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convertexa

M4A → AAC

M4A to AAC converter

convertexa converts M4A files to AAC locally in your browser using a dedicated ffmpeg engine. Nothing is uploaded: the file is read, converted and handed straight back to you as a download.

  • Free, no sign-up
  • Nothing is uploaded
  • Works offline
Quality
Re-encoded
Runs
In your browser
Max input
300 MB
Status
stable

Drop a file to convert

Everything happens on your device — nothing is uploaded.

or paste with Ctrl+V

How to convert M4A to AAC

  1. 1 Drop your M4A file here.
  2. 2 Choose AAC as the output format and adjust the options.
  3. 3 Convert and download the result.

About M4A and AAC

M4A is an AAC stream inside an MP4 container.

AAC is the audio codec used by most streaming services.

M4A files are read by the convertexa engine that ships with this page, so the conversion is identical whether you use this tool or the general converter. The output is produced with the same codec settings for every visitor, which means the same input always produces the same result.

Limitations

  • The conversion runs in your browser, so very large files can exhaust the memory available to the tab.

Frequently asked questions

How do I convert a M4A file to AAC?

Add your M4A file to the box above. convertexa detects the format from the file content, applies the M4A to AAC conversion and gives you the result to download. The whole operation runs inside your browser.

Are my M4A files uploaded anywhere?

No. The conversion runs in a sandboxed worker on your own device. Your file never leaves the browser, and nothing is stored on a server.

Is the M4A to AAC conversion lossless?

No. AAC is a re-encoded format, so some data is discarded to reach the target format. M4A is an AAC stream inside an MP4 container.

Is there a size limit?

For reliable results keep the input under 300 MB. Very large files run out of memory in the browser rather than failing quietly.

Which browsers are supported?

Any current version of Chrome, Edge, Firefox or Safari on a desktop. The conversion engines need WebAssembly and Web Workers, both of which are standard since 2018.