Turn your MP3 into a smaller, efficient AAC file — the format used across Apple devices,
streaming platforms, and most modern apps. It's converted right on your own device, so the
audio file itself is never sent anywhere. Processed locally on your device — your file is never uploaded.
Max file size: 100MB. Select the MP3 you'd like to convert. It never leaves your device at any point in the process. Your browser encodes the audio into AAC. Most browsers do this almost instantly; a few load a small compatibility engine first — either way, nothing is sent to a server. Download your new AAC file — smaller than the original MP3 and ready for phones, apps, or streaming. Yes — completely free, with no sign-up and no hidden limits. AAC generally delivers better sound quality than MP3 at the same file size, which is why it's
the default format on Apple devices and most streaming services. It's a good pick when you want
smaller files without a noticeable drop in quality. Both MP3 and AAC are "lossy" formats, so converting from one to the other can introduce a
small amount of additional quality loss on top of whatever the original MP3 already lost. For
the best results, convert from an original, uncompressed source whenever you have one — but for
everyday use, converting an existing MP3 works perfectly well. Most modern browsers (Chrome, Edge, Safari) have a built-in AAC encoder and convert almost
instantly. A few browsers, like Firefox, don't include one, so this tool briefly loads a small
in-browser conversion engine first. That only adds a short one-time delay — your file still
never leaves your device either way. No, never. Whether your browser converts the file instantly or needs a moment to load the
compatibility engine, your actual audio file stays on your device the entire time.MP3 to AAC Converter
How It Works
Pick Your File
On-Device Encoding
Save Your File
Common Questions
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