JPEG-LS

Writable

image

A standard for lossless or near-lossless compression of images, also known as ISO/IEC 14495-1 and ITU Recommendation T.87, created by the Joint Photographics Experts Group (JPEG). It was developed as a low complexity lossless image compression standard in 1999, and was based on LOCO-I algorithm. JPEG-LS also provides a lossy mode. It has faster compression than JPEG 2000 and is considered better than the original lossless JPEG standard.

Identify it

Extensions	`.jls`
MIME types	`image/jls`
Signatures	`ffd8fff700` at byte 0
PRONOM	`fmt/150`
Wikidata	`Q2190356`
Library of Congress	`fdd000151`

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thorfdbg/libjpegOpen sourcereads and writes · GNU General Public License, version 3.0
IrfanViewreads and writes · freeware

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Sources

From Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.

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