MP3 to AMR Converter

Convert MP3 audio files to AMR (Adaptive Multi-Rate) format

Click to upload file or drag and drop file here

Maximum file size: 20MB Supported formats: audio/mpeg, audio/mp3, .mp3

Upload an MP3 file to convert to AMR

AMR supports various bitrates optimized for different speech quality levels.

AMR is mono-only for speech applications.

Key Facts

Category
Images, Audio & Video
Input Types
file, select, checkbox
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

The MP3 to AMR Converter allows you to easily convert MP3 audio files into the highly compressed AMR (Adaptive Multi-Rate) format, which is optimized for speech and voice recordings. By adjusting the AMR bitrate mode and preserving metadata, you can generate compact audio files perfect for legacy mobile devices, voice messaging systems, and efficient storage.

When to Use

  • •When you need to compress voice recordings or speech audio to save storage space on mobile devices.
  • •When preparing audio files for legacy mobile networks or telecommunication systems that exclusively support the AMR format.
  • •When optimizing voice-based audio files for low-bandwidth streaming or messaging applications.

How It Works

  • •Upload your source MP3 audio file (up to 20MB) using the file selector.
  • •Select your preferred AMR bitrate mode, ranging from 4.75 kbps for maximum compression to 12.2 kbps for the best speech quality.
  • •Choose whether to preserve the original audio metadata and click convert to generate the mono AMR file.

Use Cases

Converting MP3 voice memos to AMR to save storage space on older mobile handsets.
Preparing speech audio clips for integration into telecom IVR (Interactive Voice Response) systems.
Compressing podcast drafts or spoken-word audio for low-bandwidth distribution.

Examples

1. Optimizing Voice Memos for Legacy Devices

Telecom Administrator
Background
A telecom administrator needs to upload voice prompts to an older Interactive Voice Response (IVR) system that only accepts AMR files.
Problem
The original voice prompts are recorded in high-quality MP3 format and are too large for the system's storage limits.
How to Use
Upload the MP3 voice prompt, select the recommended 12.2 kbps bitrate for clear speech, ensure the channel is set to Mono, and convert the file.
Example Config
Bitrate: 12.2 kbps, Channels: Mono (1 channel), Keep Metadata: Enabled
Outcome
The administrator receives a highly compressed AMR file that fits perfectly within the IVR system's storage constraints while maintaining clear voice quality.

2. Compressing Spoken Word Audio for Low-Bandwidth Archiving

Archivist
Background
An archivist is managing thousands of hours of spoken-word lectures and needs to minimize storage costs.
Problem
Storing these lectures as MP3s consumes too much server space, but the audio is purely speech and does not require high-fidelity music quality.
How to Use
Upload the MP3 lecture file, select a medium bitrate like 7.4 kbps to balance compression and legibility, and run the conversion.
Example Config
Bitrate: 7.4 kbps, Channels: Mono (1 channel), Keep Metadata: Enabled
Outcome
The lecture is converted into a lightweight AMR file, reducing the storage footprint by over 80% while keeping the speech fully intelligible.

Try with Samples

audio, file
AMR Narrowband Audio Sample
AMR-NB voice audio sample for telephony playback, upload, and format conversion workflows
title token amr
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 mp3
audio
GSM Audio Sample
GSM encoded audio sample for telephony playback, upload, and format conversion workflows
preferred input family audio
audio
Copyright-Free FLAC Audio Samples
Lossless FLAC audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
preferred input family audio
audio

Related Hubs

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Compare audio format conversion, bitrate changes, sample-rate conversion, codec swaps, and export tools in one hub for delivery and archive workflows.
Audio Editing and Cleanup Tools
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Audio Preview, Tone, and Effect Generator Tools
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Audio Measurement and Inspection Tools
Compare loudness, dynamic range, peak, BPM, key detection, spectral inspection, and metadata review tools in one hub for audio analysis.

FAQ

What is the maximum file size supported for conversion?

You can upload MP3 files up to 20 MB in size.

Why does the converter only output mono audio?

The AMR format is specifically designed for speech and voice applications, which natively use a single (mono) audio channel.

Which AMR bitrate should I choose?

We recommend 12.2 kbps for the best speech quality, but you can choose lower bitrates down to 4.75 kbps if you need extreme compression.

Will my MP3 metadata be preserved?

Yes, if you check the 'Keep Metadata' option, the converter will attempt to preserve tags like title and artist.

Is AMR suitable for music files?

No, AMR is highly optimized for human speech and will significantly degrade the quality of music or complex background audio.

API Documentation

Request Endpoint

POST /en/api/tools/mp3-to-amr

Request Parameters

Parameter Name Type Required Description
audioFile file (Upload required) Yes Upload an MP3 file to convert to AMR
bitrate select No AMR supports various bitrates optimized for different speech quality levels.
channels select No AMR is mono-only for speech applications.
keepMetadata checkbox No -

File type parameters need to be uploaded first via POST /upload/mp3-to-amr 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-mp3-to-amr": {
      "name": "mp3-to-amr",
      "description": "Convert MP3 audio files to AMR (Adaptive Multi-Rate) format",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=mp3-to-amr",
      "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]