Audio ToolsFree

MP3 to AAC

Convert MP3 audio files to AAC format for better compression at equivalent quality. AAC (Advanced Audio Coding) is the successor to MP3 — it achieves better audio quality at the same bitrate, especially noticeable below 128 kbps. Outputs as M4A. No signup.

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MP3, AAC, WAV, FLAC, OGG, WMA, AIFF, M4A

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Frequently Asked Questions

Is AAC better quality than MP3?▼
Yes. AAC (Advanced Audio Coding) achieves better audio quality than MP3 at the same bitrate, particularly below 128 kbps. At 128 kbps AAC sounds noticeably better than 128 kbps MP3. Above 256 kbps, both formats sound excellent.
What is the output format — AAC or M4A?▼
The output is an M4A file (.m4a), which is AAC audio stored in an MPEG-4 container. This is the standard Apple audio format and plays on iPhone, iPad, Mac, Android, and all modern browsers.
Which devices and apps play AAC/M4A?▼
iPhone, iPad, Android, macOS, Windows Media Player, iTunes/Music app, VLC, YouTube, and virtually all modern audio apps and web browsers support AAC.
Does converting MP3 to AAC improve quality?▼
No. Transcoding between lossy formats cannot recover quality lost in the original MP3. The AAC output will be the same or slightly lower quality than the MP3 source.
Is the conversion done in the browser?▼
Yes. FFmpeg WebAssembly handles MP3 decoding and AAC encoding locally. No file is uploaded.