Converting AAC to MP3 swaps a modern, efficient lossy codec for the most universally supported format in audio. AAC generally sounds better at matched bitrates, but MP3 plays on hardware that AAC doesn't: older cars, dash cams, cheap USB players, certain Bluetooth receivers.
Drag & drop audio files here, or browse
Drop your AAC files here
Two lossy codecs in series loses a little more than the original encode did. Keep the MP3 bitrate at or above the AAC's bitrate to minimize this. Going from 128 kbps AAC to 128 kbps MP3 will actually sound slightly worse than the AAC because MP3 is less efficient.
MP3 plays on every audio device made in the last 25 years. There is no practical gap in MP3 support anywhere you might want to play audio.
AAC is the successor the MPEG group designed to replace MP3. At 128 kbps it typically sounds as good as MP3 at 192 kbps. It's the default codec for YouTube audio, iTunes purchases, Apple Music, and nearly every streaming service that isn't using Opus or Vorbis.
MP3 is the most widely supported lossy audio format. Encoded in 1993 and still the default on countless devices, it trades some fidelity for dramatically smaller files. At 192 kbps most listeners cannot distinguish it from the source. Anything that plays audio will play MP3.
At the same bitrate, slightly yes. MP3 is less efficient than AAC. Bump the MP3's bitrate 20–30% higher than the AAC to land at roughly equivalent quality.
Pre-2009 iTunes purchases had FairPlay DRM. Modern purchases and Apple Music downloads are still DRM-protected in Apple's AAC variant. You can't convert those without first playing them through software that strips DRM (which may violate the service terms).
AAC is the successor the MPEG group designed to replace MP3. At 128 kbps it typically sounds as good as MP3 at 192 kbps. It's the default codec for YouTube audio, iTunes purchases, Apple Music, and nearly every streaming service that isn't using Opus or Vorbis.
MP3 is the most widely supported lossy audio format. Encoded in 1993 and still the default on countless devices, it trades some fidelity for dramatically smaller files. At 192 kbps most listeners cannot distinguish it from the source. Anything that plays audio will play MP3.
Yes. The converter runs entirely in your browser using FFmpeg compiled to WebAssembly. Your audio files are never uploaded, never sent to a server, and never leave your device.
There's no hard limit, but because everything runs in your browser you're bounded by available memory. Files over about 2 GB total can get slow or hit browser memory limits. Process in smaller batches if you run into issues.