Upload the audio file, pick a speed factor (0.25x to 4x), and download - the pitch stays the same, only the tempo changes.
Audio Speed Changer Online
Speed up or slow down an audio file, right in the browser.
Key features
- Pick one of eight preset speed factors, from 0.25x (four times slower) up to 4x (four times faster).
- Accepts mp3, wav, aac, ogg, flac, and m4a files, and always downloads a .wav file back - a re-mux that works the same way regardless of which of those formats you started from, so you don't need to check which output codecs your browser's ffmpeg build supports.
- Pitch stays the same - only the tempo changes.
How the speed change works
Changing speed re-encodes the audio (a fresh WAV render via the atempo filter, not a lossless copy), so it takes longer than a simple cut and the output is not byte-identical to the source.
This is a straight tempo change, not a pitch-shifted or reversed effect - a podcast sped up to 1.5x still sounds like the same voice, just talking faster.
Your privacy
The audio is re-rendered inside this browser tab, so the track you load is never sent to a server.
Frequently Asked Questions
What does Audio Speed Changer Online do?
Speed up or slow down an audio file, right in the browser.
When should I reach for audio speed changer online?
Changing speed re-encodes the audio (a fresh WAV render via the atempo filter, not a lossless copy), so it takes longer than a simple cut and the output is not byte-identical to the source. Pitch stays the same - only the tempo changes.
What complementary tools work well alongside audio speed changer online?
This tool only changes tempo - to trim or compress the audio instead, see the related-tools section.