What happens when you convert AAC to FLAC
| Compression | Lossy → Lossless |
|---|---|
| Size per minute | AAC ≈ 1.4 MB → FLAC ≈ 6.4 MB |
| Quality | No further loss, but the FLAC cannot restore what AAC compression removed |
| Tags | Title, artist and album tags are copied when the target format supports them |
| Opens in | Android, Windows 10/11, macOS and audiophile players; older stereos do not |
Sizes are typical values; your files will vary with content and settings.
AAC Advanced Audio Coding
AAC is the successor to MP3 and the audio codec inside most MP4 videos, YouTube and Apple Music. A raw .aac file is an ADTS stream without a container.
AAC converterFLAC Free Lossless Audio Codec
FLAC compresses audio losslessly to around 50 to 60 percent of WAV size. Decoding gives back the exact original samples, so it is the format of choice for archiving music.
FLAC converterHow to use the AAC to FLAC Converter
- 1
Choose a AAC file or drop it onto the page.
- 2
Review the audio options. The defaults suit most files.
- 3
Click Convert and download your FLAC when processing finishes.
Why convert AAC to FLAC?
Raw AAC files come from some phone recorders, internet radio streams and audio pulled out of videos. Raw .aac files have no chapter or cover-art support and some players skip them. Choose FLAC to keep the audio lossless at roughly half the size of WAV.
Frequently asked questions
Will the FLAC lose quality?
FLAC is lossless, so the conversion keeps every pixel or sample that is in your AAC file. It cannot bring back detail that AAC compression already removed, and the FLAC file will usually be larger.
Will the FLAC be smaller than the AAC?
No, usually larger: a minute of audio takes about 1.4 MB as AAC and about 6.4 MB as FLAC. FLAC is lossless, so its size depends on the audio rather than a bitrate setting.
Questions about privacy, file-size limits or conversion speed are answered in the general FAQ.