The companies below let you buy bitcoin via ACH bank transfer. Using ACH bank transfers will help you buy bitcoin online and in larger quantities than other methods. Buying bitcoin with ACH transfer also often comes with lower fees.
ACH is a US transfer system. If you live outside the USA then use this page to find ways to buy bitcoins with a bank account or bank transfer.
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Coinbase is the world's largest bitcoin broker. In the United States you can buy bitcoin with a connected bank account via ACH bank transfer. Coinbase charges a flat 1.49% fee on all transactions. You'll have to wait five days to receive your bitcoin. If you add a Visa or Mastercard credit card to your account all bitcoin purchases besides your first will be delivered instantly.
Coinbase Exchange is only available in certain U.S. States. You can fund your account via ACH transfer.
Gemini is a Bitcoin exchange that serves both individual and institutional clients. You can fund your exchange account via ACH transfer or wire transfer. Currently available in 26 U.S. states.