Add Watermark
Stamp a diagonal text watermark across every page of a PDF — set the text, color, size, and rotation. Runs entirely in your browser.
Drop a file here or click to upload
Drop a PDF to preview the watermark
Your Data Never Leaves Your Device
Every tool runs entirely in your browser. Nothing you type is uploaded, stored, or logged on our servers.
The Add Watermark tool stamps a diagonal text watermark — like CONFIDENTIAL, DRAFT, or a custom label — across the center of every page in a PDF. Adjust the text, color, font size, rotation, and opacity, and preview the result on the first page before saving.
The watermark is drawn directly into the PDF with pdf-lib, entirely in your browser — nothing is uploaded.
FAQ
Yes — type anything into the watermark text field, such as CONFIDENTIAL, DRAFT, SAMPLE, or a company name.
The watermark is always centered on the page and drawn diagonally; you control its size, rotation angle, color, and opacity.
Yes — the same watermark is stamped on every page of the PDF.
No. The watermark is drawn directly into the PDF with pdf-lib, entirely in your browser.
Yes — lower the opacity slider for a faint, unobtrusive watermark, or raise it for a more prominent stamp.