Convert AAC to FLAC
Free AAC to FLAC converter that runs entirely in your browser. No uploads, no signup required.
Drop AAC files here
or browse your device. Free, no signup required, no watermarks.
Files are processed on your device, never uploaded
Media conversions run on a full FFmpeg engine compiled to WebAssembly. The engine (~31 MB) downloads once on your first conversion, then everything runs locally.
Three steps
How to convert AAC to FLAC
Add your files
Drop AAC files into the box above, or click it to browse. Add several to batch convert.
Convert
FLAC is already selected as the output. Hit Convert. Your browser does the work locally.
Download
Save each converted FLAC file. Pro ZIPs whole batches in one click.
Advanced Audio Coding
AAC
AAC is the successor to MP3 with better quality at the same bitrate, used by YouTube and Apple Music.
Free Lossless Audio Codec
FLAC
FLAC compresses audio to about half the size of WAV with zero quality loss. It is the audiophile's archive format.
Why convert AAC to FLAC?
AAC is the successor to MP3 with better quality at the same bitrate, used by YouTube and Apple Music. FLAC compresses audio to about half the size of WAV with zero quality loss. It is the audiophile's archive format. Converting from AAC to FLAC gets you the best of the target format wherever AAC falls short, whether that's compatibility, file size, or what your apps and devices can open. With FormatFusion the switch takes seconds and your files stay on your device the whole time.
Questions
AAC to FLAC: common questions
Is this AAC to FLAC converter free?
Yes. It is completely free with no watermarks and no account required, for files up to 1 GB each. Convert one file or a hundred.
Is it safe to convert AAC files here?
Safer than any upload-based converter. The conversion runs locally in your browser, so your AAC files are never sent over the internet and never touch a server.
Will I lose quality converting AAC to FLAC?
No. This conversion preserves your content, and FLAC output keeps everything the format supports.
Can I convert multiple AAC files at once?
Yes. Free converts up to three AAC files at a time. FormatFusion Pro batches without limits and downloads whole runs as a single ZIP.
Does it work on iPhone and Android?
Yes. FormatFusion runs in any modern mobile or desktop browser. No app install needed.