Add watermark to PDF
Stamp text or an image over your PDF.
Processed on your device
- 1Choose the files
- 2Arrange and adjust
- 3Download
You need to sign in to use the tools. It's free.
8 free uses a month · Plus is unlimited
Stamp a text or an image over the pages of your PDF to mark it as a draft, confidential or with your logo. Adjust the size, opacity and position, centered or tiled across the page.
How to add a watermark to a PDF in 3 steps
Open the PDF you want to mark.
Write the text or choose an image, and adjust size, opacity and position.
Apply the watermark and download the PDF.
Why use catScan
Private by design
This tool works inside your browser: the file is processed on your device and is never uploaded or stored.
Free to start
Sign in with Google and get 8 free uses per period, shared with the catScan app. 1 use = 1 downloaded file; if something fails, it doesn't count.
Nothing to install
It works in any modern browser on computer, tablet or phone. To scan paper with your camera, use the Android app.
Frequently asked questions
Can I use my logo as a watermark?
Yes. Choose an image (for example a PNG with transparency) instead of text, and adjust its size and opacity so the content remains readable.
Can I rotate the watermark?
Yes. Place it horizontally, at 45° or at 90°, centered on each page or tiled across the whole page, in the color you choose.
Are my files stored?
No. This tool processes the file on your device, inside the browser: it is not uploaded to any server and nothing is stored.
Is it free?
Yes. Sign in with your Google account and you get 8 uses per period on the free plan (1 use = 1 downloaded file; if something fails, it doesn't count). catScan Plus, bought in the Android app, is unlimited on the web and in the app.
Does it work on my phone?
Yes. It works in any modern browser on Android, iPhone, Windows, Mac or Linux, with nothing to install. The catScan Android app also lets you scan documents with the camera.