Audio · Audio

Stereo to Mono

Downmix supported audio files to one mono channel in the browser.

Processed locally

FFmpeg loads only when processing starts

Stereo To Mono

Drop an audio file here. V1 limit: 50 MB.

Files are processed in your browser with FFmpeg WASM. The selected file is not uploaded to Tool2Do, but FFmpeg core code is downloaded on demand for this tool.

Share this tool

Share the page, not your private inputs.

How to use this audio tool

Downmix supported audio files to one mono channel in the browser.

How the audio logic works

Choose an audio file.
FFmpeg downmixes it to mono.
Download the WAV output.

Formula

FFmpeg uses one output audio channel with -ac 1.

Example

Convert a stereo voice recording to mono for editing.

Using the audio result

Use the output as a practical starting point, then review it before using it in an important workflow.

Assumptions and limitations

File size will not always be exactly halved.
The output is WAV in this V1.

Frequently asked questions

Does this require an account?

No. The core tool works without creating a Tool2Do account.

Is my input included in share links or analytics?

No. Tool2Do share actions use the tool page URL and safe metadata, not private values or uploaded files.