PDF Watermark Adder
Apply custom text watermarks to all pages of a PDF document with full control over rotation, opacity, font size, and color without uploading files.
How to Use PDF Watermark Adder
1
Select your PDF document.
2
Enter your watermark text (e.g. 'CONFIDENTIAL', 'DRAFT', 'DO NOT COPY').
3
Adjust the font size, opacity, and angle sliders.
4
Choose a color (gray, red, blue, or black) and click 'Download Watermarked PDF'.
What This Tool Does
Loads the PDF binary into memory using pdf-lib, embeds standard Helvetica vector fonts, and paints rotated text overlays on every page canvas.
Common Use Cases
Marking sensitive business proposals, agreements, and NDAs as confidential.
Protecting sample chapters, previews, and proofs with draft stamps.
Branding company documents before client distribution.
Privacy & Local-First Processing
Your documents never leave your computer. Processing happens 100% in local browser memory.
Frequently Asked Questions
Can the watermark be easily removed?
The text watermark is baked directly into the PDF page drawing tree as an overlay element.