How to Add Text or Logo Watermark to PDF Online for Free
- Step 1: Upload your PDF — Drag and drop your document into the box or browse from your device.
- Step 2: Customize Watermark — Enter custom text or upload a transparent PNG logo. Adjust position, angle, font size, and opacity with real-time live preview.
- Step 3: Click Apply Watermark — The high-speed browser engine embeds the watermark into the native document streams in seconds.
- Step 4: Download PDF — Save your watermarked PDF document with zero quality loss.
Government, Legal & Corporate Document Protection
One Resizer provides tools designed to help prepare documents and photos for online submissions and application portals:
- Identity Protection: Stamp "FOR APPLICATION USE ONLY" or "CONFIDENTIAL" across scanned ID cards, passports, and utility bills to prevent unauthorized reuse.
- Native PDF Stream Preservation: Unlike basic tools that rasterize the whole PDF into blurry images, One Resizer draws vector text and logo stamps directly onto the PDF structure, keeping text selectable and vectors crisp.
- 100% Client-Side Privacy: Sensitive business proposals and personal documents are processed entirely within your web browser with zero remote uploads.
Frequently Asked Questions
Yes. One Resizer supports custom text stamps (with custom fonts, rotation, and colors) as well as transparent PNG or JPG image logos.
No. One Resizer stamps watermarks directly into the native PDF page streams, keeping all original text, vectors, and graphics crisp.
Yes. You can choose 'All Pages' or select specific pages to stamp, with instant live preview of any page.