01 / GUIDE
How to use Add a PDF watermark
- Choose a PDF and enter the exact watermark text.
- Set size and opacity, and choose whether to apply it to all pages.
- Preview the sample and save a new marked PDF.
02 / DETAILS
About this conversion
Place a readable, translucent text mark on each page and download a separate copy of the document.
Watermarks are useful for identifying a draft or copy. They are not a security control: a recipient may still remove or cover a mark with other software.
Limits to know
Files are processed in this browser session. Each input is limited to 40 MiB and 120 pages; password-protected, damaged, or unusual PDFs may not open.
Processing runs in this browser. Originals are not overwritten, and the output size is measured in bytes before download. Keep a backup of important files.
03 / FAQ
Questions people ask
Does a watermark prevent copying?
No. It visually labels pages but does not encrypt or lock the document.
Is the original PDF overwritten?
No. The watermark is added to a newly generated output file.
04 / EXPLORE