{"slug": "calibre", "name": "Calibre", "category": "media", "category_name": "Media and creative", "description": "Open source ebook manager for organizing libraries, converting formats, and syncing e-readers.", "recommenders": 6, "commenters": 9, "warners": 1, "score": 5.213, "rising": -0.64, "first": "2026-06-15", "latest": "2026-09-07", "why": "Recommended for managing ebook collections, converting between formats, and sending books to e-readers such as Kobo, including over wifi.", "why_is_quote": false, "has_verdict": true, "sentiment": {"recommend": 6, "neutral": 2, "compare": 0, "warn": 1}, "spark": [0, 0, 0, 0, 0, 0, 0, 2, 3, 0, 1, 0], "listed": true, "loved": ["E-reader syncing", "Library management"], "caveat": "Clunky UI", "short_quote": "There is a very good open source conversion tool called \"Calibre\". I use it all the time", "icon": true, "domain": null, "github_repo": null, "official_url": "https://calibre-ebook.com", "pricing": "open source", "aliases": ["Calibre", "calibre"], "verdict": [{"text": "Recommended for managing ebook collections,", "cites": [{"id": 780966752, "item_id": 48810422, "url": "https://news.ycombinator.com/item?id=48810422", "by": "asveikau", "date": "2026-07-06", "stance": "recommend", "quote": "I would recommend looking into calibre for managing such titles.", "excerpt": "Came here to complain about this workflow too. If you don't want to resort to piracy, there are many vendors that sell epubs with weak DRM and presumably give money to publishers. Ebooks.com is one. If you have not already, I would recommend looking into calibre for managing such titles. (I did this even when I used to buy from Kindle, first thing I would do is break the DRM and put it into calibre even if I was only", "context": "", "use_case": "managing ebooks", "switched_from": "", "story": "What does Jeff Bezos think is going to happen?"}, {"id": 785986848, "item_id": 49124178, "url": "https://news.ycombinator.com/item?id=49124178", "by": "al_borland", "date": "2026-07-31", "stance": "neutral", "quote": "I have ebooks in Calibre, which I use to sync them over to the Kobo.", "excerpt": "I have a Kobo which has worked well enough for me. I have ebooks in Calibre, which I use to sync them over to the Kobo. I think I have the Clara. There are a couple ways the Kobo will render an ebook. If not in a Kobo format, it is pretty ugly, so converting them is worth it. I read thousands of pages before realizing this.", "context": "", "use_case": "ebook library and syncing", "switched_from": "", "story": "Ask HN: What E-Reader to Buy?"}, {"id": 792194480, "item_id": 49512155, "url": "https://news.ycombinator.com/item?id=49512155", "by": "Night_Thastus", "date": "2026-08-31", "stance": "neutral", "quote": "you can also load them manually through something like Calibre if you already have a collection of ebooks", "excerpt": "I got the Libra Color awhile back. I rediscovered my love of reading. Chewed through dozens of Star Trek books (some are quite good!). And a comic, which surprised me with the color and resolution the Libra offered. The store seems to work well and the prices are pretty cheap, but you can also load them manually through something like Calibre if you already have a collection of ebooks. I love how thin and light it is", "context": "", "use_case": "loading ebooks onto e-reader", "switched_from": "", "story": "Rakuten Kobo returns to U.S. retail as sales double"}]}, {"text": " converting between formats,", "cites": [{"id": 780961536, "item_id": 48810096, "url": "https://news.ycombinator.com/item?id=48810096", "by": "lpapez", "date": "2026-07-06", "stance": "recommend", "quote": "There is a very good open source conversion tool called \"Calibre\". I use it all the time", "excerpt": "There is a very good open source conversion tool called \"Calibre\". I use it all the time to convert my, erm, security backups of books I own.", "context": "", "use_case": "converting ebooks", "switched_from": "", "story": "What does Jeff Bezos think is going to happen?"}, {"id": 785986848, "item_id": 49124178, "url": "https://news.ycombinator.com/item?id=49124178", "by": "al_borland", "date": "2026-07-31", "stance": "neutral", "quote": "I have ebooks in Calibre, which I use to sync them over to the Kobo.", "excerpt": "I have a Kobo which has worked well enough for me. I have ebooks in Calibre, which I use to sync them over to the Kobo. I think I have the Clara. There are a couple ways the Kobo will render an ebook. If not in a Kobo format, it is pretty ugly, so converting them is worth it. I read thousands of pages before realizing this.", "context": "", "use_case": "ebook library and syncing", "switched_from": "", "story": "Ask HN: What E-Reader to Buy?"