AAC to FLAC Converter
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Convert AAC to FLAC online
Use this AAC to FLAC converter to turn AAC files into FLAC right in your browser — ideal for lossless music, audiophile libraries and archiving audio. AAC uses lossy compression and FLAC uses lossless compression, so file size and quality can change.
When should you convert AAC to FLAC?
- When you need it for lossless music
- When you need it for audiophile libraries
- To open your files in apps that prefer FLAC
- To share FLAC files more easily
What happens to your file
The AAC audio is decoded and re-encoded to FLAC with FLAC at lossless compression. There is no video stream involved, so the job is quick even for long recordings.
Settings this conversion runs with
| Engine | ffmpeg |
|---|---|
| Output codec | FLAC |
| Setting | lossless compression |
| Compression | Lossless |
What changes
- FLAC is lossless, but it can only preserve what is already in the AAC file. Detail removed when the AAC was first encoded does not come back — you get a bigger file of the same audio, not a better one.
- Cover art, lyrics, and most tags are not carried across — the output keeps the audio, not the metadata around it.
About AAC and FLAC files
AAC audio
Strengths
- better quality than MP3 at the same size
- widely supported
Limitations
- lossy
- less universal than MP3
FLAC audio
Strengths
- lossless quality
- smaller than WAV
- great for archiving
Limitations
- larger than MP3
- not supported everywhere
AAC vs FLAC
| Format | AAC | FLAC |
|---|---|---|
| Compression | Lossy | Lossless |
| Transparency | — | — |
| Best for | streaming audio, Apple devices | lossless music, audiophile libraries |
Related tools
Frequently asked questions
- Does converting AAC to FLAC re-encode the file?
- The AAC audio is decoded and re-encoded to FLAC with FLAC at lossless compression. There is no video stream involved, so the job is quick even for long recordings.
- What should you know before converting AAC to FLAC?
- FLAC is lossless, but it can only preserve what is already in the AAC file. Detail removed when the AAC was first encoded does not come back — you get a bigger file of the same audio, not a better one.
- Is this AAC to FLAC converter free?
- Yes. You can convert AAC to FLAC online for free, with no account and no watermark.
- Do I need to install software or sign up?
- No. Use the converter from your browser without installing software or creating an account. Files are uploaded to our servers for processing.
- Are my files safe?
- Yes. Files are processed only to complete the conversion and are auto-deleted after 2 hours. We never share them.
- Can I convert multiple AAC files at once?
- Yes. Drop several files to convert them in a batch and download the results as a single ZIP.