foobar2000 (often abbreviated as fb2k or f2k) is a freeware audio player for Microsoft Windows, iOS and Android developed by Peter Pawłowski. It has a modular design, which provides user flexibility in configuration and customization. Standard "skin" elements can be individually augmented or replaced with different dials and buttons, as well as visualizers such as waveform, oscilloscope, spectrum, spectrogram (waterfall), peak and smoothed VU meters. foobar2000 offers third-party user interface modifications through a software development kit (SDK).
foobar2000 supports many s, has many features for organizing metadata, files, and folders, and has a converter interface for use with command line encoders. To maximize audio fidelity in cases where resampling or downscaling in bit depth is required, it provides noise shaping and dithering. There are a number of official and third-party components which add many additional features. The core is closed source, whereas the SDK is licensed under the Three-Clause BSD license.
foobar2000 was first released in 2002 and developed by Peter Pawłowski, who had previously worked at Nullsoft and developed plugins for Winamp. He created foobar2000 with the audiophile community in mind. The software's mascot and logo icon consists of a white "alien cat".
foobar2000 supports Windows, though the support of older versions for Windows XP and Vista has been dropped as of version 1.6 (released 2020). Windows 2000 support was dropped as of version 0.9.5 (released 2008) and Windows 95/98/ME/NT4 support was dropped as of version 0.9 (released 2006).
foobar2000 versions since 0.9.5 feature a revamped default interface, with embedded support for album list, album art, spectrum visualization, and some other features and improvements.
In May 2016, versions for mobile devices were released, and in January 2018, an early beta version for macOS was released.
In August 2022, a beta version of foobar2000 v2.0 was released with 64-bit support, Dark mode, and hardware-accelerated visualizations.
Version 2.