So you own bitcoin, and you want to turn it into cash? Facebook Twitter LinkedIn. Enter the amount you want to spend. Several popular online services not only allow people to easily purchase Bitcoin and other cryptocurrencies through their websites and smartphone apps, but also sell the cryptocoins they have for government-issued currency. Both offer the buying and selling of Bitcoin, Litecoin, and Ethereum , while Coinbase also supports Bitcoin Cash a completely separate cryptocurrency from Bitcoin and CoinJar has Ripple.