Sketch viewers are an essential tool for designers, allowing them to easily share and collaborate on design files. These viewers enable team members to view and comment on sketches without the need for specialized software. By using a sketch viewer, designers can streamline their workflow, enhance communication, and increase productivity. Furthermore, sketch viewers provide a convenient platform for presenting and discussing design concepts with clients and stakeholders. Overall, integrating a sketch viewer into your design process can result in improved collaboration, efficiency, and overall design quality.