What this tool does
Identify working copies with a visible mark. The mark is added to the content and can be removed by other editors.
When to use it
Use Add PDF watermark when you need the specific operation described here and can check the result against your own source. Keep the original and work on a copy.
Steps
- Load the PDF and select pages.
- Enter text or load PNG/JPEG; adjust opacity, size and rotation.
- Review the sample before downloading and opening the PDF.
Worked example
Input: Text DRAFT, opacity 0.3, page 1.
Expected result: The watermark appears only on the first page.
Common mistakes
- PDF 5 MiB/50 pages; PNG/JPEG mark 5 MiB/8 MP; output 20 MiB.
- An image replaces the text. Text supports 1–100 compatible Latin characters. This does not prevent copying or guarantee resistance to removal.
If an error appears, reduce the input or correct the specified field. Do not treat an unsuccessful operation as a valid result. Repeat the example with synthetic data to separate an input problem from a tool problem.
Limitations and privacy
Inputs are processed in your browser. Visiting the site downloads its resources, but the tool does not upload the document or text. Results are not automatically stored. Check downloaded files before using them in a workflow.
Editing a PDF may invalidate digital signatures and does not sanitize its active content. This guide does not promise preservation of every form, attachment or advanced document feature.
Frequently asked questions
Does this change the original?
No. Keep the source and explicitly download or copy the result you want to retain.
What should I check before using the output?
The watermark appears only on the first page. PDF 5 MiB/50 pages; PNG/JPEG mark 5 MiB/8 MP; output 20 MiB.