AAC to FLAC Converter
Convert AAC and .m4a audio into a lossless FLAC file. Free, in your browser, no signup.
Drag & drop your AAC or M4A file here, or browse
Want your AAC audio in a lossless FLAC container? This free converter turns .aac and .m4a files into FLAC in seconds — no software or signup. Files up to 30MB are converted directly and nothing is stored after your download.
How to convert AAC to FLAC
1. Upload your AAC or M4A file
Drag a file onto the box above, or click to browse. Both .aac and .m4a are accepted.
2. FLAC is selected
FLAC is lossless, so there's no bitrate to choose — the quality setting doesn't apply.
3. Convert & download
Click Convert & Download. Your FLAC file downloads automatically.
Does FLAC make AAC lossless?
No. AAC is lossy — it has already discarded data that FLAC can't bring back. Converting AAC to FLAC gives you a lossless container around already-lossy audio; it won't restore the original master. FLAC only preserves full quality when you start from a lossless source. See AAC vs FLAC.
When is this useful?
It's handy when a device, editor, or workflow requires FLAC and you only have AAC — you get a compatible file without adding another round of lossy compression. Just don't expect it to improve on the AAC you started with.
Frequently Asked Questions
How do I convert AAC to FLAC?
Upload your .aac or .m4a file, keep FLAC selected, then click Convert & Download. The FLAC file is created and downloaded automatically.
Does converting AAC to FLAC make it lossless?
No. AAC already discarded data that FLAC can't recover. You get a lossless container around lossy audio, not the original master.
Why would I convert AAC to FLAC?
Mainly for compatibility — when a device or workflow needs FLAC and you only have AAC. It avoids adding another round of lossy compression.
Is the AAC to FLAC converter free?
Yes — it's completely free, with no account, no watermarks, and no limit on how many files you convert.