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FLACSoX
Free

Free and open source; libraries under BSD-3-Clause and tools under the GPL.

 Free

Free and open source under GPL-2.0 and LGPL licences.

Windows, Command line Windows, macOS, Linux, Command line
  • Reference implementation of an open, patent-free format
  • Lossless compression with bit-exact decoding
  • Converts between many audio file formats
  • Applies effects and filters during conversion
  • Command-line only; needs a separate front end for a GUI
  • Lossless files remain larger than MP3 or AAC
  • Command line only, with no graphical interface
  • Infrequent releases
Downloadable app Downloadable app
Open source Open source
License: BSD-3-Clause, GPL-3.0-or-later License: GPL-2.0-or-later AND LGPL-2.1-or-later
No account needed No account needed
Works offline Works offline

Checked October 2, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.