Generally speaking, have a look at the label on each power adapter (charger). It should show the allowed input voltage (or voltage range) and frequency (or frequencies). This could be something like 'Input AC 100-240 V 50/60 Hz'. Check whether the voltage and frequency in the country you visit are in accordance with the values on the label.
Usually, the voltage in European countries is somewhere between 220 and 240 V. The frequency is typically 50 Hz. Do verify the exact condition locally.
Please note that different countries use different power plugs. This means that a plug adapter (or a complete power cable with the correct plug) may be needed.