Free PDF Watermark Tool
Add text or image watermarks to PDF files securely in your browser. No uploads, 100% private.
Watermark Settings
Drag & drop your PDF here or click to browse
Files are processed locally in your browser
Upload PNG/JPG image for watermark
Preview & Download
Upload a PDF to see preview
Tip: For best results, use low opacity (0.06-0.18) and 30°-45° rotation. PNG images with transparency work best.
Why Use Our PDF Watermark Tool?
100% Secure & Private
All processing happens in your browser. No file uploads, no server storage, complete privacy guaranteed.
Fast & Efficient
Add watermarks to PDFs instantly. No waiting for server processing or file transfers.
Advanced Options
Multiple placement modes, custom text, image watermarks, rotation, opacity control, and more.
Free & Unlimited
No registration required. Watermark unlimited PDF files completely free, no restrictions.
Frequently Asked Questions
Absolutely! Our tool processes all files locally in your browser using JavaScript. No files are ever uploaded to any server. Your PDF never leaves your computer.
The tool can handle large PDF files, but performance depends on your browser and device memory. For best results, use PDFs under 100MB. Image watermarks should be under 5MB.
Currently, we use standard PDF fonts (Helvetica, Times Roman, Courier). For custom fonts, you would need to upload the font file, which we plan to add in a future update.
We support PNG, JPG, and JPEG formats. PNG with transparency works best for watermark overlays. SVG support is planned for future updates.
No, the original PDF quality is preserved. Watermarks are added as a separate layer and don't affect the original content quality or text searchability.