WinLep compresses JPEG images to LEP. This compression format called Lepton allows the compression of JPEG images saving on average a 22% of size without losing quality in the process of compression and when it is decompressed the image is exactly the original one.
Lepton is a lossless open source algorithm developed by Dropbox capable of compressing images at 5 MB/s and decompressing them at 15 MB/s. WinLep takes advantage of these qualities to offer a fast and lossless quality compressor/decompressor.
WinLep compresses JPEG and decompresses LEP, moreover it can display JPEG and LEP compressed files.