Watermark every page of a PDF

Updated 28 September 2026

To watermark a PDF, drop it here, type the text that should appear on the pages and download the stamped file. By default the text runs diagonally through the middle of every page, light and partly transparent, so the content underneath stays readable.

Anyone holding a copy can then see at a glance what it is: a sample, an internal version or a file still under review.

The stamping happens in your browser. The PDF is never uploaded and never reaches our servers, so an unreleased report can be marked without leaving your laptop.

Marking a whole folder

Drop a folder of PDFs and each file gets the same stamp. In the browser there is no batch cap and no daily allowance. Each PDF can be up to 50 MB free, or 500 MB with Pro, and your device sets the pace. Download the results singly or as one ZIP.

For a routine job, such as stamping every outgoing sample and then renaming the files, a pipeline runs the steps over the whole set. Pipelines are free to try on 3 files. Pro, at EUR 7.99 a month or EUR 59 a year, runs them on up to 500. Credits pay for a big one-off run without a subscription: one credit covers 25 files, and credits never expire.

Size, color and opacity

Out of the box the mark is gray, 60 point, 25 percent opacity and tilted 45 degrees. It is centered on each page separately, so a file that mixes portrait sheets, landscape sheets or different paper sizes still gets a centered mark on all of them.

You can change the size, the opacity and the color. Gray stays in the background. Red at a low opacity signals a warning. Short text works best: SAMPLE, INTERNAL, VOID, FOR REVIEW or a project code.

The stamp is genuine text sitting in its own layer above the page. Printed copies show it as the screen does.

How to stamp a watermark on a PDF

1. Drag a PDF, or a folder of them, onto the page.
2. Enter the text for the mark.
3. Adjust size, opacity or color if the defaults do not suit.
4. Click Add watermark and download the PDF, or the ZIP for a batch.

A label, not a lock

We add a layer and leave the original content alone. Nothing is redrawn or recompressed: text stays selectable, images keep their quality, and the file gets only slightly larger.

That layer is also the limit. It can be deleted again by someone with PDF editing software and enough determination, so treat the watermark as a notice about a document's status, not as protection. If the wrong people must not open or copy the file, add a password with Protect PDF too.