge it back — both tools are here and both are lossless.
10–20% is right for a background mark that does not fight the text. Go higher only when the watermark must be impossible to miss, such as DRAFT on a document that must never be mistaken for final.
It is drawn into the page content, so it cannot be toggled off in a viewer — but anyone determined can edit it out, exactly as with any other PDF watermark. Treat it as a clear label, not as a security control.
No. This watermark control writes text in a chosen colour, size, opacity and layout; it does not accept an image. Add the logo with the PDF editor instead if you need a graphic on the page.