Adding a logo or image watermark to your PDF is the best way to protect brand identity and copyright. smaller-pdf.com lets you do this directly in your browser without uploading files to any server.
Upload your PDF and logo image, select opacity and position, then click Add Watermark. The image will be embedded on every page. PNG with transparent background works best for clean watermarks.
Completely free, unlimited use, no registration required. All processing is 100% browser-based. Your files and logo remain private on your device.
PNG, JPEG, WebP. PNG with transparency works best for logos.
No. All processing happens in your browser. Files never leave your device.
Yes. The watermark scales proportionally to fit the page width.