Watermark PDF Online
Add custom text watermarks to your PDF documents instantly. Fast, secure client-side watermarking with no file uploads required.
Drag & Drop your PDF file here
or click to select a file from your computer
About Watermark PDF Tool
Our Watermark PDF utility lets you quickly stamp custom text across your PDF documents to protect intellectual property, mark drafts, or indicate confidentiality. Customize your watermark text, size, and transparency with ease.
Powered by local JavaScript processing, your private documents never leave your device or get uploaded to external cloud storage. All modifications execute directly inside your browser session for ultimate privacy and control.
How to Watermark PDF Files
Upload PDF File
Drag and drop your PDF document into the upload zone or choose it directly from your computer storage.
Configure Watermark
Type your custom watermark text and fine-tune settings like font size and opacity levels.
Stamp & Download
Click “Add Watermark Now” to apply the watermark locally in seconds and download your secured file.