FLAC to AAC converter
Convert FLAC to AAC free online. Compress lossless FLAC into compact AAC for streaming, mobile playback, and bandwidth-limited scenarios. No signup, 500 MB limit.
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About Advanced Audio Coding
Common Use Cases
- Creating compact versions of lossless archives
- Streaming and mobile playback from FLAC sources
- Producing AAC assets for web and app delivery
FLAC preserves every bit of your audio, but those files are large and not always practical for streaming, mobile devices, or web delivery. AAC is the modern lossy codec that powers Apple Music, YouTube, and most streaming platforms. It delivers better audio quality than MP3 at the same bitrate. Converting FLAC to AAC gives you compact, high-quality files from the best possible source.
FLAC is lossless and preserves every sample of the original audio, while AAC uses psychoacoustic compression to cut file size by 70-80% with minimal audible quality loss at higher bitrates.
Why Convert FLAC to AAC?
Best possible lossy encode
Encoding AAC from a lossless FLAC source produces the cleanest possible lossy output. No generational loss from a previous lossy encoding, just one clean conversion.
Compact files for mobile and streaming
A 30 MB FLAC track compresses to roughly 5-8 MB as AAC at 256 kbps. That fits many more songs on your phone and streams over slower connections.
Broad device and platform support
AAC plays on every Apple device, Android phone, modern browser, and most hardware players. It is the codec behind Apple Music, YouTube, and many streaming services.
Better than MP3 at the same bitrate
AAC consistently outperforms MP3 in listening tests at equal bitrates. At 128 kbps, AAC sounds roughly equivalent to MP3 at 160 kbps.
When to use each
Keep FLAC when...
- Archiving at full quality
- Editing or mastering audio
- Bit-perfect playback on hi-fi gear
- Storage space is not a concern
- Future re-encoding flexibility
Convert to AAC when...
- Mobile playback on limited storage
- Streaming over limited bandwidth
- Web delivery or app audio assets
- Sharing via email or messaging
- Platform requires AAC format
Common use cases
- Creating compact versions of lossless archives
- Streaming and mobile playback from FLAC sources
- Producing AAC assets for web and app delivery
How to use
- Upload your FLAC file. Drag and drop a .flac file onto the upload area, or click to browse from your device. Files up to 500 MB are supported.
- Start the conversion. Click Convert File. Your FLAC is decoded and encoded as AAC on our servers using FFmpeg.
- Download your AAC. Once processing finishes, click the download link to save your AAC file. Both the uploaded FLAC and converted output are deleted from our servers within 1 hour.
Frequently asked questions
- Does converting FLAC to AAC lose quality?
- Yes. AAC is lossy, so some audio data is discarded. At 256 kbps, the difference from the lossless source is inaudible to most listeners. Keep your FLAC files as masters.
- Is AAC better than MP3?
- Yes. AAC delivers better quality than MP3 at the same bitrate. At 128 kbps, AAC sounds roughly as good as MP3 at 160 kbps. The advantage grows at lower bitrates.
- Will metadata transfer?
- Yes. FFmpeg maps FLAC Vorbis comments to AAC/ADTS metadata. Standard tags like title, artist, and album are preserved.
- What is the difference between AAC and M4A?
- AAC is the codec; M4A is a container (MP4) that wraps AAC audio. Raw .aac files are bare streams. M4A files have better metadata and seeking support. Both use the same audio codec.
- Is converting FLAC to AAC free?
- Yes. Anyone can convert for free with no signup. Anonymous users have a daily cap, registered accounts get higher limits, and Premium or Lifetime members get unlimited conversions.
- Should I use AAC or M4A?
- For most uses, M4A is better because the container provides metadata support and proper seeking. Raw AAC is mainly used for streaming and broadcast insertion.
- Is there a file size limit?
- Yes. The maximum upload size is 500 MB.