Audio Speed Changer
Speed up or slow down any audio from 0.5× to 2× — right in your browser.
Drop an audio file, or click to browse
MP3, WAV, M4A, OGG, FLAC, AAC — up to about an hour
Processed locally — your file never leaves this tab
00:00.00 / 00:00.00
Adjust — fades, volume, speed, reverse
Precise times
Turn a 40-minute lecture into 20 fast minutes, slow a guitar solo down to half speed for practice, or fit a track into a shorter video slot. Drag the speed slider, hear the change instantly, and export — the audio is resampled on your device and never uploaded.
How to use the Audio Speed Changer
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Drop your file
Add an MP3, WAV, M4A or other audio file — it stays on your device the whole time.
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Set the speed
Drag the speed slider between 0.5× and 2×. Use the waveform to select just a section if you only want part of the file changed.
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Preview and export
Play the result to check the pace, then save it as MP3 or WAV. A 10-minute file at 2× exports in about a second.
Frequently asked questions
Does changing speed change the pitch?
Yes — speed and pitch move together, like a record played faster or slower: 2× sounds about an octave higher, 0.5× about an octave lower. That is the classic effect; keeping pitch while changing tempo needs a dedicated time-stretch algorithm we may add later.
What speeds can I choose?
Anything from 0.5× to 2× in 0.05 steps. Half speed is the sweet spot for transcribing fast speech or learning solos; 1.25–1.5× is comfortable for skimming lectures and podcasts.
How fast is the export?
The speed change is rendered offline by your browser at native speed — a 10-minute track takes a second or two regardless of the factor you choose.
Can I speed up only part of a track?
Yes. Select the section on the waveform, set the mode to Keep selection, then choose your speed — the export contains just that part, faster or slower.
Is there a file length limit?
No artificial one. The practical ceiling is your device memory — roughly an hour of audio on a typical computer.
Related tools
Reverse Audio
Play any song or recording backwards — one click, right in your browser.
Open Reverse Audio
MP3 Editor
Cut, fade, reverse and speed up audio — all in one browser tab.
MP3 Volume Booster
Boost quiet recordings up to 4× — with a limiter, so nothing clips.