GenFactories / Audio Speed Changer

Audio Speed Changer

Speed up or slow down any audio file — instantly in your browser. Export as WAV.

🔒 Your files never leave your browser. All processing happens locally.
🎵
Drop audio file here or click to browse
Supports: MP3, WAV, OGG, AAC, M4A, FLAC
💡 How to Use
1

Upload Audio

Drop or select an MP3, WAV, OGG, AAC, M4A, or FLAC file.

2

Choose Speed

Pick a speed from 0.25× (very slow) to 2× (double speed). Preview before exporting.

3

Export & Download

Click Export WAV to render and download the speed-adjusted audio file.

📢 Share This Tool

How to Use Audio Speed Changer

  1. 1
    Upload your audio
    Drag and drop or click to upload an MP3 or WAV file.
  2. 2
    Set the speed multiplier
    Use the slider to choose a speed: 0.5× (half speed) to 2× (double speed). 1× is the original speed.
  3. 3
    Preserve pitch (optional)
    Toggle pitch preservation to change speed without the chipmunk or slow-motion voice effect.
  4. 4
    Preview and download
    Click Preview to listen, then Download to save the speed-adjusted audio file.

Features

Use Cases

Speed up lecture recordings

Listen to recorded lectures at 1.5× or 2× speed to consume content faster while retaining comprehension.

Slow down music for practice

Musicians can slow down a recording to learn difficult passages at a comfortable pace.

Create slow-motion voice effects

Slow audio to 0.5× for dramatic or cinematic voice-over effects in video productions.

Accessibility for spoken content

Slow down fast-spoken content to make it more accessible for listeners with comprehension needs.

Speed up boring recorded content

Get through long meeting recordings, interviews, or tutorials in less time.

Frequently Asked Questions

Q: Is my audio file uploaded anywhere?

No. Speed adjustment is done using the Web Audio API in your browser. Your file is never transmitted.

Q: What does pitch preservation do?

Without pitch preservation, speeding up audio raises the pitch (chipmunk effect). With preservation, the pitch stays natural.

Q: What speed range is available?

From 0.25× (quarter speed) to 3× (triple speed).

Q: Does speed change affect audio quality?

Slight quality reduction may occur at extreme speed values. For moderate changes (0.75× to 2×), quality is generally very good.

Q: What formats are supported?

MP3 and WAV input. Output is in the same format as the input.

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