AAC is the successor audio codec to MP3 used by YouTube and Apple. It is 30% more efficient than MP3 at the same quality. However, AAC isn't always ideal — especially when you need MP3.
MP3 brings the advantage: Most compatible audio — plays on every phone, car, speaker. Small, daily-use quality.
With FORMATTO, you can convert AAC to MP3 in seconds. Everything runs 100% on your device — files are never uploaded to any server, so your privacy is guaranteed. Did you know? AAC became the default on YouTube and iTunes because of its efficiency.
How to convert AAC to MP3
- 1Select or drag your AAC files to the box above (batch supported).
- 2Adjust quality and size as needed, then click "Convert to MP3".
- 3Download results one by one or together as a ZIP. Done — no signup, no upload.
Why your files are safe
100% on device
Files never leave your device.
No trace
Close the tab, data is gone.
Free
Unlimited, no watermark.
Frequently asked questions
How to convert AAC to MP3?
Just drag your AAC files to the converter box above, pick your settings, then click convert. The MP3 result is ready to download — all processed on your device.
Is FORMATTO really free?
Yes, 100% free with unlimited conversions. Because everything runs in your browser, we have no per-conversion server cost — so it stays free forever.
Are my AAC files safe?
Very safe. Your files are processed directly on your device and never uploaded to a server. When the page is closed, no trace remains.
How many files can I convert at once?
You can process many files at once (batch). Download them individually or as a single ZIP.