Add Watermark to PDF Online
Stamp custom text watermarks (e.g., CONFIDENTIAL, DRAFT, SAMPLE) across your PDF pages. Customize font size, rotation angle, color, and opacity. Processed locally in your browser.
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How to use Watermark PDF
- 1
Upload your PDF document.
- 2
Type your custom watermark text (such as 'CONFIDENTIAL', 'DRAFT', or 'SAMPLE').
- 3
Select a color preset and adjust font size, opacity, and rotation angle using the sliders.
- 4
Click 'Apply Watermark & Download' to stamp the overlay across all pages and save.
Capabilities
- Custom text watermark generation stamped diagonally across all pages
- Adjustable sliders for font size (16px to 96px) and rotation (-90° to 90°)
- Variable opacity (5% to 90%) to keep underlying document text legible
- High-contrast color presets: Red, Gray, Blue, and Black
- Client-side vector text drawing directly via pdf-lib
How to Add Custom Text Watermarks to PDF Online
Distributing preliminary proposals, draft manuscripts, or confidential agreements requires clear visual identification to prevent unauthorized copying. WebTorq allows you to stamp customized text watermarks diagonally across your PDF pages in seconds.
Fine-tune transparency with the opacity slider to ensure the watermark remains easily legible without obscuring underlying document text.
Watermark text is drawn using Helvetica vector glyphs directly via pdf-lib in browser memory, maintaining sharp rendering at all print resolutions.
Use Flatten PDF to lock your watermark into the page canvas so it cannot be selected or altered by recipients.
This tool operates in a sandbox directly inside your web browser. All parsing, processing, and downloads are rendered locally. Your file size, metadata, and contents never cross the network. It works completely offline.
Frequently Asked Questions
Can I customize the watermark text, angle, and opacity?
Yes. WebTorq provides interactive controls to type custom text (e.g. 'CONFIDENTIAL', 'DRAFT', 'SAMPLE'), adjust opacity from faint to prominent, set the font size, and choose your rotation angle.
Is the watermark stamped on every page?
Yes. The watermark text is stamped consistently across every page in the uploaded PDF document.
What colors can I choose for my watermark?
You can select from four high-visibility presets: Red, Gray, Blue, and Black, allowing you to match the formal tone of your document.
Can a recipient remove the watermark text easily?
The watermark is embedded as a vector text layer. To prevent recipients from editing or selecting the watermark, you can run the document through our Flatten PDF tool to bake it into static page graphics.
Are my documents uploaded to a remote server?
No. All watermark rendering and document rebuilding take place inside your browser; the document is not sent to WebTorq for processing.