Hi, dear. Thanks for your suggestion. In the description of our website, we have mentioned that only .mp3 is supported. Actually, the program is designed to transcribe .mp3 file and convert it to text. For example, if you have a .mp3 speech record(like VOA), you can transcribe it to plain text. It may boost some users’ productivities. (Of course, not all of the users will think this feature is useful)
I will add a new feature so you can use Microphone and record your voice. It will be more like speech-to-text.
Thank you for trying our program.