Add Watermark to PDF
Add customizable text watermarks to your PDF pages. Choose your watermark text, adjust font size, color, opacity, and rotation angle. Preview the watermark on the first page before applying. Optionally exclude specific pages from watermarking. Runs entirely in your browser — your files never leave your device.
Drop a PDF here or click to browse
Your file never leaves your device
How to Add a Watermark
Stamp custom text across your PDF pages — no signup required.
Upload your PDF
Drag and drop a PDF onto the upload area, or click to browse your device.
Customize watermark
Enter your watermark text and adjust size, color, opacity, and rotation. Preview updates live.
Apply watermark
Click 'Apply Watermark' to stamp every page (or exclude specific pages).
Download
Download your watermarked PDF instantly. The original file is not modified.
Why Add a Watermark?
Watermarks protect your documents by visually marking them as drafts, confidential, or belonging to a specific organization. They discourage unauthorized distribution and make document provenance clear.
Our tool lets you control every aspect of the watermark: text content, font size, color, transparency, and rotation. The live preview ensures you get exactly the result you want before applying.
Everything runs entirely in your browser using pdf-lib. No files are uploaded, no accounts are needed, and your documents remain completely private.
Frequently Asked Questions
Are my files uploaded to any server?
No. All processing happens entirely in your browser. Your documents are never uploaded or stored anywhere — they stay on your device.
Can I customize the watermark text?
Yes. You can set any text, adjust font size, pick a color, change opacity, and control the rotation angle. The live preview shows exactly how it will look.
Can I exclude certain pages?
Yes. Enter page numbers or ranges (e.g. '1, 5, 10-14') in the exclude pages field, and those pages will be left untouched.
What fonts are supported?
The watermark uses Helvetica, a standard PDF font available in all PDF viewers. This ensures consistent rendering across every platform.
Does it support image watermarks?
Currently only text watermarks are supported. Image watermark support may be added in a future update.
Is there a page or file size limit?
No hard limit. Processing runs in your browser, so the practical limit depends on your device's available memory. Files with hundreds of pages typically work fine.
Related Tools
Merge PDF
Combine multiple PDF files into one document. Drag to reorder, preview pages — 100% private, no uploads.
Split PDF
Split a PDF into separate pages or custom page ranges. Download as individual files or a ZIP — 100% private, no uploads.
Compress PDF
Reduce PDF file size while maintaining quality. Compress images, remove duplicates, and optimize streams — 100% private, no uploads.