FLAC to AAC Converter
Convert FLAC to AAC free — no upload, no signup
To convert FLAC to AAC, drop your FLAC audio files into the box below and click Convert. Fylo converts with ffmpeg running inside your browser, so nothing is uploaded and there's no signup or watermark. Compress FLAC into efficient AAC.
Drop audio files here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
Advanced
How to convert FLAC to AAC
Add your FLAC files
Drag and drop FLAC files into the box or tap to choose them. The converter engine (about 31 MB) downloads once, the first time you convert.
Pick a bitrate
192 kbps suits music and 128 kbps or less suits speech. Sample rate and mono/stereo are under Advanced.
Convert and download
Click Convert, then download each AAC file or all of them as one ZIP.
Why convert FLAC to AAC?
AAC gives excellent quality at small sizes for streaming and mobile playback.
What happens when you convert FLAC to AAC?
The FLAC is encoded to AAC at 160 kbps, about 85% smaller.
How does Fylo convert FLAC to AAC?
Fylo decodes the FLAC audio in the FLAC with ffmpeg compiled to WebAssembly and encodes it with FFmpeg's AAC encoder at 160 kbps, written as a raw ADTS stream. Going from lossless to lossy is where the big saving happens: a 3-minute song is ≈ 18–24 MB as FLAC but ≈ 3.6 MB at 160 kbps as AAC. The original sample rate and channel layout are kept unless you change them under Advanced.
What's the difference between FLAC and AAC?
FLAC (Free Lossless Audio Codec) was released in 2001 and later maintained by the Xiph.Org Foundation. It compresses PCM audio like a ZIP file compresses data: nothing is thrown away, so a FLAC decodes to exactly the same samples as the source WAV, typically at 50–70% of the size.
AAC (Advanced Audio Coding) was standardised in 1997 as part of MPEG-2 and later MPEG-4, designed to replace MP3. It achieves better quality at the same bitrate, especially below 128 kbps. A .aac file is usually a raw ADTS stream; the same audio inside an MP4 container is called M4A.
Learn more: FLAC format guide · AAC format guide
| Property | FLAC | AAC |
|---|---|---|
| Compression | Lossless | Lossy |
| Typical bitrate | ≈ 700–1,100 kbps | 96–256 kbps |
| 3-minute song | ≈ 18–24 MB | ≈ 3.6 MB at 160 kbps |
| Tags and cover art | Yes (with cover art) | Limited in raw .aac (full in M4A) |
| Compatibility | Android, Windows 10+, macOS, most players and hi-fi gear | Very wide: Apple, Android, YouTube, browsers |
| Best for | Archiving music without quality loss | Efficient music and video soundtracks |
| Introduced | 2001 | 1997 |
Frequently asked questions
AAC or M4A?
M4A is better for music libraries thanks to tag support.
Is AAC good enough for hi-fi?
At 256 kbps it's transparent for nearly everyone.
Is my FLAC file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your FLAC file is read directly from your device and never sent anywhere.
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