Watermark
Stamp text or an image over your PDF pages.
How to use Watermark
Stamp text or an image over your pages — for “CONFIDENTIAL”, “DRAFT”, logos and more.
- Select a PDF.
- Choose Text or Image and set the content.
- Pick layout (center, tiled, top, bottom), rotation and transparency.
- Press Add watermark.
Options explained
- Tiled (mosaic)
- Repeats the watermark across the whole page — harder to crop out.
- Transparency
- Lower values make the watermark lighter so the content stays readable.
Tips for best results
- A transparent PNG logo gives the cleanest image watermark.
Questions
Can the watermark be removed?
A watermark is part of the page content; it can be removed with editing software. For stronger protection, flatten pages (Grayscale PDF) after watermarking.
Is Osd-Scan really free?
Yes. Every web tool is free with no sign-up, no watermark and no daily limit. The website is supported by ads. A paid desktop app for Windows (one-time purchase, no ads) is coming soon.
Are my files uploaded to a server?
No. All processing happens inside your browser on your own device. Your documents never leave your computer or phone, so nobody — including us — can see them. You can even disconnect from the internet after the page loads.
Which browsers are supported?
Current versions of Chrome, Edge, Firefox, Safari and Samsung Internet on Windows, macOS, Linux, Android and iPhone/iPad. For the camera scanner on a phone the page must be opened over https.