HOW IT WORKS
Watermark PDF in three steps
- Choose one PDF.
- Enter basic Latin text and opacity.
- Process and verify the new PDF.
ON-DEVICE PROCESSING
Add a text watermark to a PDF
Enter watermark text and opacity. VietPDF places it diagonally across each page without changing the original.
LOCAL WORKSPACE
Choose a PDF to watermark
Add translucent diagonal text to every page.
No documents selected
PRACTICAL GUIDE
What to know before you watermark pdf
A text watermark places a visible label such as DRAFT or INTERNAL on every page. It is a visual signal, not DRM, and it does not prevent someone with suitable software from editing the document.
Draft copies
Mark a document awaiting approval so it is less likely to be mistaken for a final release.
Internal classification
Place INTERNAL or SAMPLE on a copy shared within a team.
Demonstration material
Label a sample used for presentations or training.
HOW THE PDF CHANGES
Technical limits to understand
Supported characters
The current engine uses a basic Latin PDF font. Accented Unicode text requires a properly licensed embedded font and is not supported yet.
Fixed placement
Text is placed diagonally near the center at a fixed size. Very small or dense pages need manual review.
Not copy protection
The watermark is drawn into a new PDF but does not encrypt the file, disable printing or control access.
TROUBLESHOOTING
If the result is not what you expected
Why is accented text rejected?
The standard font does not contain all Unicode glyphs. Use basic Latin characters in this release.
Can a watermark be removed?
It may be removed with specialist PDF editing software. A watermark is a visual notice, not absolute protection.
FAQ
Frequently asked questions
Can a watermark be removed?
It is drawn into the new page content, but it should not be treated as absolute copy protection.
Does it support accented Unicode text?
Not yet. A properly licensed embedded Unicode font is required.
Can I use a logo?
The current version supports text only.