Audio conversion
Convert AAC to FLAC
Updated Jul 2026
AAC is a compressed audio format used by Apple Music, iTunes, and most streaming services, while FLAC preserves every bit of the original recording. To convert AAC to FLAC, open the file in a converter and export it as FLAC. Doing this on your own computer keeps your music library off other people's servers, with nothing to upload.
- Extension
- .aac
- Type
- Audio
- Typically
- Apple / streaming audio
- Compression
- Lossy
- Extension
- .flac
- Type
- Audio
- Typically
- Lossless music
Convert AAC to FLAC on your own computer. Nothing uploads.
How to convert AAC to FLAC
- Open Morphjet and drag in the AAC files you want to convert, or a whole folder of them at once.
- Choose FLAC as the output format.
- Convert. The FLAC files are written next to your originals, and nothing leaves your machine.
AAC vs FLAC: what actually changes
| AAC | FLAC | |
|---|---|---|
| Quality | Lossy, some detail discarded when encoded | Lossless, matches the source exactly |
| File size | Smaller, a few megabytes per song | Larger, often 2 to 3 times bigger |
| Compatibility | Wide, especially on Apple devices | Good, but not supported on every app or device |
| Restores lost detail | No | No, it can't add back what AAC already discarded |
| Keeps track tags (title, artist, album) | Yes | Yes, if the converter carries them over |
When to convert, and when not to
Convert AAC to FLAC when you're building a lossless library and want every file in one consistent format, or when an app or device you use only accepts FLAC.
Skip the conversion if you're just trying to improve audio quality, because FLAC can't recover the detail AAC already threw away when it was first encoded, so the result is a bigger file with the same sound.
Why not just use an online converter?
Converting audio on an online tool means your music files, and sometimes the personal library they came from, get uploaded to a server you don't control. Converting AAC to FLAC on your own computer keeps every track local, with no upload and no account needed. You can do it with your internet turned off entirely.
Questions
Does converting AAC to FLAC improve the sound quality?
No. AAC is lossy, so whatever detail was discarded when the file was first encoded is gone for good. FLAC just stores the AAC's existing quality without compressing it further, and the file gets bigger without sounding better.
Why would I convert AAC to FLAC at all?
Mostly for consistency. If you're organizing a library where everything else is FLAC, or a device or app you use expects FLAC files, converting keeps things uniform even though it won't restore lost quality.
Will my song titles and artist info carry over?
Yes, as long as the converter reads and writes tag data, which Morphjet does. Track title, artist, and album should transfer automatically.
Does FLAC work on iPhone and Apple Music?
Support has improved but is inconsistent. Some apps and newer devices can play FLAC, while others, including some older Apple software, cannot. Check your specific app before assuming it will work.
Can I convert AAC to FLAC without an internet connection?
Yes. Morphjet runs the conversion on your own computer, so it works fully offline and nothing about your music library ever leaves your machine.
Morphjet converts AAC, FLAC, and 1,800+ other formats, all on your machine. Launching this July.