The size of thermal paper you buy should be determined based on your usage needs, and there is no size limit. Because the size of thermal paper can vary depending on the specifications of the printing device and the needs of the buyer. The width of some printing devices may only be able to print narrow sizes, while the width of some printing devices can print wider thermal paper. When purchasing, you need to choose the appropriate size based on your specific usage needs. In addition, thermal paper can also be customized. For example, if you need to print labels or barcodes of a specific size in a specific scenario, you can customize it to meet your needs.