A rotary trimmer is a cutting tool used for precise and clean cutting of paper and other materials. It features a circular blade that rotates as it moves along a guide rail, allowing users to trim sheets to specific sizes. This tool is popular in offices, schools, and craft projects for its efficiency and accuracy. These trimmers come in various sizes and designs, often equipped with safety features to protect users. Some models include additional features like adjustable cutting guides and multiple blades for different cutting styles, making them versatile for tasks involving crafting, scrapbooking, or document preparation.