# Calibre 9.17 adds JPEG XL cover support, faster e-book conversion

> **Key takeaway:** Calibre 9.17 introduces JPEG XL image support for e-book cover conversion and improves conversion speed for MOBI, AZW3 and PDB formats.

**Published:** 2026-10-23T04:35:26+00:00 
**Source:** 9to5Linux 
**Category:** distro-news 
**Canonical URL:** https://fosswire.org/news/calibre-917-adds-jpeg-xl-cover-support-faster-e-book-convers.html 

## Summary
Calibre 9.17 is now available as a free download. The open-source e-book manager adds JPEG XL support specifically for cover image conversion, and speeds up conversion to Amazon's MOBI and AZW3 formats as well as PDB. These are incremental improvements to a widely used tool for managing digital libraries.

## What changed in Calibre 9.17
- **JPEG XL support**: Newly added for e-book cover conversion, not general image handling
- **Faster conversion**: MOBI, AZW3 and PDB output formats see performance improvements
- **Release cadence**: Follows Calibre's typical frequent point-release schedule

## Why it matters
JPEG XL adoption in Calibre may encourage publishers and archivists to use the royalty-free format for cover images, though browser support for the format remains uneven.