M4A to MP3
Convert iPhone voice memos and iTunes M4A files to MP3 that plays everywhere. Nothing leaves your device.
MP3 uses the LAME encoder (130 KB, downloaded once).
M4A
M4A is AAC audio in an MP4 container. iPhone voice memos, iTunes purchases and many podcasts use it.
Some car stereos, older players and Windows programs don’t play M4A, while MP3 works everywhere.
MP3
MP3 is the most widely supported audio format: every phone, car, speaker and website plays it.
MP3 is lossy. Converting it to a lossless format doesn’t restore detail, but gives editors the WAV they expect.
How it works
- Your browser decodes the M4A file at its own sample rate, so a 44.1 kHz song stays 44.1 kHz. Rare formats such as WMA or AMR go through FFmpeg compiled to WebAssembly.
- MP3 is encoded with LAME, the reference MP3 encoder, at the bitrate you pick.
- Several files are converted one after another and can be downloaded together as a ZIP.
Questions
Are my files uploaded?
No. Decoding and encoding run on this device. Only the encoder code (130 KB for MP3) is downloaded once.
Which MP3 quality should I pick?
192 kbps or VBR V2 sounds the same as the original to almost everyone. Use 320 kbps if a site asks for it, 64 kbps for speech only.
Does converting MP3 to FLAC or WAV improve quality?
No. A lossless file keeps exactly what the MP3 had, it can’t bring back what MP3 removed. It’s useful when an editor or a DJ program needs WAV.