Lepton is a tool and file format for actively compressing JPEGs. First developed by Daniel Horn at a Dropbox Hack Week, this streaming image compression format achieves a 22% savings reduction for existing JPEG images, while preserving the original file bit-for-bit perfectly. At Dropbox, we've used Lepton to encode more than 16 billion images, and have saved multiple petabytes of space. In July of 2016, Lepton was made available as open source under the Apache License.
