Convert MP3 to AAC for smaller files and better quality on Apple devices and streaming. Drop a .mp3 file below and the output is already set to AAC.
Drop or choose your audio files
The assistant opens with your files and does the rest.
Choose Files
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Drag and drop your .mp3 file onto the box above, or click Choose Files. The request is already filled in: “Convert this to AAC”.
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The AI assistant uses sensible defaults. To choose the bitrate, codec or sample rate yourself, say so in the request, for example “Convert this to AAC at 320 kbps”.
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The assistant opens with your file and converts it on your own device; the file itself is never uploaded. When the AAC file is ready, click Save. Prefer to set everything by hand, or batch-convert several files into a ZIP? The classic converter is one click away on this page.
AAC achieves the same quality as MP3 at roughly 25% lower bitrate and is the native codec of iPhone, YouTube and most streaming services. Converting MP3 to AAC modernises an old library or prepares audio for platforms that require it.
Because both formats are lossy, a second encode adds a little loss; choose a bitrate equal to or above the MP3's. Everything runs in your browser.
MP3 (MPEG-1 Audio Layer III): MP3 is the universal lossy audio format. It plays on every device made in the last twenty-five years and offers small files with good quality at 192 to 320 kbps. It is best for music players, podcasts, phones and sharing.
AAC (Advanced Audio Coding): AAC (Advanced Audio Coding) is the successor to MP3 and the codec behind M4A, YouTube and most streaming services. A raw .aac file is an AAC stream without an MP4 wrapper. It is best for streaming, YouTube and modern devices.
In short: keep MP3 when the priority is music players, podcasts, phones and sharing, and switch to AAC when the file is headed for streaming, YouTube and modern devices. Need a different target? The full Audio Converter supports every format listed below.
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