Watermark PDF Online
Stamp custom text or image watermarks onto your PDF pages. Customize position, transparency, and rotation.
Upload PDF to watermark
or tap to browse files from your device
High-Performance Developer API
Need automated batch PDF processing or background removal for your SaaS? Check our partner REST APIs.
How to Use Watermark PDF Online (Text & Image Overlay)
Follow these 3 simple steps to complete your task directly in your browser with zero server uploads.
Upload PDF File
Select the PDF file you wish to protect with a watermark.
Configure Watermark Options
Enter custom text or upload a PNG logo, set opacity, position, and rotation.
Apply & Download
Stamp pages locally and download your watermarked PDF.
100% Client-Side Browser Architecture
Unlike traditional web tools that upload your sensitive documents to remote servers over the internet, OmniTool Suite uses compiled WebAssembly (Wasm) binaries and HTML5 Canvas APIs inside background Web Workers. This guarantees absolute data privacy, instantaneous zero-latency conversions, and offline capability.
Frequently Asked Questions
Everything you need to know about Watermark PDF Online (Text & Image Overlay) privacy, speed, and limits.