Convert mp3 to m4a
Converted on your device. Files never leave this tab. Output tops out around 2 GB.
Nothing is uploaded
The converter runs inside this page. Cut your network after it loads and it still works.
No account, no daily limit
No sign-up, no daily limit, no watermark, no queue behind other people's files. Batch as many MP3 files as you like.
Real M4A output
Encoded by ffmpeg, the same library the command-line tools use — not a renamed extension.
About MP3
MPEG-1 Audio Layer III
A lossy audio format developed largely at the Fraunhofer Institute and standardized as part of MPEG-1 in 1993. Its patents expired in 2017, and typical bitrates run from 128 to 320 kbps. Use it when audio has to play everywhere: car stereos, old MP3 players, any phone or browser.
About M4A
MPEG-4 Audio
An audio-only MPEG-4 file, the format iTunes and Apple Music use. It usually holds lossy AAC and sometimes lossless ALAC. Use it for iPhones, Macs and iTunes libraries, where it plays and tags natively.