UsefulTab
Audio Speed Changer
Speed up or slow down an audio file and download the result.
Open an audio file to change its speed
Drop an MP3, WAV, or M4A, pick a speed from 0.5x to 2x, preview, then download — all in your browser.
Runs entirely in your browserSpeed up or slow down audio
Open an audio file and choose a speed: above 1x plays it faster and makes the clip shorter, below 1x plays it slower and makes it longer. Handy for study recordings, dictation, transcription, or fitting a track to time. This changes speed the way a record player does — faster also raises the pitch and slower lowers it. It does not preserve pitch, so a big speed change will sound higher or lower; small changes (0.9x to 1.25x) stay natural. Preview the result, then download it as a WAV. The audio is decoded and resampled entirely in your browser and is never uploaded.
Common questions
Does changing the speed also change the pitch?
Yes. This tool resamples the audio, so speeding it up raises the pitch and slowing it down lowers it — like a record played faster or slower. It does not do pitch-preserving time-stretching, which needs a much heavier algorithm.
What speed range can I use?
From 0.5x (half speed, twice as long) to 2x (double speed, half as long). Small changes around 1x sound the most natural.
Are my files uploaded?
No. The audio is decoded and resampled locally with the Web Audio API. Nothing is sent to a server.
Why is the download a WAV?
Browsers reliably encode lossless WAV but do not provide an MP3 encoder, so the result is exported as WAV. Convert it to MP3 afterwards if you need a smaller file.