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Mid/Side Decode

Decode a Mid/Side file back into a stereo file

Decodes Mid/Side audio back to conventional stereo. Assumes the Mid signal is on the left channel and the Side signal on the right. You can fine-tune Mid and Side contribution to control stereo width while reconstructing the left and right channels.

Click to upload file or drag and drop file here

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

0 1 2

Scaling applied to Mid when rebuilding stereo.

0 1 2

Scaling applied to Side (controls width).

Key Facts

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

Overview

The Mid/Side Decode tool converts Mid/Side encoded audio files back into standard stereo format. It allows you to adjust the Mid and Side levels to fine-tune the stereo width during reconstruction.

When to Use

  • •When you have an audio file recorded in Mid/Side format and need to convert it to stereo.
  • •When you want to control the stereo width by adjusting the balance between Mid and Side signals.
  • •During audio mastering or mixing to reconstruct conventional stereo from Mid/Side encoding.

How It Works

  • •Upload a Mid/Side encoded audio file where the Mid signal is on the left channel and the Side signal on the right.
  • •Use the Mid Level and Side Level sliders to adjust the contribution of each signal, controlling the stereo width.
  • •Select your preferred output format from options like WAV, MP3, or FLAC.
  • •The tool decodes the audio and generates a stereo file for download.

Use Cases

Converting Mid/Side field recordings to stereo for post-production editing.
Adjusting stereo width in music mastering to enhance spatial perception.
Decoding Mid/Side audio for playback on standard stereo systems.

Examples

1. Field Recording Conversion

Sound Designer
Background
Captured environmental audio with a Mid/Side microphone during a film shoot.
Problem
The recorded file is in Mid/Side format and needs to be converted to stereo for use in the film's audio mix.
How to Use
Upload the audio file, leave Mid Level and Side Level at default (1.0), and select WAV as the output format.
Outcome
A stereo WAV file that can be imported into the audio editing software.

2. Stereo Width Adjustment in Mastering

Mastering Engineer
Background
Working on a music track that was recorded with Mid/Side technique for better control over stereo image.
Problem
Need to decode the Mid/Side file and adjust the width to fit the desired soundstage.
How to Use
Upload the file, increase Side Level to 1.5 for a wider stereo effect, and output in FLAC format.
Outcome
A FLAC file with enhanced stereo width, ready for final mastering.

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
preferred input family audio
audio
WebRTC Real-Time Communication Samples
Comprehensive WebRTC samples for peer-to-peer audio/video communication, data channels, screen sharing, and signaling server implementation
preferred input family 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
preferred input family 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
preferred input family audio
audio

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FAQ

What is Mid/Side encoding?

Mid/Side encoding is a technique where audio is recorded with a Mid (center) signal and a Side (stereo difference) signal, often used in microphone setups.

How do I use the Mid Level and Side Level controls?

Adjust the sliders to scale the Mid and Side signals. Increasing Side Level widens the stereo image, while decreasing it narrows it.

What audio formats can I upload?

You can upload any audio file format supported by your browser, such as WAV, MP3, or AAC.

What output formats are available?

The tool supports output in MP3, AAC, M4A, OGG Vorbis, Opus, FLAC, and WAV formats.

Is there a limit on file size?

Yes, the maximum file size is 200 MB.

API Documentation

Request Endpoint

POST /en/api/tools/audio-mid-side-decode

Request Parameters

Parameter Name Type Required Description
audioFile file (Upload required) Yes -
midLevel range No Scaling applied to Mid when rebuilding stereo.
sideLevel range No Scaling applied to Side (controls width).
outputFormat select No -

File type parameters need to be uploaded first via POST /upload/audio-mid-side-decode 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-mid-side-decode": {
      "name": "audio-mid-side-decode",
      "description": "Decode a Mid/Side file back into a stereo file",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=audio-mid-side-decode",
      "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]