Do I need to install anything to use this tool?

This tool generates FFmpeg commands — it does not run them. You need FFmpeg installed on your computer. Download it free from ffmpeg.org. On macOS you can install it via Homebrew: brew install ffmpeg. On Windows, download the pre-built binary from gyan.dev.

Will converting WMA to M4A reduce audio quality?

Any conversion between lossy formats (WMA and AAC are both lossy) involves some generation loss. At 192 kbps or higher the difference is inaudible to most listeners. If the original WMA is high bitrate (256+ kbps), use at least 192 kbps AAC to preserve quality.

What is the difference between M4A and AAC?

AAC is the audio codec (compression algorithm). M4A is the file container (extension) that holds AAC audio inside an MPEG-4 wrapper. The terms are often used interchangeably — an M4A file contains AAC audio.

Can I convert multiple WMA files at once?

Yes. On Linux/macOS, use a shell loop: for f in *.wma; do ffmpeg -i "$f" -c:a aac -b:a 192k "${f%.wma}.m4a"; done. On Windows PowerShell: Get-ChildItem *.wma | ForEach-Object { ffmpeg -i $_.Name -c:a aac -b:a 192k ($_.BaseName + ".m4a") }

Why does FFmpeg show a "No such file" error?

The terminal must be in the same directory as your WMA file, or you must provide the full path. For example: ffmpeg -i "C:\Music\song.wma" -c:a aac -b:a 192k "C:\Music\song.m4a"

Is VBR (variable bitrate) better than CBR for M4A?

VBR (-q:a flag) generally produces smaller files at equivalent perceptual quality because it allocates more bits to complex passages and fewer to silence. CBR is preferable for streaming or when file size must be exactly predictable.

WMA to M4A Converter

Name: WMA to M4A Converter
Availability: InStock
Author: Nham Vu

Build an FFmpeg command to convert WMA audio to M4A/AAC — set your options and copy the command.

Conversion Options

Input filename

Include the path if the file is not in the current directory.

Output filename

Bitrate mode

Fixed (CBR) Variable (VBR)

Audio bitrate

Sample rate

Channels

Overwrite output if it already exists (-y)

FFmpeg Command

ffmpeg -i song.wma -c:a aac -b:a 192k song.m4a

Command Explained

Quick Reference

Batch convert (Linux / macOS)

for f in *.wma; do ffmpeg -i "$f" -c:a aac -b:a 192k "${f%.wma}.m4a"; done

Batch convert (Windows PowerShell)

Get-ChildItem *.wma | ForEach-Object { ffmpeg -i $_.Name -c:a aac -b:a 192k ($_.BaseName + ".m4a") }

Need FFmpeg? Download free at ffmpeg.org/download.html

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Summary

Build an FFmpeg command to convert WMA audio to M4A/AAC — set your options and copy the command.

How it works

Enter your input filename (e.g. song.wma) and desired output filename (e.g. song.m4a).
Choose the AAC audio bitrate — 128 kbps is fine for speech, 192–256 kbps for music.
Select sample rate and channel layout (stereo is standard for music).
Optionally enable highest-quality AAC encoding with the -q:a flag instead of a fixed bitrate.
Click "Generate Command" to build the FFmpeg command.
Copy the command and run it in your terminal (Windows Command Prompt, macOS Terminal, or Linux shell).

Use cases

Convert old WMA music files for playback on iPhone, iPad, or Apple devices.
Prepare audio files for upload to iTunes, Apple Music, or podcast platforms.
Reduce WMA file sizes by re-encoding at a lower AAC bitrate.
Batch-convert an entire WMA library to M4A using a shell loop with the generated command as the template.
Convert WMA recordings to M4A before importing into GarageBand or Logic Pro.
Make WMA audiobooks compatible with Apple Books or Audible-compatible players.
Archive WMA files to a more future-proof and widely supported format.
Convert WMA to M4A without losing quality using a high-bitrate AAC setting.

Frequently Asked Questions

Last updated: 2026-07-01 · Reviewed by Nham Vu