Convert FLAC to AAC
Make phone-friendly AAC copies of your lossless FLAC files without giving up much sound quality. Your audio stays in your browser the whole time.
Why convert FLAC to AAC?
FLAC is ideal for archiving, but it is large and some phones, car systems and Apple apps do not play it without help. AAC plays natively across Apple devices and most modern players, at a size that makes it easy to carry a big library around. Convert when you want your music on an iPhone, in a car, or anywhere FLAC is not supported. Keep the FLAC files as your archive.
Quality and file size
Starting from lossless FLAC gives AAC the cleanest possible input, so this single encode sounds excellent. At 256 kbps AAC is transparent for most listeners, and it is usually more efficient than MP3 at the same bitrate. Expect the AAC to be a small fraction of the FLAC's size. Treat it as a listening copy: re-encode future versions from the FLAC rather than from the AAC, since each lossy generation adds a little loss.
FLAC to AAC: common questions
Will converting FLAC to AAC sound worse?
Slightly, in a technical sense, because AAC is lossy. At 256 or 320 kbps most people cannot tell the difference from the FLAC in a blind listening test. Keep your FLAC files if you ever want the lossless original back.
Is my file uploaded anywhere?
No. The conversion runs entirely in your browser with FFmpeg compiled to WebAssembly. Your file never leaves your device, and we never see it, store it, or train on it.
AAC or M4A for my phone?
Pick M4A. It uses the same AAC audio but stores track names and album art, which your music app will use. Raw .aac is only worth choosing when a specific system asks for it.
What bitrate should I use?
256 kbps is a great balance of size and quality for music. Choose 320 kbps if storage is not a concern, or 192 kbps for spoken word and podcasts.
Who makes this?
We're the small team behind Xport Studio, a private, fully offline app for AI vocals, stems, and mastering. These free tools are side experiments we wanted to share. No upsell, but if you're curious about the bigger thing, take a look.