The website is an application of speechSynthesis api. The SpeechSynthesis interface of the Web Speech API is the controller interface for the speech service; this can be used to retrieve information about the synthesis voices available on the device, start and pause speech, and other commands besides.
This website allows the user to add in the text and change speed and pitch of the voice they select.
Try it out at : https://shreyajana2001.github.io/Speech-Synthesis/