The official developers of Visual Watermark offer a free version. While it may have limitations compared to the "Pro" version, it is safe, legal, and guaranteed to be virus-free.

Tools like DigiKam or GIMP are completely free and open-source. They offer powerful batch-processing features that allow you to add watermarks to hundreds of photos at once without any cost.

Using cracked software is a violation of copyright laws. Furthermore, it denies developers the compensation they need to maintain and improve the tool. Safe and Affordable Alternatives