AAC to MP3
Convert AAC to MP3 online for free — turn .aac and .m4a audio into MP3 files that work with every device, app and car stereo. Choose 96 to 320 kbps, mono or stereo, trim, fade and normalise. Runs privately in your browser.
100% private — your audio is converted on your device, never uploaded. Conversion happens on your device; nothing is uploaded.
Your browser decodes the audio and an open-source MP3 encoder (LAME, via lamejs) converts it on your device — nothing is uploaded. Works with MP4, MOV, M4A, WebM, MKV, WAV, OGG and more; very long files need plenty of memory, so trim if your browser struggles.
How to convert AAC to MP3
- Drop your AAC or M4A file in the box.
- Choose the MP3 quality and stereo or mono.
- Optionally trim, fade or normalise.
- Click Convert to MP3, preview and download.
What you can use it for
- Play AAC recordings on older MP3 players and car stereos
- Use audio in apps and sites that only accept MP3
- Share recordings across devices
- Convert podcast and radio recordings
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AAC or MP3 — which is better?
AAC sounds slightly better at the same bitrate, but MP3 is supported everywhere. Converting at 192 kbps or higher keeps the quality high.
Which quality should I choose?
192 kbps sounds excellent for music and keeps files small; 320 kbps is the highest MP3 quality. For podcasts and speech, 96–128 kbps in mono is plenty.
Can I convert just part of the file?
Yes — set a start and end time (minutes:seconds) before converting. Fade in and out smooths the cut edges.
Is there a file size limit?
There's no upload limit because nothing is uploaded, but the whole file is decoded in your browser's memory. Files up to a few hundred MB work well on most computers; for very long recordings, convert in parts.
Is my file uploaded?
No. Decoding and MP3 encoding both happen on your device.