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Free Online M4B to FLAC Converter

Convert M4B audio to FLAC online for free.

Drop M4B files here
or click anywhere in this box to choose files

Max file size 50MB. Sign up for more.

When FLAC is the right output

FLAC is lossless audio compression — ~50% the size of WAV with mathematically identical audio. The audiophile format of choice: Tidal HiFi and Amazon Music HD stream FLAC, and vinyl-rip communities archive in it. Convert to FLAC when your destination is critical listening on capable gear, or long-term archival of source recordings.

M4B to FLAC FAQ

Quick answers about compatibility, quality, metadata handling, and the most common reasons to convert M4B files to FLAC.

How do I convert M4B to FLAC?
Upload your M4B audio to iFormat and click Convert. The track is decoded and re-encoded to FLAC with metadata preserved. It's free, needs no account, and supports batch conversion of albums or playlists.

How to convert M4B to FLAC without losing sound quality
FLAC is a lossless compressed audio format. Converting to a lossless target (WAV, FLAC, AIFF) preserves every detail of the original. Converting between lossy formats involves a small, usually inaudible re-encoding step. For the best result, always start from the highest-quality source file you have.

Can I convert multiple M4B files to FLAC at once?
Yes — upload an entire album or playlist of M4B files and iFormat batch-converts them all to FLAC. Metadata (title, artist, album, cover art) carries over for each track, so your library stays organised after conversion.

Does M4B to FLAC conversion keep track info like artist and album?
Yes — ID3 metadata such as title, artist, album, and cover art carries over automatically wherever the FLAC format supports it, so your library stays organised after conversion.

How do I open M4B files?
On Windows: iTunes, or any audiobook player that keeps chapter marks. On a Mac: Apple Books, natively. An audiobook container. It plays in most audio apps, but only audiobook-aware players keep the chapters and remember your position.

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