Calibre 9.3 E-Book Manager Released with KEPUB Improvements

Calibre 9.3: The E-Book Manager That Just Keeps Getting Smarter

In the ever-evolving world of e-book management, Calibre continues to stand tall as the open-source juggernaut that readers and librarians alike swear by. With the release of version 9.3, the Calibre team has delivered yet another maintenance update that not only fixes nagging issues but also enhances the overall user experience across platforms. This is the third update in the 9.x series, and it’s packed with improvements that make managing your digital library smoother than ever.

For Windows users, this update brings a particularly welcome change. The installer now intelligently detects if Calibre is running and prompts you to close it before proceeding. This seemingly small tweak eliminates the frustrating need for a system reboot after installation, saving time and reducing friction. But that’s not all—several Windows-specific regressions from earlier 9.x versions have been squashed. Issues like improper exit when using the wireless device driver, mismatched tooltips in the color scheme, and annoying error popups when launching the app multiple times quickly have all been addressed. These fixes might seem minor, but they add up to a noticeably more polished experience.

On the e-book conversion front, Calibre 9.3 brings some significant improvements. KEPUB output now preserves the cover aspect ratio during conversion, aligning with the behavior of Kobo devices. This ensures that your e-books look exactly as intended, without any awkward stretching or distortion. Additionally, a regression from Calibre 9.0 that affected output to PDB, TCR, and zTXT formats has been resolved, restoring full compatibility with these older formats.

PDF handling has also seen a boost. The update restores accurate PDF Outline to Table of Contents conversion when using the Calibre engine, making it easier to navigate complex documents. ODT and PDB input handling have been improved to ensure that extracted images remain within the container, addressing critical security vulnerabilities CVE-2026-26064 and CVE-2026-26065. These fixes not only enhance functionality but also bolster the security of your e-book library.

The release doesn’t stop at bug fixes and security patches. Calibre 9.3 introduces several user-facing enhancements. The new pages column is now available in save-to-disk and send-to-device templates, giving users more control over how their e-books are organized and transferred. Metadata file transfer issues with the Hanvon N10 device driver have been resolved, ensuring seamless synchronization with this popular e-reader. The Amazon metadata download plugin now correctly retrieves series index information, and page counting errors when adding books via the calibredb command have been fixed.

One of the more subtle but impactful changes is the refinement of the Preferences > Tweaks section. The need for double-apply actions has been eliminated, streamlining the customization process. This might seem like a small detail, but it’s the kind of thoughtful improvement that makes Calibre a joy to use.

News source support has also been updated for Financial Times, The Asahi Shimbun, and Todoist, ensuring that users can stay up-to-date with their favorite publications directly within Calibre. These updates keep the tool relevant in an increasingly connected world, where access to timely information is paramount.

For those eager to dive into the details, the full changelog is available on the Calibre website. The update is already rolling out for Windows, macOS, and Linux, so there’s no need to wait to experience these improvements.

Calibre 9.3 is a testament to the dedication of its developers and the vibrant community that supports it. By addressing both major and minor issues, the update ensures that Calibre remains the go-to tool for e-book management. Whether you’re a casual reader or a digital librarian, this release has something to offer. So, update your Calibre today and enjoy a smoother, more secure, and more feature-rich e-book management experience.

Tags: #Calibre #EbookManager #OpenSource #DigitalLibrary #TechUpdate #Windows #MacOS #Linux #eBookConversion #SecurityFix #BugFix #UserExperience #TechNews #SoftwareUpdate

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