Four common rates
Choose 16 kHz for speech or 44.1/48 kHz for general audio.
Create an MP3 at a selected sample rate for compatibility and audio workflows.
🔒 Your media file is never uploaded to Voysum.
Choose 16 kHz for speech or 44.1/48 kHz for general audio.
FFmpeg handles decoding and sample-rate conversion.
The source file stays in your browser.
How local browser processing works and what to expect.
16 kHz is commonly sufficient for speech-focused audio.
No. Upsampling cannot recreate detail absent from the source.
Convert audio to MP3 at 64, 96, 128, 192, or 256 kbps locally.
Open tool →Free browser toolJoin two audio files into one MP3 locally in your browser.
Open tool →Free browser toolJoin two compatible MP4 videos locally without uploading them.
Open tool →Voysum can transcribe the converted recording and create subtitle files.
Transcribe audio