Koodo Reader

What Koodo Reader is

Koodo Reader is a reading application with a built-in bookshelf. You import files from local folders, the app reads the cover art and metadata, and the library becomes a grid of titles you can search, tag into shelves and sort. The project supports more than fifteen ebook formats, among them EPUB, PDF, MOBI, AZW3, plain text and comic archives, which covers almost everything you are likely to own that is not locked behind a store's DRM. Around the page itself sit the reading tools: single-column, two-column and continuous scroll layouts, adjustable fonts and margins, background themes including dark options, text-to-speech through the system voices, an instant translation and dictionary lookup for selected text, and bookmarks, highlights and notes attached to the text. The app is published as open source under the AGPL v3.

Reading, annotating and moving between devices

A session usually starts in the bookshelf: pick a title, choose a layout, and read. Selecting a passage brings up the annotation tools, and every highlight or note lands in the notes panel for that book, where it can be reviewed later. Koodo's sync story is deliberately bring-your-own-storage. It can back up and sync your library, reading progress, bookmarks, shelves, highlights and notes through services such as OneDrive, Google Drive, Dropbox, MEGA, pCloud, WebDAV, FTP, SFTP, SMB, object storage or a self-hosted Docker endpoint. That is a real advantage over readers that only sync through a vendor account, but it also means you configure it, and you own the consequences if the remote folder is deleted. Because the app also exists for macOS, Linux, Android, iOS and the browser, one configuration can follow you across devices.

Practical limits

Koodo cannot open books protected by DRM, so store-purchased Kindle and Adobe-protected titles will fail to load; that is a licensing limitation, not a bug to work around. It is an Electron application, which makes the download and the memory footprint larger than a native reader, and PDF handling is aimed at comfortable reading rather than at editing pages, filling forms or producing print-ready output. There is no library conversion pipeline, no metadata catalogue lookup and no device management, so it does not replace a full ebook manager. Sync configuration can take a few attempts, particularly with WebDAV or SMB shares, and conflicts are resolved by the storage provider rather than by merge logic in the app.

Who should choose something else

If your priority is reorganising and converting a large collection, use a library manager and keep Koodo for reading. If you need heavy PDF annotation, a dedicated annotation tool will be more precise. If you only read Kindle purchases, the vendor's own app is the only thing that will open them without removing protection. Koodo Reader is the right pick when you want one attractive, free reader across several operating systems with your annotations in storage you control.