The design, implementation and deployment of a system to transparently compress hundreds of petabytes of image files for a file storage service

Lepton losslessly compresses an average JPEG image by about 23%. This is expected to save Dropbox more than 8% of its overall backend file storage. Lepton introduces new techniques that allow it to match the compression savings of prior work (PackJPG) while decoding more than nine times faster and in a streaming manner.