Convert MP3 to M4A
Choose your MP3 file and get a M4A file in seconds. Nothing leaves your device.
Converter
- FilesOne or many, images and videos mixed
- FolderEvery matching file inside, subfolders included
- ArchiveZIP, RAR, 7z or TAR: convert the contents or the archive itself
Drop files, folders or archives here
Unsupported files are skipped. Nothing is uploaded.
Everything runs in your browser. Files are not uploaded.
About this conversion
Only the audio encoding changes: the recording is decoded and encoded again in your browser.
Good to know
Recompressing a lossy file costs a little more quality.
How it works
The audio is converted by ffmpeg compiled to WebAssembly. It loads only when you choose a file and runs in a background thread.
Your browser can
- Built-in image codecs
- Hardware video (WebCodecs)
- Multiple threads
- Create AVIF natively
If something is missing, the conversion takes a little longer but still works.
About MP3 (MPEG-1 Audio Layer III)
MP3 is the classic compressed audio format that plays on practically every device made in the last 25 years.
- Music collections
- Podcasts and audiobooks
- Sharing recordings with anyone
About M4A (MPEG-4 Audio, usually AAC)
M4A is the MP4 container holding only audio, usually AAC, and the default format of iTunes and Apple Music.
- Better quality than MP3 at the same size
- Full metadata and cover art
- Native on iPhone, iPad and Mac
Related conversions
Frequently asked questions
Are my files uploaded to a server?
No. The conversion runs entirely in your browser with local code. Your files never leave your device, and there is no upload.
Is there a file size limit?
There is no limit on our side, but your browser memory is. Images work for very large files; for videos, files above a few hundred megabytes can fail on devices with little memory.
Will the quality suffer?
That depends on the target format and settings. Use the quality option to balance size and detail; lossless targets keep everything the source contained.
Which browsers are supported?
Current versions of Chrome, Edge, Firefox and Safari. Fast hardware paths are used where available, with a compatible fallback otherwise.