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First run downloads FFmpeg (~25 MB) once in this browser. Conversion runs locally — no server upload.

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MP3 to M4A converter online free

Convert MP3 to M4A online free. Change MP3 to M4A or MP4A with selectable AAC bitrate — browser-based M4A format converter, no server upload.

What is an MP3 to M4A converter?

An MP3 to M4A converter (also searched as mp3 to mp4a or M4A format converter) re-encodes MP3 audio into Apple-friendly M4A (AAC in an MP4 container). Use it to convert MP3 to M4A format for iTunes, iPhone, or apps that prefer .m4a files. This free tool runs locally with FFmpeg WebAssembly — no server upload.

MP3 to M4A converter features

Free online MP3 to M4A and MP3 to MP4A converter in the browser.

  • Convert MP3 to M4A online

    Upload an MP3 file and download M4A output with no software install.

  • MP3 to MP4A support

    Outputs standard .m4a files — the same format people often call mp4a.

  • M4A format converter

    Change MP3 to M4A format for Apple devices and modern audio apps.

  • Selectable AAC bitrate

    Choose 96 to 320 kbps depending on quality and file size needs.

  • No server upload

    All conversion runs locally with FFmpeg WebAssembly for privacy.

  • Simple download flow

    Download the M4A output immediately after conversion completes.

How to convert MP3 to M4A

How to convert MP3 to M4A format online in three steps.

  1. Upload MP3 file

    Drop your .mp3 audio file (up to 200 MB).

  2. Choose AAC bitrate

    Pick 128 kbps for balance or 192/320 kbps for higher audio quality.

  3. Convert and download

    Click Convert to M4A, then save the .m4a file.

Great for

Common MP3 to M4A conversion scenarios.

  • Apple and iTunes libraries

    Convert MP3 tracks to M4A for iPhone, iPad, and Mac playback.

  • Apps that prefer M4A

    Switch MP3 to M4A format when an editor or device expects .m4a.

  • Modern AAC encoding

    Re-encode MP3 into AAC inside an M4A container at your chosen bitrate.

  • Smaller high-quality files

    AAC in M4A can match MP3 quality at similar or smaller file sizes.

Frequently Asked Questions

Quick answers about this tool—open a question to read more.