Voiser is a text-to-speech and speech-to-text program that uses artificial intelligence to convert written text into natural-sounding speech and audio files into written text. It offers over 550 different voice options in 75+ languages, making it the closest machine voice to a human voice.

To use Voiser for text-to-speech, simply enter the text you want to convert into speech, select the desired language and voice, and click on the 'Convert to Speech' button. The program will generate an audio file of the text being read aloud in the selected voice. For speech-to-text, select the file you want to transcribe, choose the desired language, and click on the 'Convert to Text' button. Voiser will transcribe the speech in the audio file into written text.