# Audio Join Stereo

Join two mono tracks into a single stereo file

> Canonical page: https://elysiatools.com/en/tools/audio-join-stereo

- **Category:** Media

- **Keywords:** audio, stereo, mono, amerge

## Overview

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

## Inputs

- **Left Channel (mono)** (file): Select left channel audio
- **Right Channel (mono)** (file): Select right channel audio

## 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.

## Frequently asked questions

### 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.

## Related tools

- [Backing Vocal Width Expander](https://elysiatools.com/en/tools/audio-backing-vocal-width): Turn a single vocal into a wide stereo harmony stack of 3, 5, or 7 transposed voices panned across the field.
- [Extract Center Channel](https://elysiatools.com/en/tools/audio-center-channel-extract): Extract the center channel from a surround audio file or video audio track
- [Audio Channel Mixer](https://elysiatools.com/en/tools/audio-channel-mix): Mix left and right channels into mono with specific ratios
- [Audio Extract Segment](https://elysiatools.com/en/tools/audio-extract-segment): Extract a single segment from an audio file
- [Audio Join 5.1](https://elysiatools.com/en/tools/audio-join-5-1): Join six mono tracks into a 5.1 surround file
- [Extract Left Channel](https://elysiatools.com/en/tools/audio-left-channel-extract): Extract only the left channel to a mono file
- [Mid/Side Decode](https://elysiatools.com/en/tools/audio-mid-side-decode): Decode a Mid/Side file back into a stereo file
- [Mid/Side Encode](https://elysiatools.com/en/tools/audio-mid-side-encode): Encode a stereo file into Mid/Side channels

## Samples

- [Copyright-Free FLAC Audio Samples](https://elysiatools.com/en/samples/flac-samples): Lossless FLAC audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
- [Copyright-Free MP3 Audio Samples](https://elysiatools.com/en/samples/mp3-samples): Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio
- [Copyright-Free WAV Audio Samples](https://elysiatools.com/en/samples/wav-samples): Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
- [Copyright-Free Raw PCM Audio Samples](https://elysiatools.com/en/samples/pcm-samples): Raw PCM s16le audio samples featuring nature ambience and relaxing music for waveform, playback, and conversion workflows

## Related content

- [Audio Channel Routing and Delivery Verification](https://elysiatools.com/en/hubs/audio-channel-routing): Route, split, join, and convert mono or stereo audio while preserving left/right intent and checking the final file before delivery.