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AAC to MP3

Free online file converter

Convert your AAC audio file to MP3

Got a .aac or .m4a file that won't play on your device? Drop it here and get an MP3 back in seconds. The converter runs entirely in your browser — your audio file is never uploaded — and supports bitrates from 128 to 320 kbps, up to 20 files per batch at 100 MB each, with no signup and no software to install.

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

Drop your AAC audio file here to convert it to MP3

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

How to convert an AAC audio file to MP3

Three steps, no account, no upload. Your audio file is decoded and re-encoded on your own device.

  1. Open your AAC audio file

    Drag your .aac, .m4a, .m4b or audio-only .mp4 file onto the drop zone, or press Choose AAC files to browse your device. The converter reads any AAC-encoded audio file — standalone .aac recordings, iTunes .m4a tracks, audiobook .m4b files and even .m4r ringtones. Queue up to 20 files at a time, 100 MB each.

  2. Choose the MP3 bitrate

    Select a bitrate between 128 and 320 kbps. 192 kbps (the default) preserves the quality of a typical AAC audio file encoded at 128–256 kbps. For voice recordings and podcasts, 128 kbps keeps files small with no audible difference.

  3. Download the MP3

    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 from .aac/.m4a to .mp3.

AAC audio file to MP3 — frequently asked questions

How do I convert an AAC audio file to MP3?

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

Which AAC audio file types does this converter accept?

Any file your browser can decode as AAC: standalone .aac files, .m4a (iTunes, Apple Music, 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.

Is the AAC audio file converter free?

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

Does my AAC file get uploaded to a server?

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

Does converting an AAC file to MP3 lose 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 is a good balance for music on ordinary headphones. Always keep the original AAC file if the recording is irreplaceable.

Can I convert multiple AAC files to MP3 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.

Is there a file size limit?

Each file can be up to 100 MB — enough for a multi-hour audiobook or long podcast episode. Because everything runs locally in your browser, there is no upload bottleneck and no server-side timeout.

What bitrate should I use for my AAC audio file?

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.

When you have an AAC file and need MP3

AAC audio files are everywhere — Apple Music downloads, iPhone Voice Memos, YouTube rips, podcast recordings. The codec is technically superior to MP3 (it sounds better at the same bitrate), but MP3 still has broader hardware support. Car stereos, DJ decks, portable players, gym equipment and many embedded devices only read MP3. That single compatibility gap is the reason you are here.

The converter handles every AAC container: standalone .aac files, iTunes .m4a tracks, audiobook .m4b files and .m4r ringtones. If your files are specifically from iTunes or Voice Memos, the M4A to MP3 converter covers that case. For a deeper look at the AAC codec itself, the AAC format to MP3 page explains the technical details.

Both AAC and MP3 are lossy, so re-encoding always involves a second pass of compression. The guide to converting without quality loss explains how to pick the right bitrate to keep the difference inaudible. Need to convert a large collection? The batch conversion guide covers strategies for hundreds of files.

Your audio file never leaves this tab

There is no upload step and no conversion server. Your browser decodes the AAC audio file 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.