AAC to M4A Converter

AAC to M4A Converter | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Media
Input types: file, select, checkbox
Output type: file
Sample coverage: 4
API ready: Yes

Overview

Convert an AAC audio file to M4A with selectable bitrate, sample rate, channel count, and optional metadata preservation.

When to use

You need an M4A version of an AAC audio file.
You want to adjust output quality with a selected bitrate or sample rate.
You need to keep the original channel layout or convert the output to mono or stereo.

How it works

1Upload one AAC audio file in a supported AAC format.
2Choose a target bitrate, sample rate, and channel count, or keep the original settings with Auto.
3Enable or disable metadata preservation when available.
4Start the conversion and download the resulting M4A file.

Use cases

Create an M4A copy of an AAC recording for an audio library.
Reduce or increase the target bitrate for a specific output quality.
Convert stereo AAC audio to mono or set a defined sample rate for the M4A output.

Examples

1. Convert a voice recording to M4A

Podcast editor

Background

A podcast editor has an AAC voice recording and needs an M4A copy while retaining available title and artist tags.

Problem

The source file is in AAC format, but the required delivery file is M4A.

How to use

Upload the AAC recording, leave the bitrate at 192 kbps, keep the sample rate and channels set to Auto, and leave metadata preservation enabled.

Outcome

The tool produces an M4A version using the original sample rate and channel settings when available, with metadata preserved when available.

2. Create a smaller mono M4A file

Audio archivist

Background

An archivist wants a more compact M4A copy of a spoken-word AAC recording.

Problem

The recording does not need stereo output, and a lower bitrate is preferred.

How to use

Upload the AAC file, select 96 kbps, choose Mono (1 channel), and keep the sample rate on Auto.

Bitrate: 96 kbps; Sample Rate: Auto; Audio Channels: Mono (1 channel); Keep Metadata: enabled

FAQ

What input files does this converter accept?

It accepts one AAC audio file, including supported AAC audio MIME types and .aac files.

What format is the output?

The converter creates an M4A file using the MPEG-4 Audio format.

Can I choose the M4A bitrate?

Yes. Available bitrate options range from 64 kbps to 320 kbps, with 192 kbps selected by default.

Can I change the audio channels?

Yes. You can keep the original channel count, convert to mono, or convert to stereo.

Will metadata be preserved?

Metadata preservation is enabled by default when title or artist tags are available.

3. Set a fixed sample rate for M4A output

Audio technician

Background

An audio technician needs an M4A copy of an AAC file with a defined 48 kHz sample rate.

Problem

Keeping the source sample rate unchanged would not meet the target specification.

How to use

Upload the AAC file, select the required bitrate, choose 48 kHz for Sample Rate, and keep the channel setting on Auto.

Bitrate: 256 kbps; Sample Rate: 48 kHz; Audio Channels: Auto; Keep Metadata: enabled

Outcome

The tool returns an M4A file configured with a 256 kbps bitrate and 48 kHz sample rate.

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Inputs

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Convert a voice recording to M4A

2. Create a smaller mono M4A file

FAQ

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3. Set a fixed sample rate for M4A output