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Convert AAC to FLAC
Raw AAC files carry little duration or tag information, and some players refuse them. FLAC compresses audio to roughly half size without losing any quality.
- Free
- No sign-up
- Batch conversion
Why convert AAC to FLAC?
To convert AAC files to FLAC, drop them on the counter above.
Most files convert in seconds: no queue, no email address, and the FLAC result saves straight to your computer or phone.
How to convert AAC to FLAC
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Add your AAC files
Drag your AAC files onto the counter or pick them with Choose files. You can add several at once.
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Check the settings
The defaults suit most cases. Change quality, size or other options if you like; after a change, one click converts again.
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Conversion starts by itself
Each file is converted to FLAC and its row is stamped CONVERTED.
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Download your FLAC file
Get the file with Download. With several files you can download them all as one ZIP.
AAC vs FLAC
| Property | AAC | FLAC |
|---|---|---|
| Full name | Advanced Audio Coding | Free Lossless Audio Codec |
| Type | Audio | Audio |
| Compression | Lossy | Lossless |
| Created by | MPEG | Xiph.Org Foundation |
| Year | 1997 | 2001 |
| Extensions | .aac .adts | .flac |
| MIME | audio/aac | audio/flac |
About the formats
AAC
Advanced Audio Coding
AAC is the lossy audio codec developed as the successor to MP3. YouTube, Apple and streaming services use it; .aac files are a raw AAC stream.
FLAC
Free Lossless Audio Codec
FLAC is an open format that compresses audio to roughly half size without losing any quality. Music archivists and hi-fi listeners prefer it.
Frequently asked questions
Is converting AAC to FLAC free?
Yes, completely free. No account, no daily limit, no watermark and no queue.
Does it work on a phone?
Yes. It works on iPhone, iPad and Android, with no app to install.
Is there a file size limit?
There is no size limit set by us. Files of hundreds of MB convert too; very large files take longer and are handled more comfortably on a computer than on a phone.
Other conversions
| Family | Give | → | Get | What you gain |
|---|---|---|---|---|
| FLAC | AAC | broadcast-grade audio · smaller file | ||
| AAC | MP3 | plays on every device | ||
| AAC | WAV | lossless, ready to edit · larger file | ||
| AAC | M4A | better than MP3 at the same size | ||
| AAC | OGG | open and royalty-free | ||
| AAC | OPUS | most efficient for speech | ||
| WAV | FLAC | lossless at half size | ||
| MP3 | FLAC | lossless at half size · MP3 recording | ||
| M4A | FLAC | lossless at half size · iPhone voice memo | ||
| OGG | FLAC | lossless at half size · Telegram voice message | ||
| OPUS | FLAC | lossless at half size · WhatsApp voice note | ||
| WMA | FLAC | lossless at half size · old Windows Media audio |