MixMasterAIAAC to MP3 Converter
AAC is the standard for Apple devices, YouTube, and most streaming services — same compression family as MP3 but slightly more efficient. The places that still need MP3 are older car stereos, embedded media players, voicemail systems, and cheap MP3-only USB drives. That's the conversion this tool handles.
How it works
Drop the AAC
Either raw .aac files or .m4a files (which are AAC inside an MP4 container). Both decode the same.
Up to 200 MB
Pick a bitrate
Most AAC sources are encoded at 128-256 kbps. Re-encoding to 320 kbps MP3 doesn't add quality — it just keeps every detail of the source. For files going to old hardware, 192 kbps is plenty.
Encoder: libmp3lame · CBR
Download
Tags from the AAC's MP4 container map to ID3v2 on the MP3, so artist/album/title carry over.
Standard MP3 with ID3v2
Frequently asked questions
Will I lose audio quality going AAC to MP3?
Some, yes. Both are lossy and re-encoding adds a generation of compression on top of what the AAC already lost. At 320 kbps the difference is below most listeners' threshold of audibility, but it's not zero. If you have access to a lossless source, encode MP3 from that instead.
Is AAC better than MP3?
At the same bitrate, AAC compresses more efficiently — a 256 kbps AAC sounds roughly equivalent to a 320 kbps MP3. AAC also handles complex frequencies (cymbals, reverb tails) better. MP3 has wider compatibility — every device built since the late 90s plays MP3, while older devices may not handle AAC.
Will my tags survive the conversion?
Yes. AAC files use MP4 metadata atoms; MP3 uses ID3 tags. ffmpeg maps between them automatically — title, artist, album, year, genre, track number all transfer.