Lepton

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File Format
Name Lepton
Ontology
Extension(s) .lep, .ujg
Released 2016

Lepton is a special-purpose compression algorithm and file format, developed by Dropbox. It only compresses JPEG files.

Identification

Files begin with 0xcf 0x84 (lepton), or 0xce 0xb6 (zlib compressed lepton).

The lepton software appears to also support a format it calls "UJG", which starts with ASCII "UJ".

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