ToolBoxWatermark PDF
Add a diagonal text watermark to every page.
Free · No signup · Files stay on your device
or drop a file here
How to use Watermark PDF
- 1Click the Select button and choose your file, or drag and drop.
- 2Fill in the options shown on the page.
- 3Press the Watermark PDF button.
- 4Download your result.
Your files stay private
Your file is processed on your own device. It is never uploaded to our servers.
Frequently asked questions
Is Watermark PDF free?
Yes. ToolBox is 100% free. No signup, no watermark, no daily limit.
Are my files uploaded to a server?
No. All work happens inside your browser on your own device. Your files never leave your phone or computer.
Does it work on mobile?
Yes, on Android, iPhone, tablets and desktop. Very large files can be slow on older phones.
What are the limits of Watermark PDF?
Only English letters, numbers and common symbols are supported in the watermark text.