Start with your files

Local document processing

Drop your PDF files here

or browse files on your device

Choose filesPDF files only · Maximum recommended 50 MB per file · Large files may use significant memory

Watermark text

Basic Latin characters are recommended. A watermark is not password protection.

Choose a file to get started.

Files are processed in your browser, not intentionally uploaded to SupUser. The app loads JavaScript libraries from external CDNs. Check every exported file before sharing.

ABOUT THIS TOOL

What is Watermark PDF?

A watermark can help communicate the status of a document, such as DRAFT or INTERNAL. This tool draws a lightly transparent diagonal text label across every page. A visible watermark is not access control and does not prevent copying or modification.

How to use Watermark PDF

Select the document to label.
Enter the text for your watermark, such as DRAFT.
Download the watermarked PDF and confirm the text is readable.

When is this useful?

Mark a shared working copy as DRAFT before collecting edits from your team.

Tips for better results

Use short text for clarity on narrow pages.
Watermarks do not encrypt documents or restrict who can open them.
Avoid adding a watermark over critical text that must remain legible.

Important: Keep your original file and review the downloaded output. Not every interactive PDF form, digital signature, annotation, or specialized PDF object is guaranteed to be preserved.

COMMON QUESTIONS

Frequently asked questions

Is a watermark a security feature?

No. It is a visual label only, not encryption or digital rights management.

Will it appear on every page?

Yes. The same watermark is applied across all pages.

Can I use accented or non-Latin text?

The built-in standard PDF font supports a limited set of characters. Basic Latin text works best.

Watermark PDF