}]}, {"text": " and sending books to e-readers such as Kobo, including over wifi.", "cites": [{"id": 776615360, "item_id": 48538460, "url": "https://news.ycombinator.com/item?id=48538460", "by": "ornornor", "date": "2026-06-15", "stance": "recommend", "quote": "use calibre with the kobo plugin", "excerpt": "I don\u2019t miss my kindle, at all. Its text layout engine was a joke (every page edge was ragged!), you depend very heavily on amazons goodwill to keep allowing you, the device owner, to sideload your own books, it\u2019s getting harder to install third party software, and well that one is personal but it\u2019s from Amazon. I\u2019ve switched to kobos (Clara HD) and I\u2019ve had to for years. It\u2019s chugging along (had to 3d print a replac", "context": "", "use_case": "ebook management with Kobo", "switched_from": "", "story": "Your ePub Is Fine. Kobo Disagrees. Blame Adobe"}, {"id": 785560528, "item_id": 49097533, "url": "https://news.ycombinator.com/item?id=49097533", "by": "brokegrammer", "date": "2026-07-29", "stance": "recommend", "quote": "I use Calibre to send books over wifi.", "excerpt": "I installed it and I use Calibre to send books over wifi. Simple and sweet setup.", "context": "", "use_case": "sending books to e-reader", "switched_from": "", "story": "KOReader"}, {"id": 785986848, "item_id": 49124178, "url": "https://news.ycombinator.com/item?id=49124178", "by": "al_borland", "date": "2026-07-31", "stance": "neutral", "quote": "I have ebooks in Calibre, which I use to sync them over to the Kobo.", "excerpt": "I have a Kobo which has worked well enough for me. I have ebooks in Calibre, which I use to sync them over to the Kobo. I think I have the Clara. There are a couple ways the Kobo will render an ebook. If not in a Kobo format, it is pretty ugly, so converting them is worth it. I read thousands of pages before realizing this.", "context": "", "use_case": "ebook library and syncing", "switched_from": "", "story": "Ask HN: What E-Reader to Buy?"}, {"id": 793606225, "item_id": 49600389, "url": "https://news.ycombinator.com/item?id=49600389", "by": "beej71", "date": "2026-09-07", "stance": "recommend", "quote": "Crosspoint integration with Calibre.", "excerpt": "I have an X4. I've read about 15 books on it so far, and I carry it everywhere. I used to read books on my phone (Moon Reader), but it wasn't as compelling. I think it was a combination of the screen and the fact that I'm used to using the phone for other things. But I can't really pin it down more than that. Things I like: Flashable firmware. If they disable this capability, I wouldn't buy it. I'm using Crosspoint R", "context": "", "use_case": "ebook management", "switched_from": "", "story": "Tiny $70 Xteink X3 e-reader"}]}, {"text": " The main complaint is a clunky interface, with one commenter calling the UI godawful.", "cites": [{"id": 792182768, "item_id": 49511423, "url": "https://news.ycombinator.com/item?id=49511423", "by": "cosmic_cheese", "date": "2026-08-31", "stance": "warn", "quote": "Calibre may be functional, but its UI is godawful", "excerpt": "They\u2019re also just more user friendly in general. I have a nearly decade old Kobo that still serves its purpose well and I love how it shows up as a mass storage device when plugged into my computer. No clunky management software (Calibre may be functional, but its UI is godawful) or file conversions required, you just manage plain old epubs in your file browser. That functionality can\u2019t randomly vanish one day, eithe", "context": "", "use_case": "ebook management", "switched_from": "", "story": "Rakuten Kobo returns to U.S. retail as sales double"}]}], "praise": [{"label": "E-reader syncing", "summary": "Commenters use it to load and sync books onto Kobo and other e-readers, including over wifi.", "quotes": [{"id": 785986848, "item_id": 49124178, "url": "https://news.ycombinator.com/item?id=49124178", "by": "al_borland", "date": "2026-07-31", "stance": "neutral", "quote": "I have ebooks in Calibre, which I use to sync them over to the Kobo.", "excerpt": "I have a Kobo which has worked well enough for me. I have ebooks in Calibre, which I use to sync them over to the Kobo. I think I have the Clara. There are a couple ways the Kobo will render an ebook. If not in a Kobo format, it is pretty ugly, so converting them is worth it. I read thousands of pages before realizing this.", "context": "", "use_case": "ebook library and syncing", "switched_from": "", "story": "Ask HN: What E-Reader to Buy?"