Watermarker 1.3 (Mac App Store link) gives you a way to solve this problem by superimposing a mark of your choosing to an existing picture, thus “stamping” with your particular imprint.

Watermarker provides a simple and automated way to add watermarks to images. You can choose between various options including text, your own logo, or even a customizable strikethrough. The app has a ...

Watermarker provides a simple and automated way to add watermarks to images. You can choose between various options including text, your own logo, or even a customizable strikethrough. The app has a ...

Bronson Watermarker fills a small--but vital--niche for those who need to create watermarked PDFs and images. You can even export your files as a single image to make sure that someone can't strip ...

Bronson Watermarker PDF is a Mac utility for creating personalized watermarked PDFs. Version 2.01 adds support for encryption, password protection, and localizes the app for German, ...