Add Watermark to PDF
Stamp diagonal or custom text watermarks onto all pages of your PDF document securely.
100% Secure & Private
Your files are processed directly on protected memory channels and automatically purged after download.
Lightning Fast Processing
High-performance vector rendering stamps crystal-clear diagonal text across all pages in seconds.
Zero Quality Loss
Retain 100% of your original document's fonts, layouts, hyperlinks, and vector sharpness.
How to Add a Watermark to a PDF
1
Upload Your Document
Drag and drop your PDF into the upload zone or click "Select File".
2
Type Watermark Text
Enter text such as "CONFIDENTIAL", "DRAFT", or your company name.
3
Download Watermarked PDF
Click the download button to instantly save your stamped PDF.
Frequently Asked Questions
No, the watermark is rendered as a semi-transparent background or overlay vector layer, ensuring all original text, tables, and images remain completely readable.
Yes! UMtoons Tools provides 100% free PDF watermarking with no limits, no watermarks added by us, and no subscription fees.
Absolutely. All uploads are processed securely via SSL encryption and automatically purged from our servers immediately after download.