Free during beta

Add Watermark to PDF Online — Free Tool

Add custom watermarks to PDF pages. Protect your documents with visible text overlays — all processing happens locally in your browser.

⚡ Instant — Add watermarks in seconds

🔒 Private — Files stay on your device

🆓 Free — Unlimited watermarks during beta

Open Tool →

Why Choose Our PDF Watermark Tool?

Complete Privacy

Your PDF never leaves your device. Cloud watermark tools upload documents to servers. LocalPDF applies watermarks locally using client-side rendering.

Customizable Appearance

Control watermark text, position, opacity, rotation, and size. Create subtle background marks or prominent overlays.

No Watermark on Watermarks

Ironic but true — some free tools add their own branding when you watermark PDFs. LocalPDF never adds our logo or URL to your files.

Instant Processing

No upload delays. Watermarks render in your browser at native speed, typically under 3 seconds even for multi-page documents.

Preserve Original Quality

Watermarks are added as overlay layers without re-encoding the entire PDF. Original page quality and structure remain intact.

Batch Watermarking

Apply the same watermark to multiple PDFs sequentially without re-uploading or reconfiguring settings.

How It Works

Click "Open Tool" button above
Upload the PDF you want to watermark
Enter watermark text
Customize position, opacity, and rotation
Preview and download watermarked PDF

100% Private: Your files never leave your device. All processing happens locally in your browser.