Here's the one thing to understand before you buy anything: a travel adapter changes the shape of the plug so it fits a foreign wall socket — it does not change the voltage coming out of that socket. Those are two separate problems, and mixing them up is how people fry a hair dryer on their first day abroad. The good news is that for phones, laptops and most modern electronics, a simple adapter is all you need. This guide explains why, and when it isn't.
1. Plug shape vs voltage — the key concept
Different countries use different socket shapes and different mains voltages. Broadly, much of the world runs around 220–240V while North America and some others run around 100–120V (and frequencies differ too). An adapter only handles the first problem:
- An adapter mechanically reshapes your plug to fit the foreign socket. It passes the local voltage straight through.
- A converter (or transformer) actually steps the voltage up or down so a single-voltage device gets what it expects.
So the real question isn't "will it fit?" — an adapter answers that. It's "can my device handle the local voltage?"
2. Check the label: is your device dual-voltage?
Look at the small print on the charger or device (or its power brick). If it says something like "INPUT: 100–240V", it's dual-voltage — it works on the electricity anywhere in that range, and a plug adapter alone is enough. Most phone chargers, laptop bricks, camera chargers and tablet chargers are dual-voltage today.
| Label says | What it means |
|---|---|
| 100–240V (a range) | Dual/multi-voltage. A plug adapter is enough almost anywhere. This covers most phones, laptops and USB chargers. |
| Single value (e.g. 120V only) | Single-voltage. Plugging it into higher-voltage mains through only an adapter can damage it — you may need a voltage converter. |
When in doubt, read the label on your specific device — it is the definitive source, not any general guide.
3. When you actually need a converter
The devices that catch people out are single-voltage, high-wattage heating appliances — think some hair dryers, flat irons, curling irons and travel kettles. These both draw a lot of power and often run on one voltage only.
- Dual-voltage electronics (phones, laptops, most chargers): adapter only.
- Single-voltage high-watt heat tools: you may need a voltage converter rated for the wattage — and even then, results vary, so check the manufacturer's guidance.
- Simplest fix for hair tools: buy a dual-voltage travel version, or use what the hotel provides, and skip the converter entirely.
4. Ports, plug types and buying tips
A good universal adapter does more than reshape a plug. The features worth having:
- USB and USB-C ports let you charge phones and small devices directly, without your own bricks — a USB-C Power Delivery (PD) port can even run many laptops.
- Coverage for the plug types you'll meet. Plug types are labeled by letter (roughly A/B in North America, C/E/F across much of Europe, G in the UK and Ireland, I in Australia, and others). A "universal" adapter aims to cover the common ones — confirm it fits your destinations.
- A fuse and solid build add a margin of safety and durability.
- Remember an adapter isn't a converter — it will happily pass 230V to a 120V-only appliance.
Packing your tech? See the travel packing list, keep power banks in the cabin per power bank flight rules, and slot the adapter into your carry-on.