FLAC to AAC Converter
AAC provides the best lossy compression quality available, and starting from a lossless FLAC source ensures optimal encoding results. Converting FLAC to AAC creates compact, high-quality audio files perfect for Apple devices, iTunes, and modern streaming workflows.
Converting from FLAC to AAC produces the best possible AAC quality since the encoder works from a perfect lossless source. At 256kbps, the result is virtually indistinguishable from the original.
How to Convert FLAC to AAC
- 1
Upload your FLAC file.
- 2
Select AAC as the output format.
- 3
Click Convert and download the AAC file.
FLAC vs AAC — Format Comparison
| Feature | FLAC | AAC |
|---|---|---|
| Full Name | Free Lossless Audio Codec | Advanced Audio Coding |
| Type | Audio | Audio |
| Codec | FLAC | AAC-LC / HE-AAC / AAC-ELD |
| Lossless | Yes | No |
| Extension | .flac | .aac |
| Best For | Audiophile music collections | Apple Music and iTunes |
FLAC Strengths
- 100% lossless — bit-for-bit identical to original
- Open source and royalty-free
- 50-60% smaller than uncompressed WAV
AAC Strengths
- Better quality than MP3 at same bitrate
- Native support on Apple devices and iTunes
- Default audio codec in MP4 video containers
Frequently Asked Questions
When to Convert FLAC to AAC
- Creating Apple-optimized audio from lossless collections
- Preparing music for iTunes and Apple Music
- Building compact high-quality audio libraries for iOS devices
- Audio production for Apple ecosystem apps
Related Conversions
About Our FLAC to AAC Converter
This converter uses FFmpeg compiled to WebAssembly (WASM) to transform your FLAC files into AAC format entirely inside your web browser. When you select a file for conversion, the processing happens locally on your device. Your file is never uploaded to any server, never transmitted over the internet, and never stored anywhere outside your own computer. This privacy-first architecture makes our tool safe for confidential and sensitive content — including legal recordings, medical files, financial presentations, personal media, and any other material you would not want on a third-party server.
The conversion process works by decoding the FLAC input using FFmpeg's highly optimized decoders, then encoding the output in AAC format with carefully tuned settings that balance quality and file size. When possible, the tool uses stream copy mode to remux (rewrap) compatible streams without re-encoding, which preserves the original quality with zero generational loss. When re-encoding is necessary due to codec differences between the two formats, the converter uses high-quality encoding settings to minimize any visible or audible quality reduction.
Supported input formats include MP3, WAV, AAC, FLAC, and OGG for audio, with automatic detection of the codecs and parameters inside your source file. The output is optimized for maximum compatibility with modern devices and platforms including Windows, macOS, Linux, iOS, Android, smart TVs, and all major web browsers.
Why browser-based conversion is safer: traditional online converters require you to upload your file to a remote server, where it is processed by third-party infrastructure and then made available for download. This workflow exposes your data to interception during upload, unauthorized access on the server, unclear data retention policies, and potential data breaches. Professionals in regulated industries such as healthcare (HIPAA), legal (attorney-client privilege), and finance (SOX, GDPR) often cannot use server-based converters without violating compliance requirements. Our WebAssembly-powered approach eliminates all of these risks by ensuring your data never leaves the browser sandbox on your own device.
The tool handles files up to 500 MB on desktop browsers and 200 MB on mobile devices. No account registration, no software installation, and no recurring subscription is required. Conversion typically completes in seconds for small files and a few minutes for larger ones, depending on your device's processing capabilities. Once the conversion is finished, you can download the result immediately and the source data is discarded from browser memory.