Watermark PDF
Add centered text stamps across every page of your PDF document directly in your browser. Configure custom text strings, font size, opacity transparency, and rotation angles with zero server uploads.
Drop your PDF here
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Convert JPG, PNG, WEBP, remove backgrounds, upscale, and resize with instant client-side WebAssembly.
How to Use
- 1Select or drag your PDF document into the browser watermarking panel.
- 2Type your desired watermark text string, such as DRAFT, COPY, or CONFIDENTIAL.
- 3Adjust the opacity percentage slider, font point size, and rotation angle in degrees.
- 4Click Add Watermark to render the text overlay across all pages using pdf-lib.
- 5Click Download to save your newly watermarked.pdf document.
Frequently Asked Questions
Can I apply an image logo or custom bitmap as a watermark?
No. This lightweight browser tool applies text-based watermark overlays using standard Helvetica typefaces. Bitmap and vector graphic watermarking are not supported in this interface.
Does the watermark modify existing document text or imagery?
No. The text stamp is layered directly onto each page canvas at the specified opacity level, preserving all existing page objects and vector structures underneath.
Are my confidential contracts uploaded to external servers?
No. All font rendering, opacity calculations, and document assembly run entirely inside your local browser memory. Zero files are sent to any remote server.