Add Watermark to PDF — Free & Private
Add text watermarks to any PDF. Customize text, opacity, size, rotation — 100% in your browser. No upload, no signup.
Drop a PDF to add watermark
PDF files only
🔒100% Private — Your files never leave your device. All processing runs locally in your browser.
How It Works
Upload a PDF, type your watermark text, and configure opacity, size, rotation, and position. The tool loads your PDF using pdf-lib.js, then draws the watermark text on every page before saving the result.
Processing is 100% local — your PDF is never uploaded to any server. The watermark is embedded directly into the PDF structure, so it appears in all viewers and when printed.
Features
- ✓Custom text watermarks — CONFIDENTIAL, DRAFT, or any text
- ✓Adjustable opacity from 5% to 100%
- ✓Font size control from 12pt to 120pt
- ✓Rotation angle from -90° to 90°
- ✓Position presets: center, corners
- ✓Applies to all pages automatically
Frequently Asked Questions
Yes, 100% free with no limits. The tool runs entirely in your browser.