Converting MP3 to AAC re-encodes the audio through a newer, more efficient lossy codec. AAC was specifically designed to replace MP3 and typically delivers comparable quality at about 70% of the file size, which is why every streaming service that matters has switched to it.
Drag & drop audio files here, or browse
Drop your MP3 files here
You're transcoding between two lossy codecs, so a small quality drop is unavoidable. AAC at 160 kbps will generally sound as good as MP3 at 192 kbps, so you can drop bitrate slightly without making things worse. Target at least the MP3's bitrate to preserve quality.
AAC is supported natively on iOS, macOS, Windows, Android (2.3+), and every mainstream browser. It's the default audio in MP4 video, so any platform that plays MP4 plays AAC.
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.
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.
At equivalent bitrates, yes. AAC produces noticeably fewer artifacts, especially at lower bitrates. The codec was designed as MP3's successor and achieves comparable quality at roughly 70% of the file size.
M4A, in almost every case. It's the same AAC audio but in a container that supports proper tags, album art, and chapters. Raw .aac is really only useful for streaming.
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.
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.
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.