Convert aac to flac
Converted on your device. Files never leave this tab. Output tops out around 2 GB.
Nothing is uploaded
The converter runs inside this page. Cut your network after it loads and it still works.
No account, no daily limit
No sign-up, no daily limit, no watermark, no queue behind other people's files. Batch as many AAC files as you like.
Real FLAC output
Encoded by ffmpeg, the same library the command-line tools use — not a renamed extension.
About AAC
Advanced Audio Coding
The lossy codec standardized in MPEG-2 and MPEG-4 as a successor to MP3, generally sounding better at the same bitrate. A .aac file is a bare ADTS stream without the MPEG-4 container an M4A has. Use it for players and streaming tools that want a raw AAC stream; for a music library, M4A holds the same audio with better tagging.
About FLAC
Free Lossless Audio Codec
A lossless codec from Xiph.Org, first released in 2001, that typically shrinks CD audio to 50 to 70 percent of its WAV size and decodes to identical samples. Use it to archive music and CD rips without losing any quality.