KOReader

Despite its minimalistic looks, KOReader is a very powerful and customizable application. This section is like a table of contents which is how-to oriented. So if you are a new user, this is the best place to start. Here you can read what KOReader can do and learn how to do it by following these  links to go to the mentioned sections. INFO Name of KOReader comes from the beginnings of the project: Kindle/Kobo Open Reader. Of course the reader grew so much over the years, now an accurate abbreviation would be something like KKPRCSALMOReader (Kindle Kobo Pocketbook Remarkable Cervantes Sony Android Linux MacOS Open reader) but this is not that nice to pronounce, so we choose to keep it simple :)

Transfer your reading materials in different ways

• USB mass storage mode for supporting devices.
• Cloud storage (Dropbox/FTP/Webdav) with suitable accounts.
• KOReader can act as an SSH server, so you can use an SFTP application or your file manager to directly transfer files.
• With the Calibre plugin you can send books from your Calibre Library directly to your KOReader devices over wifi.
• With the News downloader plugin you can download RSS and Atom news entries to your device as HTML files.
• With the Wallabag plugin you can retrieve articles from your Wallabag account (a server based read-it-later service like Pocket).

Adjust the appearance of text as you wish

• Change fonts (including your own), font size, contrast, boldness, kerning, word spacing, word expansion, text alignment, line spacing, column layout, margins…
• Use the included powerful style tweaks or write your own ones to change how your books are rendered precisely.
• Invert screen colors for night mode manually or automatically.
• Adjust your frontlight color warmth automatically.

Take notes and make highlights while reading

• Highlight text with different styles and colors, place bookmarks.
• Two-tap mode for academic/longer highlights.
• Add notes using a customizable keyboard including diacritic modifiers.
• Take screenshots.
• Track your reading statistics including reading progress, time range and calendar views.

Export your notes and highlights flexibly

• Export your notes and highlights to your device as text, markdown, HTML, JSON or Kindle clippings format.
• Synchronize to online services like Joplin, Readwise, Memos, Flomo and XMNote.

Arrange and browse your library easily

• Powerful File Browser where you can copy, move, rename, create, delete files and folders and perform bulk operations.
• See your library as you like with many detailed and mosaic views.
• Add your books to your Favorites for quick access or create your own Collections with sorting and filtering.

Fly through your book with powerful tools

• Skim widget to quickly jump between pages, chapters, bookmarks.
• Unique Book map to see a bird’s eye map of your book including all your notes and highlights.
• Page browser to move through pages like a film reel.
• Bookmarks browser to browse your highlights and notes easily.
• Create an alternative table of contents automatically or manually if you don’t like the one that comes with your book.
• Hide and exclude certain parts of your book like Appendix, Index, References etc. for more accurate page counts.

Control KOReader like a virtuoso

• Powerful gesture system with 200+ actions allows you to control every aspect of KOReader with a tap or swipe.
• If you have a keyboard (internal, wired or bluetooth) you can also assign keyboard shortcuts to these actions.
• Or create your own menus with your favorite actions with Quick Menu and access them with a tap or swipe.
• Create Profiles to control every aspect of KOReader and automate actions.

Search, Lookup and Translation tools

• Search the document by selecting or entering text (including regular expressions)
• Search in your bookmarks, highlights and notes
• Lookup text in Wikipedia or in installed dictionaries and translate it by a long-tap
• Translate whole page at once between more than 130 languages
• With our poweful plugin system, you can even discuss the text with ChatGPT (after installing the plugin).

KOReader can control your device

• KOReader can update itself 
• Dim or turn off your screen light after a set interval
• Set your page refresh intervals for different reading conditions.
• Set your own screensaver from many options like random images, book cover, reading, progress etc.
• Set battery charge limit alarms to prevent deep discharge/over charge.
• Set a memory usage alert (useful for devices for smaller memory) and optionally restart KOReader upon reaching this limit.

PDF documents are easier to read on e-ink with KOReader

• Crop margins automatically or manually
• Reflow documents to extract text and read easier on a small screen
• Apply OCR to documents without text layers, like scanned old books.
• Different zoom types and page flow directions to read multi-column documents like scientific articles easily.
• Auto straighten tilted documents, like scanned old books.
• Save your highlights directly into PDFs which allows you to see them without KOReader.
• Special Panel zoom feature for reading mangas.
• Adjustable screen refresh settings for perfectly balancing between ghosting and speed.

Advanced features for power users

• Add your own CSS style tweaks for books.
• User patches system which allows you to change the core behaviors of KOReader.
• Create a QR code from your clipboard to share text and links to other devices
• View HTML source of an EPUB document
• Create and edit text files on your device
• Open a terminal emulator and run commands on your device
• See your CPU, memory and battery usage stats