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AAC to MP3

Free online audio converter

Convert AAC audio files to MP3

This free converter turns any AAC audio file — .aac, .m4a, .m4b or audio-only .mp4 — into MP3 at 128, 192, 256 or 320 kbps. It runs entirely in your browser with no signup and no software install, handles up to 20 files per batch at 100 MB each, and never uploads your audio to a server.

  • 100% free
  • No upload
  • No signup
  • Up to 320 kbps
  • Batch of 20
  • Works offline

Drop your AAC audio files here to convert them to MP3

.aac, .m4a, .m4b, .m4r and audio-only .mp4 — up to 20 files, 100 MB each

How to convert AAC audio files to MP3

Three steps, no account, no upload. Files are decoded and re-encoded on your own device.

  1. Add your AAC audio files

    Drag .aac or .m4a audio files onto the drop zone, or press Choose AAC files to browse your device. The converter accepts any AAC-encoded audio — standalone .aac files, iTunes .m4a tracks, and audiobook .m4b containers. You can queue up to 20 files at a time, 100 MB each.

  2. Pick the MP3 bitrate

    Choose a bitrate between 128 and 320 kbps. 192 kbps is the default and preserves the quality of a typical 128–256 kbps AAC audio file. For speech recordings and podcasts, 128 kbps keeps files small with no audible difference.

  3. Download your MP3 files

    Each file converts as soon as it enters the queue, with a live progress bar. Press Download MP3 on any finished track, or use Download all to grab the entire batch — original filenames are preserved, only the extension changes to .mp3.

AAC audio to MP3 — frequently asked questions

How do I convert an AAC audio file to MP3?

Drop your .aac or .m4a file onto the converter at the top of this page, pick a bitrate (128, 192, 256 or 320 kbps), and press Download MP3 when the progress bar completes. There is nothing to install — the conversion runs inside your browser on your own device.

What is an AAC audio file?

AAC (Advanced Audio Coding) is a lossy audio codec standardised by MPEG. It is the default format for Apple Music, iTunes, YouTube audio tracks and many streaming services. Files typically carry the .aac, .m4a or .m4b extension. AAC delivers better sound quality than MP3 at the same bitrate, but MP3 has wider hardware support.

Is converting AAC audio to MP3 free?

Yes, completely. No account, no email, no daily file cap, no watermark, and every bitrate up to 320 kbps is included. The tool is funded by ads, not gated features.

Are my AAC audio files uploaded to a server?

No. Your browser decodes the AAC natively and re-encodes it to MP3 using a LAME encoder running in a Web Worker — all on your device. Your audio, filenames and metadata never leave the tab, and the converter still works with the network disconnected.

Does converting AAC audio to MP3 reduce quality?

Slightly, because both are lossy codecs and the audio is compressed a second time. At 256 or 320 kbps the difference is inaudible for almost everyone; 192 kbps holds up well for music on ordinary headphones. Always keep the AAC original if the recording is irreplaceable.

Which AAC audio formats does this converter support?

Any file your browser can decode as AAC: standalone .aac files, .m4a (iTunes, Voice Memos, GarageBand), .m4b (audiobooks), .m4r (ringtones) and audio-only .mp4 containers. DRM-protected .m4p files from the old iTunes Store cannot be decoded by any browser and will show an error.

Can I convert multiple AAC audio files at once?

Yes. Drop up to 20 files in one batch and they convert sequentially, each with its own progress bar and download button. Press Download all to save every finished MP3 in one click.

What bitrate should I use for AAC audio to MP3?

For music, 192 kbps is a safe default — transparent on most headphones. Use 256 or 320 kbps when the source AAC was high-bitrate (256 kbps AAC or above) and you want to preserve every detail. For podcasts, voice memos and audiobooks, 128 kbps is plenty and keeps files small.

Why AAC audio files often need converting

AAC (Advanced Audio Coding) is the successor to MP3 in the MPEG standard and is used by Apple, YouTube, Spotify and most modern streaming platforms. At the same bitrate it sounds better than MP3, but MP3 still has the widest hardware support of any audio format — car stereos, DJ decks, portable players, gym equipment and most embedded devices play MP3 natively.

If you have .m4a files from iTunes or Apple Music specifically, the M4A to MP3 converter page covers that case. For raw .aac files or a mix of AAC containers, this page does the same conversion — the pipeline is identical because .m4a is just AAC wrapped in an MP4 container. Either way, the guide to converting without quality loss explains how bitrate selection affects the result.

Need to convert many files at once? The tool handles 20 per batch, and the batch conversion guide covers strategies for larger collections using command-line tools like FFmpeg.

Your audio never leaves this tab

There is no upload step and no conversion server. Your browser decodes the AAC audio natively and a LAME encoder running in a Web Worker writes the MP3 — all on your device. Close the tab and the audio is gone from memory.