His work is defined by a precise, technical clarity. Collaert often translated the compositions of painters like Marten de Vos into the linear language of engraving. He focused on clear outlines and systematic hatching to create volume. This method allowed for reproductions that maintained the clarity of the original design. His subjects ranged from religious cycles to studies of the natural world. He avoided the heavy ornamentation common in his era, preferring a balanced and legible aesthetic.

Modern collectors value Collaert for his technical mastery and historical accuracy. His prints offer a window into the intellectual interests of the Renaissance. The clean lines of his engravings suit contemporary interiors that favour minimalism and graphic detail. These works represent the height of Flemish craftsmanship before the Baroque period. They provide a sense of historical continuity without the visual clutter of later styles.