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Audio Join Stereo

Join two mono tracks into a single stereo file

Click to upload file or drag and drop file here

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

Click to upload file or drag and drop file here

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

Key Facts

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

Overview

This tool combines two separate mono audio tracks into a single stereo file, enabling balanced left-right audio output for various applications.

When to Use

  • •When you have recorded left and right audio channels separately and need to merge them into stereo.
  • •For audio post-production to create spatial sound from mono sources.
  • •To fix split audio files by combining channels for proper stereo playback.

How It Works

  • •Upload your left channel mono audio file using the designated input.
  • •Upload your right channel mono audio file using the second input.
  • •The tool processes both files and generates a single stereo audio file.
  • •Download the resulting stereo file for use in your projects.

Use Cases

Podcast editing where hosts are recorded on separate microphones, requiring stereo merging.
Music production to combine instrument or vocal tracks into a cohesive stereo mix.
Video soundtracks where audio channels need to be synchronized and merged for immersive playback.

Examples

1. Merging Podcast Host Audio

Podcast Producer
Background
A podcast episode was recorded with two hosts using separate microphones, resulting in two mono audio files.
Problem
The audio needs to be combined into a stereo file to ensure balanced sound for listeners.
How to Use
Upload the left channel file for one host and the right channel file for the other host.
Outcome
A single stereo audio file is generated, with each host clearly audible in their respective channels for a professional listening experience.

2. Creating a Stereo Music Demo

Background
A musician has recorded guitar and vocals on separate mono tracks during a home studio session.
Problem
To mix these tracks into a stereo file for sharing or further production.
How to Use
Select the guitar track as the left channel and the vocals track as the right channel.
Outcome
A stereo music file is produced, enhancing the spatial audio quality and making the demo more engaging.

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

What audio file formats are supported?

The tool accepts common audio formats like MP3, WAV, and others, as specified by the file input constraints.

Can I use the same audio file for both channels?

No, you must provide two distinct mono files—one for the left channel and one for the right channel.

Is there a limit on file size?

Yes, each audio file is limited to 200 MB, as indicated in the tool's specifications.

What is the output format of the stereo file?

The output is a stereo audio file in a format compatible with the input, such as MP3 or WAV.

Do I need to install any software to use this tool?

No, this is a web-based tool that operates directly in your browser without additional installations.

API Documentation

Request Endpoint

POST /en/api/tools/audio-join-stereo

Request Parameters

Parameter Name Type Required Description
leftChannel file (Upload required) Yes -
rightChannel file (Upload required) Yes -

File type parameters need to be uploaded first via POST /upload/audio-join-stereo 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-join-stereo": {
      "name": "audio-join-stereo",
      "description": "Join two mono tracks into a single stereo file",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=audio-join-stereo",
      "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]