Audio Speed Changer
Speed up or slow down audio from 0.25× to 4× — keep the original pitch or let it shift like a tape deck.
How to Change Audio Speed in 3 Steps
Drop an audio file
Drag any MP3, WAV, M4A, OGG or FLAC onto the left pane. The waveform and a player appear.
Set the speed
Open Settings and drag Speed between 0.25× and 4×. Keep Preserve pitch for speech so voices do not turn into chipmunks, or choose Natural for a tape-style pitch change.
Run and download
Click Change speed. The new length is shown in the output badge and the result plays on the right.
Audio Speed Changer — Frequently Asked Questions
Is my audio uploaded anywhere?
No. The file is decoded by your browser's Web Audio engine, processed on your device and encoded to MP3 or WAV with an open-source encoder running in the page. Nothing is sent to a server.
What is the difference between the two modes?
Natural resamples the audio, so faster also means higher-pitched (like a sped-up record). Preserve pitch time-stretches it, keeping the pitch the same — right for podcasts, lectures and language practice.
Does preserve-pitch sound perfect?
For speech it is clean. Dense music at extreme settings (below 0.5× or above 2×) can show a slight flutter, which is inherent to time-stretching; try Natural mode or a smaller change if you hear it.
Which formats can I open and save?
Open anything your browser plays: MP3, WAV, M4A/AAC, OGG, Opus, FLAC and WebM audio. Save as MP3 (128, 192 or 320 kbps) or lossless 16-bit WAV. Pick the format under Settings before you run the tool.
How long does it take?
Processing is near-instant; MP3 encoding runs at roughly 15× real time, so a 5-minute song takes around 20 seconds. The progress bar shows the encode.