Convert Free Lossless Audio Codec (.flac) to Advanced Audio Coding (.aac) online for free. Fast, secure audio conversion with no watermarks or registration.
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Upload your .flac file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .aac file when it's ready.
Converting FLAC to AAC transforms lossless audio into the most efficient lossy codec widely deployed today. AAC (Advanced Audio Coding) was developed as the successor to MP3 by the MPEG group and delivers better sound quality per bit than MP3 at every bitrate. At 256 kbps, AAC is considered transparent to the original source in double-blind tests by most listeners. This conversion is ideal when you need to shrink FLAC files for portable playback without the compatibility concerns of less common codecs.
FLAC files average 800-1200 kbps, making them impractical for streaming or mobile storage. AAC at 256 kbps reduces file size by roughly 75% while retaining near-transparent audio quality. Apple devices natively play AAC but do not support FLAC without third-party software, so this conversion unlocks direct playback on every iPhone, iPad, Apple TV, and HomePod. AAC is also the mandatory audio codec for YouTube, Spotify (OGG internally but AAC for delivery), and most streaming platforms.
FFmpeg decodes the FLAC bitstream and pipes PCM audio to the AAC encoder. The default encoder is aac (FFmpeg native), but libfdk_aac provides slightly better quality when available. AAC supports sample rates from 8 to 96 kHz, bit depths up to 32-bit float, and channel configurations up to 7.1 surround. The output is a raw AAC bitstream (.aac) or can be muxed into an M4A container for metadata and seeking support. Constant bitrate (CBR) and variable bitrate (VBR) modes are both supported.
At 256 kbps VBR, AAC is transparent for the vast majority of listeners and source material. At 128 kbps, quality remains very good for casual listening. Below 96 kbps, artifacts become noticeable on critical listening equipment. Since FLAC is lossless, the AAC output represents a single generation of lossy encoding — the best possible result short of another lossless format.
| Device | FLAC | AAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Native | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
FLAC to AAC is one of the most common and practical audio conversions. Use 256 kbps VBR for high-quality archives or 128 kbps for space-efficient mobile playback. Wrap the output in an M4A container if you need metadata and chapter support.
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| No |
| Caracteristică | FLAC | AAC |
|---|---|---|
| Nume complet | Free Lossless Audio Codec | Advanced Audio Coding |
| Extensie | .flac | .aac |
| Cel mai potrivit pentru | Lossless compression | Superior to MP3 |