Accurate MP3 transcription in 99 languages
HeyCaptions turns any MP3 – a podcast, lecture, interview or voice memo – into text with a Whisper-based speech recognition model running on our own GPUs. The language is detected automatically, and punctuation and paragraphs are added for you.
Every word is timestamped, so you can also download subtitles as SRT or VTT, or jump to any part of the recording.
Not just MP3
WAV, M4A, AAC, OGG, OPUS and FLAC files work the same way, as does the audio track of any video. Files up to 500 MB and 30 minutes are supported.