}, {"id": 776615360, "item_id": 48538460, "url": "https://news.ycombinator.com/item?id=48538460", "by": "ornornor", "date": "2026-06-15", "stance": "recommend", "quote": "use calibre with the kobo plugin", "excerpt": "I don\u2019t miss my kindle, at all. Its text layout engine was a joke (every page edge was ragged!), you depend very heavily on amazons goodwill to keep allowing you, the device owner, to sideload your own books, it\u2019s getting harder to install third party software, and well that one is personal but it\u2019s from Amazon. I\u2019ve switched to kobos (Clara HD) and I\u2019ve had to for years. It\u2019s chugging along (had to 3d print a replac", "context": "", "use_case": "ebook management with Kobo", "switched_from": "", "story": "Your ePub Is Fine. Kobo Disagrees. Blame Adobe"}, {"id": 785560528, "item_id": 49097533, "url": "https://news.ycombinator.com/item?id=49097533", "by": "brokegrammer", "date": "2026-07-29", "stance": "recommend", "quote": "I use Calibre to send books over wifi.", "excerpt": "I installed it and I use Calibre to send books over wifi. Simple and sweet setup.", "context": "", "use_case": "sending books to e-reader", "switched_from": "", "story": "KOReader"}]}, {"label": "Library management", "summary": "Recommended for organizing an existing ebook collection.", "quotes": [{"id": 780966752, "item_id": 48810422, "url": "https://news.ycombinator.com/item?id=48810422", "by": "asveikau", "date": "2026-07-06", "stance": "recommend", "quote": "I would recommend looking into calibre for managing such titles.", "excerpt": "Came here to complain about this workflow too. If you don't want to resort to piracy, there are many vendors that sell epubs with weak DRM and presumably give money to publishers. Ebooks.com is one. If you have not already, I would recommend looking into calibre for managing such titles. (I did this even when I used to buy from Kindle, first thing I would do is break the DRM and put it into calibre even if I was only", "context": "", "use_case": "managing ebooks", "switched_from": "", "story": "What does Jeff Bezos think is going to happen?"}, {"id": 792194480, "item_id": 49512155, "url": "https://news.ycombinator.com/item?id=49512155", "by": "Night_Thastus", "date": "2026-08-31", "stance": "neutral", "quote": "you can also load them manually through something like Calibre if you already have a collection of ebooks", "excerpt": "I got the Libra Color awhile back. I rediscovered my love of reading. Chewed through dozens of Star Trek books (some are quite good!). And a comic, which surprised me with the color and resolution the Libra offered. The store seems to work well and the prices are pretty cheap, but you can also load them manually through something like Calibre if you already have a collection of ebooks. I love how thin and light it is", "context": "", "use_case": "loading ebooks onto e-reader", "switched_from": "", "story": "Rakuten Kobo returns to U.S. retail as sales double"}, {"id": 785986848, "item_id": 49124178, "url": "https://news.ycombinator.com/item?id=49124178", "by": "al_borland", "date": "2026-07-31", "stance": "neutral", "quote": "I have ebooks in Calibre, which I use to sync them over to the Kobo.", "excerpt": "I have a Kobo which has worked well enough for me. I have ebooks in Calibre, which I use to sync them over to the Kobo. I think I have the Clara. There are a couple ways the Kobo will render an ebook. If not in a Kobo format, it is pretty ugly, so converting them is worth it. I read thousands of pages before realizing this.", "context": "", "use_case": "ebook library and syncing", "switched_from": "", "story": "Ask HN: What E-Reader to Buy?"}]}, {"label": "Format conversion", "summary": "Described as a very good open source conversion tool, and converting books improves rendering on Kobo.", "quotes": [{"id": 780961536, "item_id": 48810096, "url": "https://news.ycombinator.com/item?id=48810096", "by": "lpapez", "date": "2026-07-06", "stance": "recommend", "quote": "There is a very good open source conversion tool called \"Calibre\". I use it all the time", "excerpt": "There is a very good open source conversion tool called \"Calibre\". I use it all the time to convert my, erm, security backups of books I own.", "context": "", "use_case": "converting ebooks", "switched_from": "", "story": "What does Jeff Bezos think is going to happen?"}, {"id": 785986848, "item_id": 49124178, "url": "https://news.ycombinator.com/item?id=49124178", "by": "al_borland", "date": "2026-07-31", "stance": "neutral", "quote": "I have ebooks in Calibre, which I use to sync them over to the Kobo.", "excerpt": "I have a Kobo which has worked well enough for me. I have ebooks in Calibre, which I use to sync them over to the Kobo. I think I have the Clara. There are a couple ways the Kobo will render an ebook. If not in a Kobo format, it is pretty ugly, so converting them is worth it. I read thousands of pages before realizing this.", "context": "", "use_case": "ebook library and syncing", "switched_from": "", "story": "Ask HN: What E-Reader to Buy?"}]}], "caveats": [{"label": "Clunky UI", "summary": "One commenter finds it functional but calls its interface godawful and prefers managing epubs in a file browser.", "quotes": [{"id": 792182768, "item_id": 49511423, "url": "https://news.ycombinator.com/item?id=49511423", "by": "cosmic_cheese", "date": "2026-08-31", "stance": "warn", "quote": "Calibre may be functional, but its UI is godawful", "excerpt": "They\u2019re also just more user friendly in general. I have a nearly decade old Kobo that still serves its purpose well and I love how it shows up as a mass storage device when plugged into my computer. No clunky management software (Calibre may be functional, but its UI is godawful) or file conversions required, you just manage plain old epubs in your file browser. That functionality can\u2019t randomly vanish one day, eithe", "context": "", "use_case": "ebook management", "switched_from": "", "story": "Rakuten Kobo returns to U.S. retail as sales double"}]}], "who": [], "tags": ["for Kobo owners", "for e-reader owners", "open source"], "use_cases": ["ebook management", "loading ebooks onto e-reader", "ebook library and syncing", "sending books to e-reader", "managing ebooks", "converting ebooks"], "compared": [], "makers": [], "threads": [{"url": "https://news.ycombinator.com/item?id=49510532", "title": "Rakuten Kobo returns to U.S. retail as sales double", "mentions": 2}, {"url": "https://news.ycombinator.com/item?id=48809208", "title": "What does Jeff Bezos think is going to happen?", "mentions": 2}, {"url": "https://news.ycombinator.com/item?id=49596629", "title": "Tiny $70 Xteink X3 e-reader", "mentions": 1}, {"url": "https://news.ycombinator.com/item?id=49123088", "title": "Ask HN: What E-Reader to Buy?", "mentions": 1}, {"url": "https://news.ycombinator.com/item?id=49095865", "title": "KOReader", "mentions": 1}, {"url": "https://news.ycombinator.com/item?id=48643848", "title": "Ask HN: New clean macOS install. Must-have apps? Best browser?", "mentions": 1}], "sentiment_by_month": {"2025-11": {}, "2025-12": {}, "2026-01": {}, "2026-02": {}, "2026-03": {}, "2026-04": {}, "2026-05": {}, "2026-06": {"recommend": 2}, "2026-07": {"recommend": 3, "neutral": 1}, "2026-08": {"warn": 1, "neutral": 1}, "2026-09": {"recommend": 1}, "2026-10": {}}, "quotes": [{"id": 793606225, "item_id": 49600389, "url": "https://news.ycombinator.com/item?id=49600389", "by": "beej71", "date": "2026-09-07", "stance": "recommend", "quote": "Crosspoint integration with Calibre.", "excerpt": "I have an X4. I've read about 15 books on it so far, and I carry it everywhere. I used to read books on my phone (Moon Reader), but it wasn't as compelling. I think it was a combination of the screen and the fact that I'm used to using the phone for other things. But I can't really pin it down more than that. Things I like: Flashable firmware. If they disable this capability, I wouldn't buy it. I'm using Crosspoint R", "context": "", "use_case": "ebook management", "switched_from": "", "story": "Tiny $70 Xteink X3 e-reader"}, {"id": 792194480, "item_id": 49512155, "url": "https://news.ycombinator.com/item?id=49512155", "by": "Night_Thastus", "date": "2026-08-31", "stance": "neutral", "quote": "you can also load them manually through something like Calibre if you already have a collection of ebooks", "excerpt": "I got the Libra Color awhile back. I rediscovered my love of reading. Chewed through dozens of Star Trek books (some are quite good!). And a comic, which surprised me with the color and resolution the Libra offered. The store seems to work well and the prices are pretty cheap, but you can also load them manually through something like Calibre if you already have a collection of ebooks. I love how thin and light it is", "context": "", "use_case": "loading ebooks onto e-reader", "switched_from": "", "story": "Rakuten Kobo returns to U.S. retail as sales double"}, {"id": 792182768, "item_id": 49511423, "url": "https://news.ycombinator.com/item?id=49511423", "by": "cosmic_cheese", "date": "2026-08-31", "stance": "warn", "quote": "Calibre may be functional, but