Best for: Multitaskers or visually impaired users.
While not a third-party plugin, it is disabled by default on many devices.
For those with large libraries, the built-in OPDS client is fine. But the Calibre Companion plugin is telepathy. It connects wirelessly to your Calibre library and syncs metadata—collections, series info, tags, and ratings—directly into KOReader’s file browser. Suddenly, your device knows that The Two Towers is book two of The Lord of the Rings. It automates the library science so you can focus on reading.
For new users, the sheer number of available plugins can be overwhelming. To navigate this ecosystem, it is helpful to categorize them by function.
1. Connectivity and Synchronization Perhaps the most popular category involves moving data seamlessly between devices. The KOSync plugin is a standout example. It allows users to synchronize their reading progress across multiple devices. If you read a PDF on your Kobo e-reader and later open the same file on your Android tablet using KOReader, KOSync will automatically prompt you to jump to the page where you left off. Similarly, plugins like Wallabag allow users to fetch articles from the web directly to their e-reader, facilitating a "read later" workflow without the distractions of a web browser.
2. Text Analysis and Statistics For the data-driven reader, KOReader offers plugins that track and analyze reading habits. The Statistics plugin is a must-have for this demographic. It tracks the time spent on each book, calculates reading speed (pages per hour), and provides a calendar view of reading history. This gamification of reading can be highly motivating for those trying to build a consistent habit.
3. Academic and Annotation Tools Students and researchers benefit significantly from tools designed to manage highlights and notes. While the base KOReader handles highlights well, plugins like EverNote or Joplin integration allow users to export their annotations directly to note-taking services. This bridges the gap between consumption (reading) and synthesis (writing), making e-ink devices viable tools for academic work.
4. Language Learning KOReader is exceptionally friendly to language learners. The Translate plugin leverages online engines like Google or DeepL to translate selected text instantly. More impressive is the dictionary support; users can install multiple dictionary databases. A reader learning Japanese, for instance, can install a Japanese-to-English dictionary and look up kanji instantly without leaving the page. The Vocab Builder plugin takes this a step further by saving looked-up words into a spaced repetition list, turning an e-reader into a flashcard tool.
5. Quality of Life Improvements Some plugins exist simply to make the device more pleasant to use. The AutoStandby plugin helps save battery life by putting the device to sleep after a set period of inactivity. The Terminal plugin provides a command-line interface for advanced users who want to debug or script their device. There is even a Weather plugin that displays a forecast, ensuring the e-reader remains a connected device without the full distraction of a smartphone.
KOReader includes a convenient plugin manager that allows you to download and update plugins directly from the official repository:
Arman found the old e-ink reader when cleaning out a box in his closet. It had scratches on the case and a stubborn sticker on the back, but the screen still held that calm, paper-like glow. He booted it up, opened KOReader, and felt something click: this was a device meant to be shaped by its user.
KOReader came with basics—reflowed PDFs, dictionaries, a few gestures—but Arman wanted more. He liked tinkering and valued small, well-designed tools. He discovered KOReader supported plugins: lightweight add-ons that could change behavior without rewriting the whole app.
He started with three simple goals:
First, the comics plugin. Arman installed a community plugin that added panel detection and smart zoom. Instead of pinching and panning for each panel, the reader automatically focused single panels in sequence. On long, lazy weekends he devoured graphic novels in twice the time and with half the effort. The plugin was tiny, easy to configure, and the author left clear, short documentation—exactly what Arman loved.
Next came the notes plugin. He used a spaced-repetition service on his laptop and wanted flashcards on the device for idle moments. The plugin synced encrypted exports over simple file-drop syncing (no cloud account required). When the reader slept, it still indexed new imported decks. During commutes, a quick swipe summoned a one-card review; a long press marked cards to study later. The integration was straightforward: KOReader’s plugin hooks for gestures and storage were all the plugin needed.
Finally, the night mode scheduler. The built-in theme supported custom colors, but Arman wanted a warm-tone schedule tied to sunset. A tiny plugin read system time and adjusted color profiles automatically, gently shifting the display hue as evening came. It even disabled animations to save a little battery when the light softened. The result: less eye strain, a more book-like feel at night, and better sleep after reading.
Along the way he learned the ecosystem’s norms:
Months later Arman contributed his own plugin: a tiny script that trimmed leading and trailing whitespace from imported text and normalized chapter titles. It was a small fix, but used by enough people that the community thanked him in a short thread. He felt like he’d given something back.
