Converter?

From RS Travel Tips
https://www.ricksteves.com/travel-tips/phones-tech/electric-adapters-converters

Check whatever you plan on plugging in, and if the fine print lists both 110V and 240V, then all you need is the plug converter. This is a small unit with two round male prongs to fit the European outlet, and on the back the two slots for the American 110V flat prongs. If you plan on anything that does not include the 240V on the label, you'll need a voltage converter. Seems that all cell phone / camera chargers are dual voltage these days, unlike several years ago when you had to carry the converters.

European electrical outlets are different than North American ones, requiring a different plug; so an adaptor (not converter) is needed.

European electrical outlets are 220 volts, while North American ones are 110. If your device is dual voltage (110-220) then all you need is an adapter. If it is single voltage, then you would need a converter AND an adapter.

Note that electronic devices ( phones, tablets, computers) are all dual voltage. You can check the tiny writing on the charger. Personal care appliances (hair dryer, flat iron, curling iron) OTOH, almost never are, unless you buy a travel appliance that specifically states it is dual voltage. You COULD buy a converter for these; but they can be heavy, bulky, and have been known to fail. Resulting in a fried appliance and possible damage to the electrical outlet and wiring.

What are you charging?

Adapter yes, converter no. At least 90% of the time for the latter.

Make sure you understand the difference. If in doubt, wait to buy until you get there and go to a FNAC.

I travel with a handful of cheap plug adapters (they are easy to lose and leave behind). Converters are not necessary. Hotels and rentals all have hair dryers -- if you need anything else like a curling iron, get a european one