The plug you will find in Brazil
Brazil officially uses the type N standard, with three round pins. You may also find sockets that accept some European plugs with two round pins, but do not assume compatibility: check your charger before plugging it in.
An adapter is not a transformer
An adapter only lets the plug physically fit into the socket. It does not change the voltage. A transformer or converter serves a different purpose and should only be used when the device actually requires one.
110, 127 or 220 V: do not guess
In Brazil, voltage varies by city and even by installation. In Rio de Janeiro, 127 V is common, but accommodation and specific circuits may supply 220 V. Check the socket label or ask at your accommodation before connecting a sensitive device.
How to tell whether your charger will work
Look for this word on the label INPUT. Many phone, laptop, camera and tablet chargers show something like “100–240 V, 50/60 Hz”. This means they accept a wide voltage range; you may still need an adapter for the plug shape.
My advice: check this label at home in good light. It is much better to discover before travelling that your hairdryer or appliance needs a different voltage than to find out in front of the hotel socket.
Devices that need extra attention
Hairdryers, hair straighteners, shavers, coffee makers and heat-producing appliances may not support both voltages. If the label shows a single voltage, do not connect the device to a different voltage without suitable equipment.
At your accommodation
If a socket is marked 220 V, follow that indication. If it is unlabelled and you are unsure, ask the host, reception or owner. Do not test an expensive device just to “see whether it works”.
What I would bring
A good-quality compact adapter, original or certified chargers and, if you rely heavily on your phone, a power bank. A small travel power strip can be useful when your accommodation has few sockets, provided it is compatible with the installation and the power requirements of the connected devices.
Before travelling
Check the plug, voltage range and power rating of every important device. If anything is unclear, consult the manufacturer’s manual. With modern phones and laptops, the issue is usually the plug shape; with heat-producing appliances, voltage needs much closer attention.
