Booker E-Book Viewer

The Booker E-Book Viewer (widely utilized on e-ink devices like Onyx Boox and via the standalone Bookerei app) is packed with deep-level power features that many users overlook. Beyond basic page-flipping, these 10 hidden features will help you maximize your active reading, study sessions, and library organization. 1. Multi-Format Split View

You can divide your screen to look at two things at once. Tap the center of the display to access the main menu, select Split View, and choose to open a blank text notepad or a handwritten note pane alongside your book. The viewer automatically syncs the note document to the exact title of the book you are currently reading. 2. Automatic Online Metadata Fetching

If you drop unorganized EPUB or PDF files into the application, you do not have to manually edit the titles or authors. The software contains a hidden automation tool that pulls comprehensive book details, publishers, and release dates straight from the web to correct your files instantly. 3. Local-First Unlimited Notebooks

Unlike major cloud-locked readers that limit how much text you can export or annotate, Booker saves everything to a local database. You can add thousands of notes, research strings, and highlighted fragments to a single text file without ever being forced to log into an external account or risk your privacy. 4. Custom Visual Shelves

Instead of using boring, text-based folders, you can build a highly customized, magazine-style layout. This hidden setting allows you to select custom images or graphical templates and map them directly as the background covers for individual book categories and genres. 5. Multi-Gesture Control Re-Mapping

By default, the screen uses standard corner taps for navigation. However, deep in the system settings, you can completely redefine swipe gestures. You can set a two-finger swipe up to change font contrast, a side-swipe to trigger text-to-speech, or a bottom drag to pull up custom dictionaries. 6. Aggressive Edge-Cropping for PDFs

Reading dense academic textbooks or double-column research articles can ruin your text layout. The Crop Margins feature eliminates the dead white borders surrounding a page. This dynamically zooms and reflows text to occupy 100% of your viewable screen space. 7. Custom Background Textures

If pure stark white or basic pitch-black dark modes strain your eyes, you can swap to built-in ambient skins. Hidden under the theme settings are specialized vintage paper and aged parchment filters that mimic the precise light reflectance of natural physical books. 8. Text-to-Speech (TTS) Speed Pacing

When your eyes grow tired, you can tap the speaker icon to activate the audio engine. The hidden trick here is using it as a visual speed pacer. By turning the speed up to 1.5x or 2x while keeping your eyes on the physical screen, the audio forces your eyes to move rapidly, eliminating back-skipping and boosting reading speed. 9. Custom Cover Overrides

You do not have to settle for the ugly or low-resolution cover that came embedded with an old ebook file. By long-pressing a book title in the dashboard, you can open the cover manager to upload any high-definition JPG or PNG from your local storage to use as the permanent library thumbnail. 10. Annotation Filtering and Cloud Synthesis

If you have marked up a textbook with hundreds of underlines, finding a specific note can be tedious. The built-in Annotation Filter allows you to sort your personal additions by color, type (handwritten vs. typed text), or date created. You can then export just the filtered list directly to your computer or local text file. To tailor these tips to your specific device, let me know: