Calibre 9.17 Review: The E-Book Workhorse Learns New Tricks
Calibre still looks like a cockpit, but version 9.17 makes the whole thing faster, friendlier and nicer to listen to.
Anyone with more than a handful of e-books on their PC ends up asking the same question sooner or later: where do I keep all this stuff? For more than fifteen years, the answer from the open-source world has been calibre. It catalogues, converts, edits, syncs, downloads news and even reads aloud. The developer counts more than three million active installs. Version 9.17 landed on October 23, and together with the 9.16 update from earlier in October it brings a set of changes that make a fresh look worthwhile, even if you wrote calibre off years ago because of its busy interface.
First impressions and installation
The Windows download is an MSI package of roughly 240 MB, offered in 64-bit only. Calibre 9 needs Windows 10 version 1809 or newer. If you're still on an older system, the project points you to older releases, such as calibre 5.44 for Windows 8. A portable build exists too: it keeps your library and settings in one folder, so you can carry the whole thing around on a USB stick and start it with calibre-portable.exe.
The installer is pleasantly boring. There are no bundled extras, no account and no subscription. Calibre is free under the GPL v3, and the project lives on donations. On first launch, a welcome wizard asks where your library should live and which e-reader you use, so calibre can pick the right output format for conversions later.
Then the main window opens, and that's the moment when some newcomers get a little nervous. A wide toolbar runs across the top: Add books, Edit metadata, Convert books, View, Get books, Fetch news, Send to device, Connect/share, Remove books, Preferences and more. The Tag browser sits on the left, the book list in the middle and the Book details panel on the right. It looks like a lot, and it is a lot. But after half an hour, most of it makes sense, because every button does exactly what it says.
Your library, now on a bookshelf
The biggest visual change in the 9.x series arrived with calibre 9.0 in January: the Bookshelf view. Click the Layout button at the bottom right of the window and switch it on, and instead of a spreadsheet of titles you see your books as spines lined up on shelves. It's a small thing, but browsing a big collection suddenly feels a lot more like standing in front of a real bookcase than scrolling through a database.
The Bookshelf view from the calibre 9 series, here in dark mode with the Book details panel.
The classic list and the Cover grid are still there, of course, and the Tag browser remains the real power tool. Filter by author, series, tag, format or rating with a click, or set up Virtual libraries so your comics, textbooks and novels each get their own view. If you drag a folder full of EPUB and PDF files onto the window, calibre imports everything. Through Edit metadata you can then download covers, descriptions and series information. Version 9.17 has also fixed the Amazon and Google Images metadata sources, which had stopped working.
For people with really large libraries, 9.17 brings something practical: adding books and starting calibre are faster when the Tag browser is hidden. Version 9.16 had already sped up several operations on big libraries. I can't give you a stopwatch figure here, but the direction is clear and it targets exactly the users who have complained about long startup times.
Converting and editing: the engine room
Format conversion is the reason many people install calibre in the first place. Select a book, hit Convert books, pick a target format such as EPUB, AZW3 or PDF, and calibre does the rest in the background. The Jobs indicator at the bottom shows what's running. Version 9.17 adds support for reading JPEG XL images during conversion and handles CSS Level 4 selectors. Compression for MOBI, AZW3 and PDB output is faster too, which helps if you regularly push books to an older Kindle. Version 9.16 had added AVIF images and better handling of right-to-left text and multi-column layouts in PDF input.
If a book has broken formatting, a typo in the table of contents or an ugly cover, Edit book opens the built-in e-book editor. It has a file browser, a code view, Live preview and Live CSS. The Check book function scans for errors and fixes many of them automatically, and since 9.17 it also finds dangling ARIA references, which matters for accessible e-books. For casual readers this is overkill. For anyone who makes their own EPUBs, it's a real reason to stick with calibre.
One thing calibre doesn't do is remove DRM. The project says so plainly in its FAQ: most purchased EPUB books have DRM, and that stops calibre from opening them. DRM-free books from many shops, public-domain titles and your own documents all work fine.
Reading, listening and sharing
Double-click a book and calibre's own E-book viewer opens. It has a table of contents, highlights, bookmarks, a reference mode and printing. The feature I'd point most people to right now is Read aloud. Since 9.16, calibre supports the Kokoro voices, which the developer says sound much more natural than the older Piper voices, especially in English. You choose them through the Neural engine backend, and each voice downloads automatically the first time you use it. Natural-sounding text-to-speech that runs locally and costs nothing is a strong offer.
The E-book viewer with the table of contents panel. This official screenshot comes from an older calibre version, and the layout has stayed close to it.
Calibre 9.0 also added AI features: you can discuss a book with an AI, ask for suggestions about what to read next, or use "Ask AI" in the viewer. These features are opt-in. They support cloud and local providers, and no AI code loads until you configure a provider. If you'd rather not see them at all, a tweak hides every AI feature completely. That's a respectful way to add AI to a tool many people use for private reading.
Click Connect/share and the Content server starts. It lets you read your library in a browser on any device on your network, offline if needed. Send to device handles e-readers connected by cable or wirelessly, and Fetch news turns news sites and RSS feeds into e-books you can read on your e-reader every morning.
How it compares
Sigil is the better choice if you only care about editing EPUB files. It's a dedicated, free and open-source EPUB editor, but it doesn't manage a library. Icecream Ebook Reader goes the other way: it's a clean, simple reader with a basic library, and it's much easier to get into than calibre. It offers nothing like calibre's conversion engine, metadata tools or device sync. Alfa Ebooks Manager is aimed at collectors who want a good-looking catalogue, but it's a commercial product. Calibre gives you more for free than any of them, and the price you pay is a steeper learning curve.
Pros and cons
Pros
- Free, open source and free of ads, accounts and bundled extras
- Converts almost any e-book format, with an editor that can fix broken books
- New Kokoro voices make Read aloud sound natural, all running locally
- Bookshelf view and faster startup in large libraries make daily use nicer
- AI features are strictly opt-in and can be hidden entirely
Cons
- The crowded main window takes time to learn
- Large download of about 240 MB
- Can't open DRM-protected books
- Frequent updates every few weeks can feel like a lot
Our verdict
Calibre 9.17 isn't a revolution, but it doesn't need to be. Together with 9.16, it adds natural-sounding voices, new image formats, faster handling of huge libraries and a long list of fixes. Anyone who already uses calibre should update without thinking twice, especially if they listen to books or keep thousands of titles. Newcomers who mostly read a few books on a single device might be happier with a simpler reader. Everyone who juggles several formats, e-readers or self-made EPUBs will find nothing that comes close for free. The interface still looks like a control room, and that's the only thing holding it back from full marks.
UpdateStar rating: 4.5/5
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