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Calibre 9.17 E-Book Manager Adds JPEG XL Support and Performance Improvements

Written By
MN
Marcus Nestor
Nov 4, 2026

Coming two weeks after Calibre 9.16, the Calibre 9.17 release improves e-book cover conversion with support for reading images in the JPEG XL format and support for CSS Level 4 selectors, and improves compression of the MOBI/AZW3/PDB Output to make conversion to these formats faster.
MN

Marcus Nestor

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