M4A to FLAC
Convert M4A to FLAC.
Convert M4A to FLAC.
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Tool guide
Free Online M4A to FLAC Converter
Convert one supported M4A file into FLAC in your browser. M4A may contain lossy AAC or lossless ALAC audio, so creating FLAC avoids another lossy output encode but cannot restore information already removed from an AAC source.
Steps
How it works
- Choose one M4A file up to 150 MB.
- Preview the source and review its duration.
- Decode the supported M4A audio and encode the result as FLAC.
- Preview and download the generated FLAC file.
Highlights
Key features
- Validates M4A input before processing.
- Creates FLAC output with FFmpeg's default lossless encoder settings.
- Supports AAC or ALAC content where the browser FFmpeg build can decode it.
- Shows progress, source and output previews, duration, and output size.
- Uses the M4A filename as the base for the FLAC download.
Use cases
Common uses
- Create a FLAC intermediate from an unprotected M4A recording.
- Use supported M4A audio in software that requires FLAC.
- Avoid another lossy generation in a later editing workflow.
- Move ALAC or AAC audio into a FLAC-based library when compatibility requires it.
Notes
Limitations to know
- AAC-to-FLAC does not restore detail discarded by AAC compression and is not a quality upgrade.
- ALAC-to-FLAC can use a lossless source, but bit-perfect parameter preservation is not verified.
- Only one file is processed per run; batch, bulk, and ZIP conversion are unsupported.
- DRM-protected files cannot be converted, and this tool does not remove copy protection.
- There are no compression, sample-rate, bit-depth, channel, metadata, or artwork controls.
FAQ
Frequently asked questions
Is every M4A-to-FLAC conversion lossless?
No. M4A can contain AAC or ALAC. AAC is already lossy, while ALAC is lossless; FLAC cannot recover information missing from AAC.
Will FLAC improve AAC quality?
No. FLAC preserves the decoded result without another lossy codec, but it cannot recreate discarded AAC detail.
Can it convert protected Apple audio?
No. DRM-protected audio is unsupported and the converter does not bypass copy protection.
Can I bulk convert M4A files?
No. The current tool processes one M4A file at a time, up to 150 MB.
Will tags and album artwork transfer?
The FFmpeg command does not explicitly map metadata or embedded artwork, so they may not be retained.