> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://edp.crisp.help/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# What is the PDF Stamping feature?

If you are selling some PDF files, the PDF Stamping feature can add a great layer of protection to your files. This feature gives you the ability to add a line of text at the bottom of each page of your PDF files when your customers download them. This line of text can contain dynamic data, like some personal details of your customers to prevent them from sharing the files online (since they won't want their personal details to be shared at the same time). On top of the text, you can also customize its size and color through the app :

![](https://storage.crisp.chat/users/helpdesk/website/342110bbd2006000/capture-decran-2023-04-11-a-07_uz1r9m.png)


_Please note that PDF Stamping is a pro plan feature._