Free tool

AAC to MP3 converter Apple-era files as MP3, for every player.

Drop AAC files and download them as MP3. Pick the bitrate, keep stereo or go mono, several at once.

Drop audio files here or click to choose. MP3, WAV, M4A, AAC, OGG, FLAC, AIFF, or the sound of a video. Several at once is fine.

Convert to Bitrate MP3, M4A and OGG Channels

AAC to MP3 converter at a glance

content.win converts AAC to MP3, a whole folder in one drop, with no daily cap.

Works with: AAC files as .aac or inside .m4a and .mp4; from iTunes, Apple Music, recorders and phone apps.
Comes back as: MP3, the full length, named after the original.
Runs: In your browser.
Limits: No daily limit and no cap on how many files.
Price: Free. No account, no watermark.

Drop the AAC files in. Several at once is fine.
Pick a bitrate. 128 kbps for speech, 192 for music, 320 when every detail matters. Mono halves the size of a spoken recording.
Download the MP3 files. Each has its own player and Download button; one button takes them all.

Players and cars: Many car stereos, MP3 players and older software play MP3 and not AAC.
Editing: Editors and DAWs that skip AAC open MP3 without a plugin.
Sharing: MP3 goes through every messaging app and plays on the other end whatever the device.
Windows and Android: AAC support varies by app; MP3 plays in all of them.

AAC and MP3 are both lossy. Converting re-encodes once; at 192 kbps or above the difference is inaudible to almost everyone.
For an exact copy of what the AAC holds, choose WAV instead.

Does AAC to MP3 lose quality?

One re-encode. At 192 kbps or above almost nobody can hear it.

What is the difference between AAC and M4A?

M4A is the container Apple uses; the sound inside is AAC. Both convert here the same way.

How big will the MP3 be?

About 1 MB per minute at 128 kbps, 1.4 MB at 192, 2.3 MB at 320. Mono halves those.

Can I convert several files at once?

Yes. Drop them all; each comes back named after the original, and one button downloads the lot.