Turn your AAC audio files into MP3 in seconds — free, private and entirely in your browser. Nothing is ever uploaded to a server.
Open the Audio Converter
Go to the DefyAudio Studio — the AAC to MP3 converter runs right in your browser.
Add your AAC file(s)
Drag and drop or browse for your AAC file. Add several at once to batch-convert them all to MP3.
Choose MP3 as the output
Select MP3 in the Format tab. Pick the bitrate that fits your quality/size trade-off.
Adjust quality (optional)
Fine-tune sample rate, channels and bit depth if you need a specific spec — otherwise the defaults are ready to go.
Convert and download
Click Convert. Your MP3 file is processed locally and downloads instantly — no data leaves your device.
AAC delivers great quality per kilobyte but plays back inconsistently outside the Apple ecosystem. Converting AAC to MP3 maximizes compatibility across devices and apps while letting you set the exact output bitrate.
Open DefyAudio's converter, add your AAC file, select MP3 as the output format, and click Convert. The MP3 file downloads instantly — free, with no upload.
Converting to MP3 re-encodes the audio; choose a higher bitrate to keep quality close to the source. DefyAudio lets you pick the exact bitrate before converting.
No. All conversion happens locally in your browser — your files never leave your device.
Yes. Add multiple AAC files and DefyAudio batch-converts them all to MP3 in one pass.