M4A to MP3 Converter

Why convert M4A to MP3?

M4A is the audio format Apple uses for music — files purchased from iTunes, voice memos from iPhones, and audio extracted from Apple's video formats are usually M4A. It typically contains AAC audio, which is technically more efficient than MP3 at the same bitrate. The catch is compatibility: some older devices, certain car stereos, basic media players, and older audio editors don't support M4A.

MP3 is the universal audio format — it works on literally everything. If you've got M4A files that won't play in your car, on an old MP3 player, or in an audio editing program, converting to MP3 solves the problem instantly.

There's a small quality loss in this conversion since you're going from one lossy format to another, but at decent bitrates the difference is inaudible.

About M4A

M4A (MPEG-4 Audio) is Apple's preferred audio container. It usually contains AAC-encoded audio, which is more efficient than MP3 — meaning a smaller file at the same audible quality. M4A files come from iTunes, Apple Music downloads, iPhone voice memos, and audio extracted from MP4 video files.

About MP3

MP3 (MPEG-1 Audio Layer III) is the universal compressed audio format. It's been the standard since the late 1990s and is supported by every device, every player, every car stereo, and every audio platform on the planet.

Quality and file size

Both M4A (AAC) and MP3 are lossy formats, so there's a small quality loss from re-encoding. At 192 kbps or higher, this loss is inaudible to virtually all listeners on virtually all equipment. The output MP3 will be slightly larger than the M4A at the same audible quality, since MP3's compression is less efficient than AAC's.

Filesmith runs entirely in your browser using WebAssembly. Files are never uploaded to any server — conversion happens locally on your device, instantly and privately.