Convert MP3 to AAC

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Converting MP3 to AAC is free: drop your MP3 above, hit convert, and download the AAC. Files delete themselves within an hour.

MP3 and AAC are both lossy formats, so flipping MP3 to AAC is really about compatibility: getting your audio into a shape the stubborn device or app will actually take. Where MP3 struggles with holding fine detail at low bitrates: it stays small by quietly discarding sound, AAC earns its keep: it's built for streaming-grade sound at friendly file sizes.

FYI

Small print: MP3 and AAC are both lossy, so every re-encode shaves off a little more. Convert once, from the best source you have: not repeatedly.

Why flip MP3 to AAC

MP3 is the format that taught music to travel: small, scrappy, and welcome absolutely everywhere. It was born in 1993, Fraunhofer Institute, Germany, and its real weak spot is holding fine detail at low bitrates: it stays small by quietly discarding sound.

AAC is MP3's better-trained successor: cleaner sound from the same number of bits. Advanced Audio Coding: the default soundtrack of YouTube, iTunes and most MP4 video. That makes it the right destination when what you need is streaming-grade sound at friendly file sizes.

How to convert MP3 to AAC

1
Drop your MP3 file into the flipper above, or click to browse for it.
2
Check the output format: AAC is already selected for you.
3
Hit Convert, give it a moment, then download your new AAC.

MP3 vs AAC, side by side

	MP3	AAC
Born	1993, Fraunhofer Institute, Germany	1997, an MPEG all-star team: Fraunhofer, Dolby, Sony, AT&T and Nokia
Type	audio · lossy	audio · lossy
Best for	playing on anything with a speaker, from new phones to twenty-year-old car stereos	streaming-grade sound at friendly file sizes
Weak spot	holding fine detail at low bitrates: it stays small by quietly discarding sound	older or stubborn hardware that only ever learned MP3
Typical size	about 1 MB per minute at 128 kbps: roughly a tenth of CD audio	similar to MP3, but it sounds better at the same bitrate: or the same at about 25% smaller
Plays on	Everything. Phones, browsers, cars, smart speakers, ancient iPods.	Apple everything, YouTube, Android, modern players; patchy on legacy gear.

Questions people ask

Will converting MP3 to AAC lose quality?

A small amount: both formats are lossy, so re-encoding trims a little detail. Converting once at a decent bitrate keeps it inaudible for most ears.

Will the AAC file be bigger or smaller than my MP3?

In the same neighborhood: AAC runs similar to MP3, but it sounds better at the same bitrate: or the same at about 25% smaller, and you control the bitrate.

Where will the AAC file play?

Apple everything, YouTube, Android, modern players; patchy on legacy gear. That's the usual reason people leave MP3 behind: AAC simply opens in more of the places that matter.

How long does MP3 to AAC conversion take?

Seconds for most files: audio is light work. A long recording might take a minute; your file auto-deletes from our servers within an hour either way.

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