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Audio Speed Changer

· Last updated：2025-10-02

Change audio playback speed while maintaining original pitch using time-stretching algorithms

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Written by the Elysia Tools team
Audio312
Speed53
Pitch22
Tempo11

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Media
Input types
file, range, select
Output type
file
Sample coverage
4
API ready
Yes

Overview

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.

When to use

  • Speed up lectures, interviews, podcasts, or other spoken audio.
  • Slow down music or recordings for practice and easier listening.
  • Create an audio file in a selected format while changing its playback speed.

How it works

  1. 1Upload one supported audio file in MP3, WAV, FLAC, AAC, OGG, MP4, or M4A format.
  2. 2Set the playback speed between 0.25x and 4.0x, using 1.0x for normal speed.
  3. 3Choose an output format: MP3, WAV, FLAC, AAC, OGG, or M4A.
  4. 4Select low, medium, or high audio quality, then generate the processed audio file.

Use cases

  • Make spoken recordings faster for efficient study or review.
  • Slow audio for language listening, pronunciation practice, or musical analysis.
  • Prepare speed-adjusted audio in a format suited to a chosen playback workflow.

Examples

1. Speed up a recorded lecture

Student

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: High

Outcome

The lecture is converted into a faster MP3 recording without changing the speaker's pitch.

2. Slow down audio for pronunciation practice

Language learner

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.

FAQ

Will changing the speed alter the pitch?

No. The tool uses time-stretching to change speed while keeping the original pitch.

What speed settings are available?

You can choose any speed from 0.25x to 4.0x in 0.05x steps.

Which audio files can I upload?

Supported inputs include MP3, WAV, FLAC, AAC, OGG, MP4, and M4A audio files.

Which output formats are available?

You can export the result as MP3, WAV, FLAC, AAC, OGG, or M4A.

Does audio quality affect processing?

Yes. Low quality is faster, while high quality may take longer to process.

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3. Adjust a music practice recording

Musician

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: High

Outcome

The practice recording plays at half speed with the original pitch retained.