its UI is godawful", "excerpt": "They\u2019re also just more user friendly in general. I have a nearly decade old Kobo that still serves its purpose well and I love how it shows up as a mass storage device when plugged into my computer. No clunky management software (Calibre may be functional, but its UI is godawful) or file conversions required, you just manage plain old epubs in your file browser. That functionality can\u2019t randomly vanish one day, eithe", "context": "", "use_case": "ebook management", "switched_from": "", "story": "Rakuten Kobo returns to U.S. retail as sales double"}, {"id": 785986848, "item_id": 49124178, "url": "https://news.ycombinator.com/item?id=49124178", "by": "al_borland", "date": "2026-07-31", "stance": "neutral", "quote": "I have ebooks in Calibre, which I use to sync them over to the Kobo.", "excerpt": "I have a Kobo which has worked well enough for me. I have ebooks in Calibre, which I use to sync them over to the Kobo. I think I have the Clara. There are a couple ways the Kobo will render an ebook. If not in a Kobo format, it is pretty ugly, so converting them is worth it. I read thousands of pages before realizing this.", "context": "", "use_case": "ebook library and syncing", "switched_from": "", "story": "Ask HN: What E-Reader to Buy?"}, {"id": 785560528, "item_id": 49097533, "url": "https://news.ycombinator.com/item?id=49097533", "by": "brokegrammer", "date": "2026-07-29", "stance": "recommend", "quote": "I use Calibre to send books over wifi.", "excerpt": "I installed it and I use Calibre to send books over wifi. Simple and sweet setup.", "context": "", "use_case": "sending books to e-reader", "switched_from": "", "story": "KOReader"}, {"id": 780966752, "item_id": 48810422, "url": "https://news.ycombinator.com/item?id=48810422", "by": "asveikau", "date": "2026-07-06", "stance": "recommend", "quote": "I would recommend looking into calibre for managing such titles.", "excerpt": "Came here to complain about this workflow too. If you don't want to resort to piracy, there are many vendors that sell epubs with weak DRM and presumably give money to publishers. Ebooks.com is one. If you have not already, I would recommend looking into calibre for managing such titles. (I did this even when I used to buy from Kindle, first thing I would do is break the DRM and put it into calibre even if I was only", "context": "", "use_case": "managing ebooks", "switched_from": "", "story": "What does Jeff Bezos think is going to happen?"}, {"id": 780961536, "item_id": 48810096, "url": "https://news.ycombinator.com/item?id=48810096", "by": "lpapez", "date": "2026-07-06", "stance": "recommend", "quote": "There is a very good open source conversion tool called \"Calibre\". I use it all the time", "excerpt": "There is a very good open source conversion tool called \"Calibre\". I use it all the time to convert my, erm, security backups of books I own.", "context": "", "use_case": "converting ebooks", "switched_from": "", "story": "What does Jeff Bezos think is going to happen?"}, {"id": 778345635, "item_id": 48646602, "url": "https://news.ycombinator.com/item?id=48646602", "by": "k310", "date": "2026-06-23", "stance": "recommend", "quote": "Ones I actually use.", "excerpt": "Ublock-origin with Firefox, Audacity, Batch Photo Resizer, calibre, cardflow, Diffraction, Ejimo and Ultra Character Map (try finding emojis without them), Libre Office, Paprika Recipe Manager, Samurai Safe, SeaMonkey (who else edits HTML?) GIMP, Darktable, RawTherapee, Super Photo Upscaler, Sublime Text, VLC, Clearview (and why isn't epub supported natively?), PhotoSync (share photos with all platforms), GhostText f", "context": "", "use_case": "ebooks", "switched_from": "", "story": "Ask HN: New clean macOS install. Must-have apps? Best browser?"}, {"id": 776615360, "item_id": 48538460, "url": "https://news.ycombinator.com/item?id=48538460", "by": "ornornor", "date": "2026-06-15", "stance": "recommend", "quote": "use calibre with the kobo plugin", "excerpt": "I don\u2019t miss my kindle, at all. Its text layout engine was a joke (every page edge was ragged!), you depend very heavily on amazons goodwill to keep allowing you, the device owner, to sideload your own books, it\u2019s getting harder to install third party software, and well that one is personal but it\u2019s from Amazon. I\u2019ve switched to kobos (Clara HD) and I\u2019ve had to for years. It\u2019s chugging along (had to 3d print a replac", "context": "", "use_case": "ebook management with Kobo", "switched_from": "", "story": "Your ePub Is Fine. Kobo Disagrees. Blame Adobe"}]}