Travel Adapter for Japan: Do You Need One? (Vietnam → Japan)Adapter Needed

If you're heading to Japan from Vietnam, sorting out the power situation is one of the easiest pre-trip wins. Below you'll find the plug types, voltage, and frequency used in Japan, whether you need an adapter, and which devices are safe to plug in.

Do you need a travel adapter for Japan?

Good news: you generally don't need a plug adapter. Both Vietnam and Japan use Type A outlets, so your existing plugs should fit Japan's sockets directly. A universal adapter is still worth keeping in your bag as a backup for future trips.

What plugs and sockets does Japan use?

Japan uses these power plug types: Type A: two flat parallel pins (ungrounded), the standard North American and Japanese plug; Type B: two flat pins plus a round grounding pin, common in North America. Outlets run at 100V and 50Hz/60Hz. Since Vietnam also uses Type A, your plugs already match.

Voltage and frequency in Japan

Japan supplies 100V at 50Hz/60Hz, which differs notably from the 220V used in Vietnam. This matters most for single-voltage, high-wattage appliances such as hair dryers, straighteners, curling irons, and electric kettles. Plugging a 220V-only device into a 100V outlet can overheat or destroy it. Check each device's label: if it reads "INPUT: 100-240V" it handles both and you only need a plug adapter; if it lists a single voltage, bring a voltage converter or leave it home.

Will your devices work in Japan?

Phones, tablets, laptops, and camera chargers are nearly always dual-voltage (100-240V), so they work in Japan with just your existing plug, and no converter is required. The devices to watch are heat-based appliances: hair dryers, flat irons, and travel kettles are often single-voltage and can fail on Japan's 100V supply. Many travelers simply buy a dual-voltage travel version or rely on the hotel's hair dryer.

What travel adapter should you buy for Japan?

Because Vietnam and Japan share Type A outlets, you don't need a special adapter for this trip. A universal travel adapter is still a smart, inexpensive backup if you plan to travel elsewhere, and the better ones add USB-C fast charging to free up your charger.

Tips for charging your devices in Japan

Pack at least one adapter per traveler, and consider a small power strip from home, which turns a single Japan outlet into several. Ordering online before you fly is almost always cheaper than airport kiosks.