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Web Speech API SpeechRecognition Demo

This Web Speech API Speech Recognition Demo uses getUserMedia() and the Web Speech API's SpeechRecognition interface.

It uses the following main SpeechRecognition properties:

  • continuous
  • interimResults
  • lang

How to use

  1. Grant camera + microphone permissions
  2. Select a language (default is english)
  3. Start a recording
  4. Speak in the chosen language a few times
  5. Stop the recording

Main features

  • Real-time captions while recording
  • Multi-language captions
  • Generated .rtt, .srt and .JSON files with the resulted transcription after a recording stops
  • Subtitle file generated and applied for the video playback

Works on

  • Chrome 33+
  • Edge 79+
  • Safari 14.1+ on macOS
  • Safari on iOS 14.5+

Known issues

  • No support for Firefox and Opera yet
  • Only works when connected to a network
  • It takes a few extra seconds for the Speech Recognition API to figure out when a non-english sentence ends