Mono to Stereo and Stereo to Mono Converter
Switch an audio file between mono and stereo right in your browser. Drop in a file and the tool shows how many channels it has, then convert with one click: To mono averages every channel into a single one, and To stereo duplicates a mono track into matching left and right channels (or keeps the first two of a wider file). Download the result as a WAV. The file never leaves your device.
How to convert between mono and stereo
- Drop an audio file in, or click to browse.
- See the current channel count, then click To mono or To stereo.
- Click Download to save the converted WAV file.
Examples
Downmix a stereo recording to mono
A 2-channel voice memo
A single-channel WAV with the two channels averaged together
Make a mono clip stereo
A 1-channel sound effect
A 2-channel WAV with identical left and right channels
Frequently asked questions
Is my audio uploaded anywhere?
No. The file is decoded and converted entirely in your browser. Nothing is uploaded to any server, so it works offline once the page has loaded.
How does stereo to mono work?
Every channel is averaged together at each moment in time, so the left and right channels are combined into one. This keeps both sides audible rather than discarding one.
How does mono to stereo work?
A single channel is copied into identical left and right channels. The result sounds the same as the mono original but is stored as a two-channel file that stereo players expect.
What if my file has more than two channels?
To mono averages all of them into one. To stereo keeps the first two channels. The original file is never changed; you download a new WAV.
What format is the download?
A 16-bit PCM WAV file at the original sample rate. WAV is uncompressed and plays everywhere, so converting channels does not lose quality.
Related tools
Audio Speed Changer
Speed up or slow down an audio file in your browser, from half speed to 2x. Download the result as a WAV. Free, fast, and nothing is uploaded.
Audio Silence Remover
Trim silence from the start and end of an audio file in your browser. Set the threshold and padding, then download a WAV. Free, private, nothing uploaded.
Audio Waveform Generator
Turn an audio file into a waveform image in your browser. Pick colors and size, then download a PNG. Free, private, and nothing is uploaded.
Audio Fade
Add a fade-in or fade-out to audio in your browser. Pick the fade length and a linear or equal-power curve, then download a WAV. Nothing is uploaded.
Audio Reverser
Reverse audio in your browser and play any clip backwards. Drop in a file, hear the reversed preview, then download it as a WAV. Nothing is uploaded.
Audio Transcriber
Transcribe audio to text in your browser with OpenAI's Whisper AI. Get timestamps, export SRT, VTT or TXT, pick a quality level. Nothing is uploaded.