I have made registered on bloctrail and i can make download priv key. But i am still doubt it is offline wallet or online wallet, (in my opinion it is online wallet). thank you very much for your opinions.
its just another online wallet like blockchain.info . btw, do you know the difference between an online and offline wallet ? any service that generates the private keys online for you is called as an online wallet. using online wallets is not really recommended because it leads to certain risks like hacks and steals.