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Stereo to mono

A stereo to mono converter: the left and the right channel are mixed into one. That is enough for speech, a recording with sound on one side only then plays on both, and a mono WAV is half the size. You can change the sample rate in the same step. Nothing is uploaded: your browser does the work.

How to convert stereo to mono

  1. 1Drop an audio file in, or click to choose one
  2. 2Check "Channels": it is already set to "Mono (one channel)"
  3. 3Pick a sample rate and a format if you want to change those too
  4. 4Click "Convert" and save the result
  5. One channel instead of two, saved to your device

What happens to your files

  • Nothing is uploaded.Your file is read and processed by your browser, on your own device
  • Left and right, averaged.Mono is the average of the two channels, so the sound of both sides is in it
  • Half the size as WAV.A mono WAV is half as large as the same recording in stereo

What you can do

  • Mix a stereo file down to one channel. The tool opens with "Channels" set to "Mono (one channel)"
  • Change the sample rate in the same run: 8, 16, 22.05, 32, 44.1 or 48 kHz, or leave it as it is
  • Read the plan before you start: from which channels and sample rate to which, and the format the file is saved in
  • Save in the format the file already has, or as MP3, M4A (AAC), WAV or OGG (Opus)
  • Open MP3, WAV, M4A, AAC, OGG, OPUS, FLAC and WebM files, and the sound of MP4, MOV and MKV videos

Good to know

  • A mono MP3 or M4A needs about half the bitrate for the same quality. "Same as the original" keeps the bitrate the file had, so the file does not shrink by itself. For a smaller file use Compress audio file
  • Mono is the average of left and right. A recording that had sound on one side only therefore comes out quieter. Change volume makes it louder again
  • If the file is already mono and you change nothing else, the tool says so and does nothing
  • The sound is decoded and encoded again. A FLAC is saved as WAV, which is lossless too. OGG (Opus) is always written at 48 kHz
  • It works best in desktop Chrome or Edge

Questions

How do I convert a stereo MP3 to mono?

Drop the MP3 in and click "Convert". "Channels" is already on "Mono (one channel)". The mono MP3 is saved to your device.

Does mono make the file smaller?

A WAV, yes: half the size. An MP3 or M4A is as large as its bitrate makes it, and "Same as the original" keeps that bitrate. Mono needs only about half of it for the same quality, so you can go lower with Compress audio file.

Do I lose anything when I go from stereo to mono?

The sound of both channels stays, but where it sat between left and right is gone. For speech, such as a podcast, a lecture or a dictation, that rarely matters.

Can I turn the mono file back into stereo later?

Mono to stereo puts the same sound on both channels, for players and editors that expect stereo. The old difference between left and right does not come back, so keep the original if you may need it.

Is my audio file uploaded?

No. Nothing is uploaded. The file is read and processed by your browser, on your own device.

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How it works

Small tools that run in your browser.

What runs where

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A tool your browser has kept also works without internet. Under Offline, at the bottom of this page, you can save everything at once, and the site keeps working without a connection.

Some tools have AI built in, for example to remove a background or enlarge a photo. Your browser downloads their AI models once, from ToolRecipe itself, and then runs them on your device. No tool sends your files to an online AI service or to us.

On a computer, these tools use the graphics chip when it passes a short check, because that is usually faster. On a phone they run on the processor, with settings that fit in a phone’s memory.

Using a tool

Give the tool your file, choose what you want, save the result.

  • Start on the home page

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  • Choose the settings

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Chaining tools

What one tool makes can go straight into the next, without saving it and opening it again.

  • “Use it in”

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  • Drag it

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  • From a chain to a recipe

    To run the same tools again later, make a recipe of them in the recipe builder.

The recipe builder

Drop a file in the box on the home page and add the steps one at a time. Nothing runs until you press “Run recipe” or “Open tool”.

  • Pick what to do

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  • Steps that need you

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  • Save or start over

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Recipes

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  • Ready-made recipes

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  • My recipes

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  • Share a recipe

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Ways of working

Tools and recipes run in your browser, on your device.

  • Start from a file

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  • Start from a tool

    Search for the job or open a tool from the menu. When the result is ready, tap it in Results and pick the next tool under “Use it in”.

  • Keep the steps

    A saved recipe keeps its name, its tools in order and the setting of each step. It never keeps your files or their names.

  • Come back later

    Open My recipes in the same browser, on the same device, and run a recipe on a new file. A recipe stays there until you delete it or clear your browser data.

Finding tools again

Every tool and every recipe has its own address.

  • Bookmark it

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  • On your home screen

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  • Your own recipes

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  • The stars

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Who uses what

Tool sets for common jobs.

Put a tool on your home screen

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iPhone and iPad

  1. Open the tool in Safari
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Android

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  2. Tap the menu (⋮) at the top right
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Computer

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  2. Click the install icon in the address bar
  3. Choose Install

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