Add Watermark to PDF

Welcome to the Atrium Tools PDF Watermark Adder. Protecting your intellectual property, labeling draft documents, or establishing brand identity is crucial when distributing digital files. This free utility allows you to permanently stamp your PDF files with customizable text or image overlays, directly within your web browser.

1. Text vs. Image Watermarks

You can choose between two primary watermark types using the tabs in the editor. Text Watermarks are perfect for stamping documents with statuses like "CONFIDENTIAL," "DRAFT," or "DO NOT COPY." You can fully customize the text, color, rotation angle, and opacity. Image Watermarks allow you to upload your company logo to brand the document. For the best results, we highly recommend uploading a PNG image with a transparent background so that the watermark doesn't obscure the text beneath it.

2. Live Preview Technology

Guessing where your watermark will land is frustrating. Our tool utilizes advanced HTML5 Canvas rendering to generate a live preview of the first page of your PDF. As you drag the opacity, size, or rotation sliders, the canvas instantly updates. This guarantees that your watermark is positioned exactly how you want it before you commit to downloading the final file.

3. Uncompromised Zero-Server Privacy

If a document is important enough to require a "CONFIDENTIAL" watermark, it is important enough to keep off remote cloud servers. Unlike standard online editors that require you to upload your PDF to the internet, Atrium Tools relies strictly on local DOM processing. Your PDF and your logos are loaded directly into your computer's RAM. Your files never leave your device and are never stored on our servers.

Frequently Asked Questions

Can a watermark be removed later?

While true permanent destruction of a PDF layer is difficult, our tool writes the watermark directly into the PDF matrix. Casual readers will not be able to simply select and delete it in standard viewing software. However, highly specialized PDF editing software can sometimes isolate and remove layers. For maximum security, you should consider flattening the PDF after watermarking it.

Why does my image watermark have a white box around it?

If you uploaded a JPG or JPEG image, the format does not support transparency. Therefore, any white space around your logo will cover up the PDF text behind it. To fix this, convert your logo into a PNG file with a transparent background before uploading it to the tool.

Does it work with password-protected PDFs?

No. To ensure your security, our local rendering engine cannot bypass encryption. If your document requires a password to open, the tool will fail to generate the live preview or apply the watermark. You must unlock the PDF first.