How do I convert AAC to MP3?

Upload your AAC file using the box above, confirm MP3 as the output format, then select Convert. The converted file is ready to download as soon as processing finishes — usually in a few seconds.

Is converting AAC to MP3 free?

Yes, and there is nothing to sign up for. Every conversion route is free on every plan — paying raises limits such as file size and how many conversions you get, and removes advertising. It never unlocks a format, adds a watermark or degrades the output.

Will the quality change when converting to MP3?

MP3 uses lossy compression, so some data is discarded to keep the file small. The default quality setting is tuned to be visually or audibly transparent for most material, and you can raise it in the conversion settings.

What happens to my file afterwards?

The uploaded file is deleted as soon as the conversion completes, and the converted file is removed automatically once its retention window ends. Download links are signed and expire within minutes.

aacmp3

Convert AAC to MP3

Free online converter for AAC files. The most widely compatible lossy audio format. Nothing to install, no watermark, and every file is deleted automatically.

Drag and drop your files

Upload a AAC file to convert it to MP3. Up to 3 files at once, 100 MB each.

Free · up to 3 files · 100 MB each · files deleted automatically after 1 hour.

About AAC and MP3

AAC .aac

MP3's designated successor, and the default in the Apple ecosystem and most streaming services. Better sound than MP3 at the same bitrate.

Good for

Noticeably better than MP3 at equal bitrates
The default across Apple devices and most streaming
Handles multichannel audio properly

Trade-offs

Lossy
Patent licensing is more involved than Opus or Vorbis

audio/aac

MP3 .mp3

The format that made digital music portable. Lossy, thirty years old, and still the safest choice when you have no idea what will play the file.

Good for

Plays on essentially every device ever made
Small files at listenable quality
Patents long expired, so support is everywhere

Trade-offs

Lossy — detail is gone permanently
Beaten by AAC and Opus at the same bitrate
No transparency about what was discarded

audio/mpeg

AAC and MP3 side by side

AAC compared with MP3
	AAC	MP3
Compression	Lossy	Lossy
Typically used for	Streaming, Apple devices, video soundtracks	Music, podcasts, anything that must simply play

What changes when you convert AAC to MP3

This is a re-encode, not a repackage

Some tools can move a stream into a different container untouched when the codecs happen to line up. We do not — every job here is decoded and encoded again, so the conversion takes time in proportion to the length of the file and costs a small amount of quality even where a repackage would have been possible. In exchange the output is predictable: it plays everywhere, rather than inheriting whatever the source happened to contain.

What your MP3 will contain

The output is MP3 — written by LAME, the reference MP3 encoder, at 192 kbps by default. That sits comfortably above the point most people stop hearing a difference on ordinary equipment, and the bitrate is adjustable from 32 up to 320 if you want the file smaller or the quality nearer the source.

Re-encoding costs a little quality

Both formats are lossy, so this decodes AAC and compresses again as MP3. That second pass loses a small amount on top of what was already gone. It is barely audible once, and it accumulates if a file is converted repeatedly — so convert from the original rather than from a previous conversion.

Other AAC conversions

Other ways to get MP3

Worth reading next

What 192 kbps actually means, and when you need more
Bitrate is the single dial that decides how big an audio file is and how good it sounds. Here is what the numbers mean, why they are not comparable between codecs, and where the real thresholds sit.
6 min read