The reader never became something it wasn’t. KOReader remained a lean reading platform; plugins let users bend it toward their needs without turning it into a bloated app. Arman’s e-ink weekends became richer—not because of a single breakthrough feature, but because a few simple, well-crafted plugins fit into his life and workflow.
In the end, the lesson was straightforward: small, focused plugins empower long-lived devices to stay useful. They let readers keep their calm center while adapting to how people actually read.
KOReader has a powerful plugin system that allows you to extend its functionality, ranging from simple UI tweaks to integrating AI and external sync services
. While many are built-in, you can also find and install third-party plugins from community repositories like GitHub - koreader/contrib Popular Community Plugins Project Title
: A complete UI overhaul that changes the look and feel of the reader. HighlightSync
: Synchronizes and merges your highlights, notes, and bookmarks across multiple devices using cloud services like WebDAV or Dropbox. Obsidian Sync
: Directly pushes highlights and notes to your Obsidian vault over WiFi without using cables or third-party cloud services. ReadMastery koreader plugins
: Gamifies your reading experience with XP, levels, streaks, and achievements.
: A fast, standalone RSS reader for accessing web feeds directly on your device. KOAssistant / AI Plugins
: Integrates AI (like ChatGPT) to discuss text context or generate flashcard definitions for Anki. Filebrowser
: Allows you to access your e-reader's files via a web browser over WiFi for easier book transfers. How to Install Plugins
KOReader plugins offer the ultimate way to customize your e-reading experience, turning a powerful open-source document viewer into a personalized e-reading powerhouse. Whether you read on a Kindle, Kobo, Android device, or PocketBook, plugins expand the core reading software by adding new user interfaces, wireless file syncing, cloud management, and external content platforms. 🛠️ Essential Built-In Plugins
When you install KOReader, several highly powerful plugins come pre-installed. These can be enabled or configured directly from the Tools or Plugin Management menu within the app.
Cover Browser: Enhances the file explorer with a visual grid view of your book covers instead of a plain list.
Calibre Companion: Allows you to send documents directly from your desktop Calibre library over local Wi-Fi.
Wallabag: Integrates directly with the self-hosted Wallabag read-it-later service to download articles for offline reading.
Reading Statistics: Tracks and visualizes how fast you read, how long you spend on each page, and predicts when you will finish a book.
Auto Warmth and Night Mode: Schedules temperature shifts for your e-reader's frontlight based on local time or a fixed schedule.
QR Code Generator: Generates a QR code from any highlighted text to scan and quickly paste quotes into your phone. 🚀 Top Third-Party Plugins KOReader User Guide Best for: Multitaskers or visually impaired users
KOReader uses a modular architecture where most of its high-level features—like the Cover Browser, Dictionary, and Auto-warmth—are actually internal plugins. You can expand your device's capabilities by installing third-party plugins that add everything from Syncthing support to AI-generated summaries. 🚀 Must-Have Third-Party Plugins
While many features are built-in, these community-driven tools are widely recommended:
App Store Plugin: The easiest way to browse, install, and update other plugins directly from your e-reader.
Syncthing: Wirelessly sync your entire book library and reading progress across multiple devices.
Anki: Automatically export lookups and highlights from your books directly to Anki flashcards.
Hardcover: Track your reading status and post quotes directly to your Hardcover.app profile.
Project: Title: A major UI overhaul that replaces the standard file manager with a modern, commercial-looking cover gallery. 🛠️ How to Install Plugins
If you aren't using the App Store plugin, follow these manual steps: UPDATE: I made the Plugin! : r/koreader
Unlike typical app stores, KOReader plugins live inside the application’s file structure. To manage them:
If you are serious about reading on an E Ink device (Kindle, Kobo, PocketBook, or Android), you have likely heard of KOReader. Famous for its granular PDF cropping, multi-format support (from EPUB to CBZ to DJVU), and unparalleled customization, KOReader transforms a basic e-reader into a literary Swiss Army knife.
However, the true hidden gem of this open-source project is its plugin system. Plugins allow you to add features ranging from cloud synchronization to word games without bloating the core software.
Here is a curated breakdown of the must-have plugins for KOReader and how to use them. First, the comics plugin
Best for: Kindle users (who hate typing with a sluggish keyboard).
Connecting to a complex hotel Wi-Fi or transferring a book via Calibre often requires typing passwords. This plugin generates a QR code on your e-reader screen.