I recently found one bitcoin converter which I like : https://www.vpnmentor.com/tools/bitcoin-rate/#bitcoinGraph
Give me your thoughts and show me better alternatives which you use.

usually i'm convert bitcoin to ethereum in https://shapeshift.io/ but now the fees is high,recommended convert to doge first Wink

I think you missed the point. He asked for a converter and do not exchange. Here is another one https://coinmarketcap.com/calculator/

Looks nice, but I like it ad free, simple and clean. I like more the one Fabioganga linked. Thanks anyway