Private AAC conversion
AAC to FLAC Converter
Decode AAC audio and save it in the lossless, metadata-friendly FLAC format without uploading your recording.
The processing engine downloads once from a CDN. Your AAC file stays on this device.
How to use the aac to flac converter
- STEP 1Choose an AAC audio file up to 200 MB.
- STEP 2Convert it locally to FLAC with FFmpeg WebAssembly.
- STEP 3Download the finished FLAC file.
About this tool
FLAC stores the decoded audio without introducing another lossy compression pass, making it useful for editing and archival workflows.
FLAC cannot restore detail already discarded by AAC compression, but future saves from the FLAC copy remain lossless.
Conversion time and memory use depend on the source duration, bitrate, and your device.
Frequently asked questions
Does FLAC improve AAC quality?
No. It preserves the decoded AAC signal without further lossy degradation, but cannot recreate frequencies or detail removed during the original AAC encode.
Is the AAC file uploaded?
No. FFmpeg WebAssembly runs the conversion in your browser. The processing engine is downloaded from a CDN, but your media stays on your device.
Is there a file-size limit?
Yes. The tool accepts AAC files up to 200 MB. Larger files can exceed browser memory limits.