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.
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.
The file is processed in this browser tab and is never uploaded to a server.
Pick one of eight preset speed factors, from 0.25x (four times slower) up to 4x (four times faster). The tool 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.
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.
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.