Transferwise is an online money transfer service that allows users to send money anywhere in the world. They use the mid-market exchange rate, which is usually much better than the rate banks offer. They also charge a much lower fee than banks, usually a fraction of the cost.
Transferwise is generally very safe. They are regulated by the Financial Conduct Authority in the UK, and they use bank-level security measures to keep your money secure.
In terms of fees, their fees vary by country. For transfers to the US and Canada, their fees are usually 1.5% of the total amount sent, with a minimum fee of $3. For transfers to Brazil, their fees are usually 1.4% of the total amount sent, with a minimum fee of $3.50.