Flexible speed
Choose values from half speed to double speed.
VoysumPrivate browser tool
Audio Speed Changer
Change playback speed from 0.5× to 2× and download a new MP3.
No uploadNo accountFree to use
✓ Runs locally in your browser
↥Choose or drop a fileaudio/*, .mp3, .wav, .m4a, .webm · up to 500 MB
🔒 Your media file is never uploaded to Voysum.
Private by default
Useful conversion without giving up your file.
Pitch-aware processing
FFmpeg adjusts tempo without a simple sample-rate trick.
Completely local
Audio never uploads to a server.
Common questions
Audio Speed Changer FAQ
How local browser processing works and what to expect.
Which speeds are supported?
The current tool supports 0.5× through 2×.
Will quality change?
Re-encoding and tempo processing can cause a small quality change.
Keep working
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Trim audio locally in your browser and download only the section you need.
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Open tool →Free browser toolAudio Volume Normalizer
Normalize perceived audio loudness locally in your browser.
Open tool →Turn this recording into searchable text.
Download the result, then upload it to Voysum for an editable transcript plus TXT, SRT, VTT, and CSV exports.
Continue to audio transcription