If you're not interested in the file format but instead want to convert English to IPA symbols, you can use a website like Upodn.com.
Ọ bụrụ na ịnweghị mmasị na ụdị faịlụ IPA, ma kama ịchọrọ ịtụgharị English gaa akara IPA, ịnwere ike iji weebụsaịtị dị ka Upodn.com.