Watermark PDF
Add Text or Image Watermarks

No. All processing happens entirely in your browser using JavaScript. Your PDF files never leave your computer and are never uploaded to any server. This makes the tool completely private and secure.

No. The original PDF content is preserved. The watermark is added as an overlay without re-compressing or degrading existing images and text.

Upload your PDF, choose text or image watermark type, customize the settings (text, opacity, position, rotation), and click "Download" to save your watermarked PDF.

Yes! Select "Image" as the watermark type and upload your logo. PNG files with transparent backgrounds work best. You can adjust the size and opacity to get the perfect look.

You can use PNG or JPG images as watermarks. PNG is recommended because it supports transparency, which allows the watermark to blend naturally with your document content.

Watermarks are placed on top of the page content but with adjustable opacity. For a subtle "behind content" effect, use a low opacity (20-30%) so the document text remains clearly readable.

For subtle watermarks that don't obstruct content, use 20-30%. For more prominent marking, try 40-60%. Use the live preview to find what works best for your document.

For best results, use images at least 300-500 pixels wide. The tool scales your image using the slider (5-100% of page width), so higher resolution images will look sharper at larger sizes.

Yes, the watermark is applied to every page of your PDF document, positioned consistently according to your settings.

Yes, you can use most Unicode characters including accented letters, symbols, and copyright marks. However, some very rare characters may not render if they're not in the standard font.

This tool can open PDFs with viewing restrictions but cannot modify PDFs that require a password to open. You'll need to unlock the PDF first using a password remover tool.

The watermark is embedded into the PDF content. While it can technically be edited with professional PDF software, it provides a deterrent against casual copying and establishes ownership.

Watermarks are typically subtle, semi-transparent overlays for branding or copyright protection. Stamps are bold, prominent text (like DRAFT or APPROVED) to indicate document status. For stamps, use our PDF Stamp tool.

There's no enforced limit since processing happens in your browser. However, very large PDFs (100MB+) may slow down your browser. For best performance, keep files under 100MB.

We offer a complete PDF toolkit: Merge PDFs, Extract Pages, Reorder Pages, Stamp PDF, Images to PDF, Text to PDF, PDF to Images, PDF Info Viewer, Metadata Editor, and Certificate Generator. All tools are free and privacy-first.