FLAC: Play and Convert Lossless Audio Files

FLAC - the Free Lossless Audio Codec - is the open-source format that compresses audio without throwing a single bit away.
 

A 100 MB WAV becomes a 50-60 MB FLAC, and decoding it gives you a byte-identical copy of the original.

Unlike MP3 or AAC, nothing is discarded.

That makes FLAC the right format for archiving music, hi-res downloads, and any library you might want to re-encode in the future.

It is royalty-free, formally standardised in IETF RFC 9639, and supported by virtually every player and device sold in 2026.

How to play FLAC files

Most modern players handle FLAC out of the box. VLC Media Player plays FLAC immediately after install with zero configuration.

foobar2000 adds gapless playback and ReplayGain for serious libraries, and Winamp remains a popular choice for large collections.

For system-wide FLAC support in Windows Media Player and any DirectShow app, install the K-Lite Codec Pack.

On phones, SpotiFLAC Mobile and MX Player both decode FLAC natively.

How to convert audio to FLAC

For converting a folder of WAV, MP3, or AAC files to FLAC on Windows 10 or 11, the recommended tool in 2026 is X FLAC Encoder - a free modern GUI built around the official flac.exe reference encoder, with parallel batch processing, ReplayGain tagging, cuesheet support, and 24/32-bit hi-res handling.
 

It replaces the long-running but ageing FLAC Frontend with a faster, more capable interface.

For ripping CDs to FLAC directly, Exact Audio Copy is the gold standard - bit-perfect extraction with AccurateRip verification. The lighter CDex is the friendlier alternative covered in the CD Ripping Guide.

For multi-format batch jobs, LameXP and the foobar2000 Free Encoder Pack wrap FLAC alongside LAME, Opus, and AAC encoders.

FLAC vs other lossless formats

FLAC has broader compatibility than Apple Lossless (ALAC) or Windows Media Audio Lossless. Monkey's Audio compresses slightly tighter but decodes slower and runs on far fewer devices.

For low-bandwidth streaming, voice, or podcasts, Opus sounds dramatically better than any lossless format at 64-96 kbps, but it is lossy by design.

For maximum portable-device compatibility, LAME MP3 is still the universal common denominator. The FLAC vs MP3 in 2026 guide goes deeper on the tradeoffs.

Who should use FLAC

Audiophiles archiving CD collections, anyone with a hi-res download library, professionals editing or mastering audio, and anyone who wants to re-encode the same source to MP3 or Opus later without compounding quality loss.

For everyday listening on phone speakers, FLAC is overkill - but for any source you only digitise once, it is the only format worth using.

Download FLAC for the official reference encoder, or X FLAC Encoder for the recommended GUI in 2026.

Read more here and here.