Why won't my car stereo play AAC files?

Older car stereos (pre-2015) typically support MP3 and WMA only. AAC support became common in newer models but isn't universal. Converting to MP3 guarantees playback on any stereo.

Will I lose audio quality converting AAC to MP3?

Some loss is unavoidable because both are lossy formats. At 192 kbps MP3, the difference is inaudible for most listeners. AAC is actually more efficient than MP3 at the same bitrate, so you're trading a slight quality advantage for compatibility.

Are my audio files uploaded to a server?

No. FFmpeg.wasm runs in your browser. Files never leave your device.

What devices can't play AAC files?

Older Android versions (pre-4.4), some budget Bluetooth speakers, older car stereos, Windows Media Player without additional codecs, and some Sonos and Amazon Echo integrations may have trouble with AAC. MP3 plays on all of them.

Is AAC better quality than MP3?

Yes, technically — AAC achieves the same perceptual quality at roughly 70–80% of the MP3 bitrate. However, MP3 is more universally supported. Convert to MP3 when compatibility is the priority.

Can I batch convert AAC files?

Yes — up to 20 files at once.

AAC to MP3 Converter

Convert AAC to MP3 free online — no upload, no signup. Fix AAC compatibility on older devices, car stereos & media players. Browser-based, 100% private.

FileConvertir — Free Online File Converter