MP3 to AMR Converter – Convert MP3 Audio to AMR Online Free

Upload MP3 Files

Drag & drop MP3 files here or click to browse

Supported formats: MP3, M4A, WAV, FLAC

About MP3 to AMR Converter

Our MP3 to AMR Converter allows you to upload one or multiple MP3 audio files and convert them into AMR format directly in your browser. This tool is designed for fast, secure, and optimized audio conversion using AMR-NB (Adaptive Multi-Rate Narrowband) settings.

You can upload MP3 files, convert them in batch, and download individual AMR files or all converted files as a ZIP archive.

What This Tool Does

This tool converts MP3 audio files into AMR format using fixed AMR-NB conversion settings optimized for speech and voice recordings.

The process includes:

  • Uploading MP3 files

  • Converting them to AMR-NB format

  • Generating optimized output files

  • Providing download options (single or ZIP)

What Is AMR Format?

AMR (Adaptive Multi-Rate) is an audio format designed primarily for speech compression.

This tool converts files using AMR-NB (Narrowband) settings, which include:

  • Codec: AMR-NB (libopencore_amrnb)

  • Sample Rate: 8000 Hz

  • Channels: Mono

  • Bitrate: 12.2 kbps

  • Optimized for voice clarity

AMR-NB is commonly used for mobile voice recordings and telephony applications.

Supported Input Format

This converter accepts:

✔ MP3 (.mp3) files only

Files that are not MP3 will be rejected automatically by the system.

Key Features

✔ Multi-File Upload

Upload and convert multiple MP3 files in one session.

✔ Drag & Drop Support

Drag files into the upload area or browse manually.

✔ Batch Conversion

Convert all uploaded files in a single click.

✔ Optimized AMR-NB Output

Every file is converted using fixed, optimized AMR settings.

✔ Download Options

  • Download single AMR file

  • Download multiple files as ZIP

✔ Session-Based File Handling

Your files are tracked using a unique session ID.

✔ Automatic File Cleanup

All uploaded and converted files are automatically deleted after approximately one hour.

✔ Individual File Removal

Remove a file before or after conversion.

✔ Clear All Files

Delete all files in your session instantly.

How to Use the MP3 to AMR Converter

Follow these simple steps:

Step 1: Upload Your MP3 Files

  • Drag & drop MP3 files into the upload box
    OR

  • Click Select Files and choose your MP3 files

Only .mp3 files are accepted.

After uploading, your files will appear in a list with file name and file size.

Step 2: Convert to AMR

Click the Convert to AMR button.

The system will:

  1. Read your uploaded MP3 file

  2. Convert it to AMR-NB format

  3. Apply:

    • 8000 Hz sample rate

    • Mono channel

    • 12.2 kbps bitrate

  4. Generate a new .amr file

Once conversion is complete, the results section will appear.

Step 3: Review Converted Files

Each converted file displays:

  • File name (.amr)

  • File size

  • Duration

  • Format: AMR

  • Codec: AMR-NB

  • Quality: Optimized (12.2 kbps)

If any file fails to convert, an error message will appear next to it.

Step 4: Download Your Files

You have two download options:

Download Single File

Click the Download button next to the file.

The file will be downloaded with the original file name but with .amr extension.

Example:

voice.mp3 → voice.amr

Download Multiple Files

If you converted multiple files:

Click Download Audio

  • One file → downloads directly

  • Multiple files → downloads a ZIP file:

    
 

    converted_amr_files.zip

Remove or Clear Files

Remove Individual File

Click the ❌ icon next to an uploaded file to delete it.

Clear All Files

Click Clear to delete all uploaded and converted files from your session.

This also resets your session ID.

Temporary Storage & Auto Cleanup

For performance and security:

  • Uploaded MP3 files are stored temporarily.

  • Converted AMR files are stored temporarily.

  • Files older than approximately 1 hour are automatically deleted.

If you try to download after cleanup, you may need to re-upload and convert again.

Technical Conversion Settings Used

Every MP3 is converted using these fixed settings:

Setting Value
Codec                            libopencore_amrnb                
Format AMR-NB
Sample Rate 8000 Hz
Channels Mono
Bitrate 12.2 kbps

These settings are optimized for speech clarity and compact file size.

Why Convert MP3 to AMR?

AMR is useful when:

  • You need speech-optimized compression

  • You want smaller audio file size

  • You need compatibility with AMR-based systems

  • You want mono voice output at 8000 Hz

MP3 to AMR Converter FAQs

Common questions about converting MP3 audio files to AMR format online.

The backend strictly validates file extensions and allows only .mp3 files. This ensures stable conversion and avoids unsupported audio formats.

AMR-NB format supports mono audio only, and the conversion pipeline forces a single audio channel to comply with AMR-NB specifications.

AMR-NB requires an 8000 Hz sample rate. This setting is mandatory for compatibility with AMR-NB codecs and speech-based audio systems.

No. The bitrate is fixed at 12.2 kbps, which is the highest standard bitrate for AMR-NB and is hard-coded in the conversion process.

Uploaded MP3 files remain temporarily stored. If no conversion is done, they are automatically deleted by the cleanup system after approximately one hour.

This happens if:

  • The file was automatically cleaned up

  • The session expired

  • The file was manually deleted earlier

In this case, the file must be uploaded again.

If the page refreshes but the session is still active and files have not been cleaned up, downloads may still work. Otherwise, files must be re-uploaded.

When more than one AMR file is available, the tool automatically packages them into a ZIP file for easier downloading.

No. Files are stored temporarily only and are automatically removed after a set time to protect storage and privacy.

Related Tools

Popular Tools