MP3 → M4A
MP3 to M4A converter
convertexa converts MP3 files to M4A 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 MP3 to M4A
- 1 Drop your MP3 file here.
- 2 Choose M4A as the output format and adjust the options.
- 3 Convert and download the result.
About MP3 and M4A
MP3 is the most compatible audio format, at the cost of some quality.
M4A is an AAC stream inside an MP4 container.
MP3 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 MP3 file to M4A?
Add your MP3 file to the box above. convertexa detects the format from the file content, applies the MP3 to M4A conversion and gives you the result to download. The whole operation runs inside your browser.
Are my MP3 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 MP3 to M4A conversion lossless?
No. M4A is a re-encoded format, so some data is discarded to reach the target format. MP3 is the most compatible audio format, at the cost of some quality.
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.