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Audio Slow Down

Slow down audio playback without changing pitch

Click to upload file or drag and drop file here

Maximum file size: 200MB Supported formats: audio/*

Key Facts

Category
Media
Input Types
file, number, select
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

The Audio Slow Down tool reduces playback speed without altering pitch, making it easier to transcribe, learn, or practice audio content.

When to Use

  • •When transcribing fast-paced audio recordings like interviews or lectures.
  • •For language learners to better understand spoken words at a slower pace.
  • •Musicians slowing down tracks to learn difficult sections or practice along.

How It Works

  • •Upload your audio file in a supported format such as MP3 or WAV.
  • •Set the speed factor between 0.25 and 0.99 to control the slowdown.
  • •Choose an output format from options like MP3, AAC, or FLAC.
  • •Download the processed audio file with adjusted tempo.

Use Cases

Transcribing interviews or lectures for academic research.
Slowing down podcasts to improve comprehension and note-taking.
Creating practice versions of music for instrument rehearsal.

Examples

1. Interview Transcription

Background
A researcher has a recorded interview with rapid speech that is hard to follow.
Problem
The audio is too fast to transcribe accurately in real-time.
How to Use
Upload the interview audio file, set speed factor to 0.75, and choose MP3 output.
Outcome
The slowed audio enables precise transcription without missing details.

2. Language Learning Aid

Student
Background
A student is studying French and finds native speakers talk too quickly.
Problem
Normal speed audio is difficult to understand for beginners.
How to Use
Upload a French lesson audio, reduce speed to 0.6, and save as WAV for clarity.
Outcome
The student can now follow along and improve listening skills.

3. Music Practice

Background
A guitarist is learning a fast solo from a recording.
Problem
The solo tempo is too quick to play along with at full speed.
How to Use
Upload the song file, set speed factor to 0.5, and output in FLAC format.
Outcome
The guitarist can practice the solo at a manageable tempo for better mastery.

Try with Samples

audio, file
Copyright-Free AAC Audio Samples
High-quality AAC encoded audio samples for testing and development, featuring nature sounds and meditation music with excellent compression
title token audio
audio
Copyright-Free MP3 Audio Samples
Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio
title token audio
audio
Copyright-Free WAV Audio Samples
Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
title token audio
audio
Copyright-Free OGG Vorbis Audio Samples
Open-source OGG Vorbis audio samples for testing and development, featuring excellent compression with nature sounds and meditation music
title token audio
audio

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FAQ

Does slowing down audio change the pitch?

No, the tool preserves the original pitch while adjusting the tempo.

What audio formats are supported for upload?

You can upload any common audio file, including MP3, WAV, and AAC.

What is the range for the speed factor?

The speed factor can be set from 0.25 to 0.99, with a default of 0.75.

Can I choose the output format?

Yes, select from MP3, AAC, M4A, OGG, Opus, FLAC, or WAV.

Is there a file size limit?

Yes, the maximum file size is 200 MB.

API Documentation

Request Endpoint

POST /en/api/tools/audio-slow-down

Request Parameters

Parameter Name Type Required Description
audioFile file (Upload required) Yes -
speedFactor number No -
outputFormat select No -

File type parameters need to be uploaded first via POST /upload/audio-slow-down to get filePath, then pass filePath to the corresponding file field.

Response Format

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}
File: File

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-audio-slow-down": {
      "name": "audio-slow-down",
      "description": "Slow down audio playback without changing pitch",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=audio-slow-down",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

Supports URL file links or Base64 encoding for file parameters.

If you encounter any issues, please contact us at [email protected]