Convert Mono to Stereo Online

An audio converter that transforms mono recordings into stereo with adjustable width and channel separation. Supports all popular audio formats — processed entirely in your browser.

How to Convert Mono to Stereo

1

Upload your mono audio file by dragging it into the upload zone or clicking "browse".

2

Choose a conversion method: Duplicate (recommended), Pseudo-Stereo, Pan Left, or Pan Right.

3

Select your preferred output format (MP3, WAV, FLAC, or OGG).

4

Click "Convert to Stereo" and wait for processing to complete.

5

Download your new stereo file.

Turn mono recordings into stereo files with one click

Drop your mono audio file here or browse
MP4, WEBM, MOV, MP3, WAV, M4A, OGG, FLAC, AAC, M4B, WMA, AIFF, OPUS, CAF, MKV, AVI, WMV, FLV, M4V, 3GP, TS, MTS, M2TS, VOB, MPG, MPEG, OGV ·
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Conversion Method
Output Format
💡 How It Works
Duplicate copies the mono signal identically to both L and R channels. The result sounds the same as mono but is stored as a 2-channel stereo file — compatible with all players and editors that require stereo input.
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Features

Duplicate mono to both L/R channels for stereo compatibility
Creates an identical-sounding 2-channel file for editors and platforms that require stereo input.
Pseudo-stereo effect with subtle delay for perceived width
Adds a slight delay and reverb to one channel so a single mono source sounds less flat on headphones.
Pan mono to left or right channel individually
Place the signal fully in one ear to build a custom stereo mix from several separate mono sources.

Frequently Asked Questions

What is the difference between mono and stereo?

Mono audio has one channel — the same sound plays from all speakers. Stereo has two channels (left and right) that can carry different audio, creating a sense of spatial depth and direction.

Will Duplicate make my audio sound different?

No. Duplicate copies the same mono signal to both channels — it sounds identical. The purpose is to create a stereo file format that is compatible with editors and platforms that require 2-channel input.

What does Pseudo-Stereo do?

Pseudo-stereo adds a slight delay and echo to one channel, creating a perception of width and space. It makes mono recordings sound less "flat" when listening on headphones or stereo speakers.

Why would I pan mono to only the left or right?

This is useful when building a stereo mix from multiple mono sources. You can pan different instruments to different positions in the stereo field, then merge them in an audio editor.

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.

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Comments

Jos 2 weeks ago

Very easy en good!

Who is this tool for?
🎵 Musicians & Producers 🎙️ Podcasters 🎛️ Sound Engineers 🎧 Audiophiles
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