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Convert mono and stereo audio

Convert audio to mono or stereo. Processing stays local in the browser.

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How does this tool work?

Convert a track to mono or stereo to match the channel count required by your processing chain. The engine re-encodes the result locally as PCM WAV.

FFmpeg/WASM sets the output channel count to 1 for mono or 2 for stereo. Stereo-to-mono combines channels according to the engine’s downmix. Mono-to-stereo duplicates the content into a two-channel output; it cannot recreate a stereo scene that was not present in the source. This page starts in mono mode. Combining stereo channels can cancel sounds that have opposite phase, so check the result through headphones and a speaker. Converting mono to stereo fills two channels from one source; it cannot separate instruments or speakers. This control does not set the sample rate: use resampling for that operation. Output is 16-bit PCM WAV. Artwork and tags are not guaranteed, and a channel conversion is not a substitute for keeping your original recording.

How to use this tool

  1. Import the file

    Choose a supported audio file.

  2. Choose mono or stereo

    Select 1 or 2 output channels.

  3. Download the WAV

    The file is re-encoded locally with the selected channel count.

Convert mono and stereo audio — Calculation reference

S = t × f × C × b / 8

S
PCM payload in bytes, excluding headers
t
Duration in seconds
f
Sample rate in Hz
C
Channel count, dimensionless
b
Bits per sample

Use cases

Mono voice

Reduce a spoken-word stereo recording to one channel when spatial information adds no value.

Compatibility

Standardize channel count before another transformation or export.

Consistent pipeline

Prepare multiple files with the same mono or stereo configuration.

Examples

One minute of mono speech

60 × 48,000 × 2 bytes. The sample rate is an explicit calculation assumption rather than a setting on this page. Add the WAV header.

Input

60 s, 48,000 Hz, 16-bit PCM, 1 channel

Result

5,760,000 PCM bytes

The same take in stereo

Two channels double the payload without promising two independent sound sources. Container headers add a small overhead.

Input

60 s, 48,000 Hz, 16-bit PCM, 2 channels

Result

11,520,000 PCM bytes

Tips and best practices

  • Converting mono to stereo does not create new spatial information.
  • Converting stereo to mono can change balance when the two channels contain very different signals.
  • To extract left and right separately, use the channel splitter.

Sources and references

Frequently asked questions

Does mono-to-stereo improve spatialization?

No. The mono signal is placed in a two-channel output without recreating an original stereo scene.

Does this operation change the format?

This transform currently produces PCM WAV.

Can I isolate left and right with this tool?

No. Use the channel splitter to generate two separate mono files.

Why do some sounds disappear after conversion to mono?

Combining channels can cancel signals with opposite phase. There is no automatic phase correction here; compare the mono result with the stereo source before using it.

Does mono make the file half the size?

At the same duration, sample rate and PCM resolution, one channel holds half the data of two. Headers and the source file’s compression prevent applying that ratio to every complete file.

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