Importing and exporting of WAV, AIFF, MP3 (via the LAME encoder, downloaded separately),
Ogg Vorbis, and all file formats supported by libsndfile library. Versions 1.3.2 and later
support Free Lossless Audio Codec (FLAC). Version 1.3.6 and later also support additional
formats such as WMA, AAC, AMR and AC3 via the optional FFmpeg library.
Recording and playing back sounds
Editing via Cut, Copy and Paste (with unlimited levels of Undo)
A large array of digital effects and plug-ins. Additional effects can be written with Nyquist
Built-in LADSPA plug-in support. VST support available through an optional VST Enabler.
Amplitude envelope editing
Noise Removal based on sampling the noise to be removed. Surface noise
from records, for example, can be removed with hardly any discernible effect.
Audio spectrum analysis using the Fourier transformation algorithm
Support for multi-channel modes with sampling rates up to 96 kHz with 32 bits per sample
Precise adjustments to the audio's speed while maintaining pitch (Audacity
calls it changing tempo), in order to synchronize it with video or run for a predetermined length of time
Changes to the audio's pitch without changing the speed
Features of modern multi-track audio software including navigation controls,
zoom and single track edit, project pane and XY project navigation, non-destructive
and destructive effect processing, audio file manipulation (cut, copy, paste)
Conversion of cassette tapes or records into digital tracks by automatically
splitting the audio source into multiple tracks based on silences in the source material
Support for multiple platforms — Audacity works on Windows, Mac OS X, and
Unix-like systems (including Linux and BSD), and on other platforms.
The latest stable version supports Windows 98/ME/2000/XP/Vista, but Windows
95 and NT are not supported. Windows 7 support is still provisional. For Windows 7,
the developers recommend the latest 1.3.x Beta
Audacity uses the wxWidgets software library to provide a similar graphical user interface on several different operating systems.