Convert AAC to FLAC.
Store an AAC file as FLAC for music servers, players and archives that only accept FLAC.
No further loss
Unlike converting AAC to MP3, converting to FLAC adds no second round of compression. Every later edit or conversion starts from the same decoded audio.
Smaller than WAV
If you need a lossless copy for editing, FLAC holds exactly the same audio as a WAV in roughly half the space.
Size change
The FLAC is several times larger than the AAC, because it stores every decoded sample.
How it works
- 01
Upload your AAC
Drop a file or pick one from your device. Private by default.
- 02
Convert with ffmpeg
ffmpeg decodes the AAC and stores the result losslessly as FLAC.
- 03
Download
Grab your FLAC.
Lossless FLAC of exactly what the AAC decodes to
Keeps the original sample rate and channels
Private uploads, auto-deleted after 1 hour
No watermark, no signup to try
Open-source ffmpeg engine
AAC to FLAC: no added loss
FLAC is a lossless format, so encoding into it adds no further quality loss. Note that if AAC was already lossy (like MP3 or AAC), detail discarded earlier can't be brought back. The FLAC is faithful to the AAC, just larger.
Need more than a conversion?
Send your audio or video to TranscriptAI to generate a transcript, summary, structured notes, flashcards, quiz questions or action items: automatically.
Common questions
Is it free?+
Yes. Convert AAC to FLAC free. No signup and no watermark. Free covers 10 server conversions a day, up to 100 MB a file. Pro removes the daily limit and raises the file limit to 2 GB.
Is my file private?+
Your file is uploaded to a private bucket, converted on our own engine, and auto-deleted after 1 hour. It is never sent to a third-party converter.
Will it sound better than the AAC?+
No. AAC is lossy, and FLAC cannot restore what the AAC encoder removed. FLAC stores the decoded audio without any further loss, so it sounds the same as the AAC.
Why convert, then?+
Some music servers, DJ software and archive workflows accept only FLAC. Converting lets an AAC file live alongside the rest of a FLAC library.
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