How is Zakat paid on money valued in Euros? Is it a condition to convert it to the local currency? And are fixed expenses deducted from the money before Zakat is paid?

It is preferable to pay Zakat (definition) al-Mal (charity on wealth) in the country where the wealth is located, following the saying of the Prophet (peace be upon him): "It is to be returned to their poor." If there are no eligible recipients for Zakat in that country, or if it is difficult to disburse it there, then it is permissible to transfer it to another country, with the closest one being preferable. It is permissible to pay Zakat in any currency, while considering what is most beneficial for the poor. As for deducting necessary expenses for the coming year from Zakat, the majority of scholars did not stipulate this, and that is the most preponderant opinion.