Add Watermark to PDF Local Free

Protect your PDFs with custom watermarks. All processing happens locally in your browser.

Why Use Watermarks?

Watermarks identify document status, protect intellectual property, and prevent unauthorized use. Common uses include marking documents as "DRAFT," "CONFIDENTIAL," or adding company logos for brand consistency.

Our watermark tool offers full customization of text, images, position, opacity, and more - all processed locally.

How to Add a Watermark

1. Upload PDF — Select your PDF file
2. Choose watermark type — Text or image
3. Customize appearance — Set text, font, size, opacity
4. Position watermark — Center, tiles, or custom placement
5. Apply and download — Save your watermarked PDF

Watermark Options

• Text watermarks with custom fonts
• Image watermarks (logos, stamps)
• Adjustable opacity (10-100%)
• Tile/repeat across pages
• Custom position and rotation

Watermark Type Comparison

Common Watermark Uses

Watermarks serve many purposes:

• Document status — DRAFT, CONFIDENTIAL, REVIEW
• Brand identity — Company logos on all documents
• Security — PROOF only, Do Not Copy
• Organization — Department or project names

"Added our company logo watermark to all client proposals. Made the documents look professional and protected our brand. Perfect!"

Code example for watermarking:

// Add text watermark to PDF
const pdfDoc = await PDFLib.load(fileData);
const pages = pdfDoc.getPages();
const { width, height } = pages[0].getSize();

for (const page of pages) {
  page.drawText('CONFIDENTIAL', {
    x: 50,
    y: height / 2,
    size: 50,
    opacity: 0.3,
    color: rgb(0.7, 0.7, 0.7),
    rotate: degrees(45)
  });
}

await pdfDoc.save();