Audio Speed Changer
Use Audio Speed Changer, review the result, and keep the original until the output is checked.
How to use Audio Speed Changer
- Add the audio files you want to retime.
- Set Playback Speed with the slider or its 0.5x to 2.0x presets; anything from half speed to triple is available.
- Choose Audio Quality (Bitrate) and an Output Format.
- Press Convert All and Download All - each file becomes <name>_speed_<n>_<d>.<format>.
What Audio Speed Changer actually does to your file
Speed is changed with a tempo filter, so the duration changes while pitch stays the same - a quarter-speed narration does not come out as a lowered voice. WAV output ignores the bitrate setting because it is uncompressed, and any run re-encodes the audio, so keep the highest bitrate you can tolerate if the file will be edited again.
Audio Speed Changer FAQ
What does Audio Speed Changer do?
The Audio Speed Changer is a free online tool that lets you adjust the tempo and pitch of your audio tracks. You can speed up or slow down songs, shift pitch without losing quality, and instantly download the edited file. No software required—works direct
Which files work with Audio Speed Changer?
This category commonly supports MP3, WAV, AAC, OGG, and M4A. Use the accepted file types shown in the uploader, because support varies by browser and by the engine behind each tool.
Does the audio pitch change with the speed?
It can. Check the preview with sound before downloading, because a faster tempo raises pitch unless the tool re-pitches it.
Will my original file be changed?
No. The work is done on a copy in this tab by your browser's audio decoder and a WebAssembly build of ffmpeg, and the result arrives as a separate download, so your original is still there if you need it.
How is my file processed?
It is not uploaded. The processing is done locally by your browser's audio decoder and a WebAssembly build of ffmpeg, so the practical ceiling is your device's memory and the limit shown beside the uploader - no queue, no account, no copy on a server.
Is the Audio Speed Changer free?
Yes. The Audio Speed Changer is free with no trial limit, subscription, or watermark on downloads. You can use it for personal and commercial projects without creating an account.