Also known as a step-down transformer, this device is specifically designed to reduce high-voltage input (220V) to a lower output (100V), making it ideal for powering 100V appliances in 220V regions. Best for: Home electronics, audio equipment, and devices requiring stable 100V. Discover reliable 220V inverters for RVs, homes, and off-grid systems. Find pure sine wave converters with LCD displays and multiple protection features. A 220 to 100 volt converter is an essential electrical device that enables appliances designed for 100V systems (such as those used in Japan) to operate safely on 220V power supplies (common in Europe, Asia, Africa, and many other regions). Learn more Shop products from small business brands sold in Amazon's store. This article provides a detailed overview of how to choose, use, and evaluate.