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Change audio playback speed while maintaining original pitch using time-stretching algorithms
Execution
Fill in the form, run the tool, and review the result in one place.
Samples
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Tool usage guide
Audio Speed Changer adjusts the playback speed of an audio file from 0.25x to 4.0x while keeping the original pitch unchanged. Upload a supported audio file, choose a speed and output format, then download the processed audio file.
Background
A student has a recorded lecture in MP3 format and wants to review the material in less listening time.
Problem
The original recording is too slow for a quick review session.
How to use
Upload the MP3 file, set the speed to 1.5x, keep the pitch unchanged, and select MP3 as the output format.
Speed: 1.5x; Output format: MP3; Quality: HighOutcome
The lecture is converted into a faster MP3 recording without changing the speaker's pitch.
Background
A language learner is working with an AAC recording and needs more time to hear individual words clearly.
Problem
The normal-speed recording is difficult to follow during listening practice.
How to use
Upload the AAC file, choose a slower speed such as 0.75x, and export the result as M4A.
No. The tool uses time-stretching to change speed while keeping the original pitch.
You can choose any speed from 0.25x to 4.0x in 0.05x steps.
Supported inputs include MP3, WAV, FLAC, AAC, OGG, MP4, and M4A audio files.
You can export the result as MP3, WAV, FLAC, AAC, OGG, or M4A.
Yes. Low quality is faster, while high quality may take longer to process.
Media
Change the number of channels (mono/stereo) while keeping the same format
Speed: 0.75x; Output format: M4A; Quality: MediumOutcome
The speech plays more slowly while preserving the original voice pitch.
Background
A musician has a WAV practice recording and wants to rehearse a passage at a reduced speed.
Problem
The recording is too fast for accurate practice at normal playback speed.
How to use
Upload the WAV file, set the speed to 0.5x, select WAV output, and choose high quality.
Speed: 0.5x; Output format: WAV; Quality: HighOutcome
The practice recording plays at half speed with the original pitch retained.