Add a diagonal text watermark (e.g. CONFIDENTIAL, DRAFT) to every page of your PDF.
Document owners marking drafts, confidential reports, or branded PDFs before sharing.
Upload your PDF
Add the PDF you want to watermark.
Customise the watermark
Enter your text and choose the colour (grey, red, blue, green), font size, and opacity.
Download the watermarked PDF
Click Add Watermark and download the marked copy.
A watermark across a PDF removes any ambiguity about its status and discourages misuse. Stamping DRAFT stops an early version being mistaken for the signed final; CONFIDENTIAL signals that a proposal should not be forwarded; and a studio name or copyright notice marks creative work as yours before it reaches a client. Doing this by hand in an editor, page by page, is tedious — especially on long documents. This tool adds your chosen text diagonally across every page in one step. Upload the PDF, set the watermark text, colour, font size, and opacity, and download the marked copy. It is built with pdf-lib and runs entirely in your browser, so sensitive documents are never uploaded. The watermark is embedded into each page’s content rather than added as a removable layer, so it cannot simply be deleted in a standard PDF reader.
Legal & compliance
Stamp drafts as DRAFT so they can’t be confused with final, signed versions.
Sharing proposals
Mark proposals and quotes CONFIDENTIAL before sending to discourage redistribution.
Photographers & designers
Brand portfolio PDFs with your name or copyright before showing clients.
Samples & previews
Add SAMPLE or PREVIEW to documents you share before payment or sign-off.
Internal documents
Label files INTERNAL or the version/status so their handling is unambiguous.
It is embedded into the page content, so it cannot be removed with standard PDF readers — unlike a simple annotation layer.
It is applied diagonally across the centre of each page; custom positioning is not currently supported.
No. Watermarking runs entirely in your browser with pdf-lib, so your file never leaves your device.
Yes — adjust the opacity and font size for a faint background mark or a bold, prominent stamp.
Currently the watermark is applied to every page at once.
The tool applies text watermarks; for a logo, add it to your text-based mark or use a dedicated image overlay workflow.
No. It produces a new watermarked copy and leaves your original untouched.
Yes — watermark as many PDFs as you like for free, with no account and no UtilKit branding added to your file.