Online IPA Phonetic Transcription http://lingorado.com/ipa/

This online converter of English text to IPA phonetic transcription at the link http://lingorado.com/ipa/
with the features as follow,

Features:

• British and American pronunciation.
• International Phonetic Alphabet (IPA) symbols used.
• Differences pronunciation depending on whether words are in stressed or weak position in the sentence.
• Other options

Example,

My name is Donald > maɪ neɪm iz ˈdɑnəld

She laughed at his idea > ʃi læft ət ɪz aɪˈdiə

I'm a new lecturer of international school, a faculty of Duy Tan University
aɪm ə nju: ˈlɛkʧərər əv ˌɪntərˈnæʃənəl sku:l, ə ˈfækəlti əv Duy Tæn ˌju:niˈvɜ:rsəti