Watermark PDF

Add one text watermark to every page of a PDF and download the updated file.

Processing

The PDF is transformed in browser memory and this workflow does not send the document to a Stocknivo conversion endpoint. The preview may load the PDF.js script from cdnjs; its worker is served by this site. These are runtime assets, not document uploads. This tool is not fully offline.

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How it works

Choose one PDF, enter a single-line watermark, then set its size, opacity, rotation, color, and one of nine fixed positions. The same watermark is applied to every page.

Limits and unsupported cases

The input may be up to 50 MiB and 200 pages; output is limited to 100 MiB. Enter one line of up to 200 code points supported by standard Helvetica/WinAnsi. Font size is 12–144 pt, opacity 10–100%, and rotation −180° to 180°. Text is applied at one of nine fixed positions on every page; images and page selection are not supported. Pages with existing rotation are rejected, and preservation of advanced PDF structures is not guaranteed.

Related tool

To add sequential labels instead, use Add Page Numbers.