Step-Up vs Step-Down Converters
A step-down converter lowers high voltage (e.g. 230V → 120V) for a low-voltage device; a step-up converter raises low voltage (120V → 230V) for a high-voltage device.
Travelers from the US (120V) visiting Europe/Asia (230V) usually need a step-down converter for single-voltage gear.
Travelers bringing 230V appliances to the US/Japan need a step-up converter, though most modern electronics are dual voltage and need neither.
Either way, the converter must be rated for more watts than your device draws (add 25–30% headroom).
Check your exact device and destination →
Related guides
- Adapter vs Converter: What's the Difference?
- What Does "100–240V" Mean? (Dual Voltage Explained)
- What Happens If You Plug 110V Into 220V?
Guidance only — not professional electrical advice. Always confirm against your device's label before plugging in. Local wiring (especially in hotels and older buildings) can vary.