Convert Stereo to Mono Online Free

Convert stereo audio to mono online for free. Mix both channels, extract left or right only, swap L/R, or split into two files — all processing happens in your browser.

Convert stereo to mono or split channels into separate files

Process

Mono → Stereo Stereo → Mono

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Drop your stereo audio file here or browse

MP3, WAV, FLAC, OGG, AAC, M4A, WebM — up to 2 GB

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0:00 / 0:00 MIX

Conversion Method

Output Format

Quality

💡 How It Works

Mix L+R combines both stereo channels into one mono channel using equal weighting. This is the standard method — preserves all audio content. Ideal for podcasts, voice recordings, and situations where you need a single-channel file.

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Conversion Complete!

Features

Mix L+R into a single mono channel Extract left or right channel individually Swap left and right channels Split stereo into two separate mono files

How to Convert Stereo to Mono

Upload your stereo audio file by dragging it or clicking "browse".
Choose a method: Mix L+R, Left Only, Right Only, Swap L/R, or Split L/R.
Select your preferred output format (MP3, WAV, FLAC, or OGG).
Click "Convert" and wait for processing to complete.
Download your converted file (or two files for Split L/R).

Frequently Asked Questions

Will converting stereo to mono lose quality?

Mixing L+R to mono combines both channels with equal weighting — no audio content is lost. The resulting file will sound the same on single-speaker devices. If you choose Left Only or Right Only, you keep just that channel's content.

Why convert stereo to mono?

Common reasons: podcasts are typically mono (smaller files, better compatibility), some audio plays in only one ear and needs fixing, or your editor requires mono input. Converting to mono also halves the number of audio samples.

What does Swap L/R do?

Swap exchanges the left and right channels — the output remains stereo. This fixes recordings where the microphones were wired to the wrong inputs, or when the left/right balance feels reversed.

How does Split L/R work?

Split creates two separate mono files — one containing only the left channel audio, the other only the right. Each file is downloaded independently. Useful for separate post-processing of individual channels.

Is my file uploaded to a server?

No. All processing happens locally in your browser using WebAssembly technology. Your audio file never leaves your device.

What formats are supported?

Input: MP3, WAV, FLAC, OGG, AAC, M4A, WebM and more. Output: MP3, WAV, FLAC, OGG. Files up to 2 GB are supported.