Stamp a text watermark or page numbers on any PDF — pick font size, opacity, rotation, colour and placement, compare the output size, and download.
All processing happens locally in your browser. Your PDF never leaves your device.
Drop a PDF here or click to browse — one PDF at a time
Opacity is baked in by blending the chosen colour toward white, which assumes white page backgrounds — light colours on white pages can be nearly invisible.
Everything here is done with the open-source pdf-lib library running entirely in your browser. There is no upload step — the file never leaves your device.
channel = colour × opacity + 255 × (1 − opacity). A grey #999999 at 15% becomes a very light grey that looks exactly like a translucent stamp on white paper. On dark page backgrounds the blend assumption breaks — the mark shows brighter than intended.{n} is replaced with the current page number plus your start offset, and {N} with the document's total page count — giving 'Page 3 of 12' style footers for court filings and exam papers.A watermark deters casual misuse and signals that a document is confidential or a draft — it does not prevent anything. The mark is drawn as ordinary text painted on top of each page, so a determined reader can still use the content. For real protection, encrypt the PDF with a password and control access; this tool deliberately doesn't touch copy protection.
Yes, with effort. The output is a normal PDF where the watermark lives as its own text objects, so a PDF editor can select and delete them, and re-printing to PDF also strips them. What is true: the download is a static, flattened-looking file — the watermark is baked into the page layout, so anyone printing or viewing it sees the mark; there is no toggle to hide it in a plain viewer.
pdf-lib's text drawing has no alpha channel, so we simulate transparency by pre-mixing your colour with white: each channel becomes colour×opacity + 255×(1−opacity). That looks exactly like true transparency on white paper — but only on white. Very light colours or high opacity limits keep the blend predictable; a pale yellow at 10% would simply vanish, so the slider range keeps results visible.
Yes — switch to Page numbers mode and use the {n}/{N} template (e.g. 'Page {n} of {N}', '{n} / {N}', or just '{n}'), pick bottom-center, bottom-right or top-right placement, and set a start offset when the first sheet is a cover page. Court filings, exam papers and exhibit bundles are exactly what this mode was built for.
No. Your PDF is parsed, stamped and saved entirely in your browser with pdf-lib. There is no upload step, no account, and no network request that contains your file.
If you just finished with PDF Watermark, the natural next steps are PDF Rotator, PDF Page Count, PDF Page Numbers, or browse every tool in Privacy File Tools.