E-readers and devices
Your e-readers, served from the browser.
Plug it in, open its folder, or let it download from its own catalog. Each device remembers the version profile it receives. Copying never deletes a book.
E-readers and devices
Six ways to reach your devices
| Method | What travels | You need | Limit |
|---|---|---|---|
SD card and USB e-reader | Open the folder of an SD card or a plugged-in e-reader from your computer: see what’s on it, import files the cloud doesn’t have yet, or copy a ready version onto it. | A browser that supports File System Access, an HTTPS connection, the card or e-reader mounted on your computer, and your explicit read or write permission. | Inventory and copying need an open tab and permissions that are still valid. Folder access is granted to this browser only and doesn’t carry over to another device. |
Crosspoint on your local network | From your browser, connect to a Crosspoint e-reader on the same network: see what’s on it, send it EPUBs and, once you confirm, remove recognized files. | Compatible firmware, the Calibre Wireless screen open on the e-reader, the same local network, and a browser allowed to reach the e-reader on ports 80 (HTTP) and 81 (WebSocket). | The tab and the connection screen must stay open during the exchange. To bring files from the e-reader back to the cloud, use USB or the SD card: the local network connection can’t do that. |
Wireless Calibre from the server | Here the e-reader connects to the Calibre TCP server itself: it receives prepared books, reports the files it holds and carries out the removals you request. | A compatible wireless Calibre client, a reachable server address and port, a personal secret for the device, and a connection you explicitly open for a ten-minute window. | The Calibre TCP protocol encrypts nothing: titles, inventory and book contents can be intercepted on the network. On a shared network, use OPDS over HTTPS instead. This mode is separate from local-network Crosspoint mode. |
HTTPS OPDS catalog | Browse your library from a compatible reading app (recent books, authors, series, search, outbox, books shared with you) and download whatever you want to read. | A compatible OPDS client, an Internet connection, and the catalog address with the login and secret created for your device. | CrossPoint e-readers and generic OPDS clients only receive EPUBs. A download doesn’t prove the book is still on the device, and OPDS never sends files from the device back to the cloud. |
KOReader / kosync progress | Exchange your reading position with KOReader or another compatible client, and see the latest recognized progress, with its device and date, on the book’s page. | A client that accepts a custom kosync server, the mode switched on, and the device login with its secret. No account needs to be created from the e-reader. | This mode doesn’t transfer books, and the position may not land in exactly the same spot as in the Web reader. When it’s unclear which book a position belongs to, the progress is kept rather than attached to a book at random. |
Mobile API and Library Manager Reader | An authorized app can sync the catalog, download and import files, confirm its local copies and exchange progress. Library Manager Reader, the official open-source Android client, uses it to download your books and sync your reading position both ways in KOReader format. | An app that integrates the public API, OAuth authorization with PKCE and account consent, scopes matched to each action, and a local check of every copy before it is read. | This cloud release contains no mobile binary: Library Manager Reader is published separately, as an APK for Android, and isn’t distributed on iOS yet. An app confirming a copy doesn’t prove the file is physically stored, and a progress conflict requires an explicit choice. |
One send profile per device.
Original file, Normalized, Lossless, Balanced, Small Xteink reader or Text only: the device keeps your choice. A Kindle folder only receives AZW3, a Crosspoint only EPUB. If the version is missing, it’s prepared before the copy, with a progress bar and a button to stop. A book that can’t go out is listed with the reason, never silently replaced.
SD card and USB e-reader, from the browser.
The browser asks for folder access (File System Access, HTTPS). Read only to inventory and import, read and write to copy. The inventory can hold 10,000 files; on return, unchanged files aren’t read again. Removing a recognized file asks for confirmation and checks its bytes. The tab must stay open during the operation.
Crosspoint on your Wi-Fi network.
Xteink X3, X4 and X4 Pro: Calibre Wireless screen open on the e-reader, same network, and the browser finds it at crosspoint.local or at its IP address. EPUB inventory, sending, confirmed removals. No Calibre, no plugin. Bringing files back from the e-reader goes through USB or the SD card.
Online e-readers: wireless Calibre, OPDS, kosync.
Add an online e-reader: it gets an lm-… login and a secret, shown once. Wireless Calibre: you arm the connection for ten minutes, the e-reader connects, books go out right away. OPDS: the e-reader browses your catalog (outbox, recent, authors, series, collections, shared books) over HTTPS. kosync: KOReader sends your progress back, visible on the book’s page. Known clients: KOReader on Kobo, Kindle, PocketBook or Android; CrossPoint; Moon+ Reader, KyBook, Thorium, Readest for OPDS.
FAQ
E-readers
Do I need to install Calibre?
No, the library runs in your browser. For a USB e-reader or an SD card, open its folder in a compatible browser and grant the permissions it asks for.
How do I reach my e-reader?
Plug in the USB e-reader or SD card, then open its folder in a compatible browser over a secure connection. Its contents appear, and you can copy your selection in either direction.
Do I need to keep the browser open?
For USB/SD and Crosspoint on your local network, yes: the tab has to stay open with the right permissions. Processing the server has already accepted keeps going even if you leave the page.
Do all methods sync the same information?
No. Transfers copy files, OPDS offers a catalog to download from, and KOReader/kosync only syncs personal progress. Whether you can see or remove files on the device depends on the method and its firmware.
Does it work with a Kindle?
Yes, through the folder of the e-reader plugged in over USB: the send profile of a Kindle folder prepares AZW3. No sending through Amazon e-mail.