Recently we added the support for bopomofo, also called zhuyin, in our online Pinyin converter.
If you use bopomofo, you will probably want to adjust the relative size of transcription. You can do that by going to your account, clicking on “Customize my experience” and then adjusting the setting “Relative size of transcription”.
At the same time, we fixed several small bugs and made some adjustments in the IPA phonetic transcription.