HDFC bank allows you to redeem the reward points into cash only for the following HDFC credit cards. They are 

  1. Titanium Edge
  2. Platinum Edge
  3. Money Back
  4. Business Money Back
  5. Solitaire
  6. Freedom
  7. Bharath Cashback

The reward points and cashback ratio vary depending on the credit card. For example, Bharath cashback and Freedom credit cards have 1 reward points equal to 1 rupee while you need 10 or 5 reward points to get one rupee. 

The reward points accumulated on other credit cards cannot be converted to cashback and they can be redeemed against a wide range of gifts and vouchers.