wavelet2d is a set of C++ libraries for 1D/2D (decimated and stationary) discrete wavelet transforms. This implementation is geared towards students and others who want to implement simple DWT routines as part of their bigger projects. In order to speed up the implementation, these libraries are implemented using FFT routines from the FFTW3 library. Example code and documentation are available. The libraries are made available in the form of Win32 MSVC++ DLLs, Win32 MinGW DLLs and static libraries, and Linux shared and static libraries.