Reader

Rodel Reader provides three specialized readers, optimizing the reading experience for different content types.

Reader Types

Reader	Supported Formats	Key Features
Book Reader	EPUB, Mobi, FB2, TXT	Pagination/Scroll, annotations, TTS, AI assistant
PDF Reader	PDF	Multiple annotation tools, signature, zoom modes
Web Novel Reader	Legado online books	Virtual scrolling, dynamic chapter loading

The appropriate reader is automatically selected based on the book format when opening.

Book Reader

The book reader is based on the foliate-js engine, supporting mainstream e-book formats like EPUB, Mobi, and FB2.

Interface Layout

Area	Function
Reading Area	Book content display, supports pagination or scrolling
Top Bar	Book title, back button, settings entry
Bottom Bar	Reading progress, chapter info, page controls
Sidebar	TOC, search, annotations, bookmarks (expandable)

Page Turning

Method	Operation
Click	Click left/right side of the page
Swipe	Swipe left/right (touch devices)
Keyboard	Arrow keys ← →
Scroll Wheel	Mouse wheel (in pagination mode)

Tip

You can enable page turn animation in settings and choose whether to enable click to turn page.

Layout Modes

The book reader supports three layout modes:

Mode	Description	Use Cases
Pagination	Horizontal column reading, left/right page turns	Novels, prose (default)
Scroll	Vertical scrolling within chapters, auto-load next chapter at bottom	Technical docs, long articles
Document	Preserves original layout	Fixed-layout EPUBs

In pagination mode, you can configure:

Max Columns: Display 1 to 4 columns
Continuous Scroll: Auto-switch chapters when scrolling to edge

Reading Settings

Font Settings

Setting	Description
Font	Select from system fonts
Font Size	Adjust text size
Font Weight	100 (thin) to 900 (bold)
Letter Spacing	Spacing between characters
Override Font	Force custom font over embedded fonts

Typography Settings

Setting	Description
Line Height	Spacing between lines
Paragraph Spacing	Spacing between paragraphs
First Line Indent	Paragraph first line indentation
Justify	Whether to justify text
Hyphenation	Enable automatic word breaking
Override Layout	Force apply typography settings

Page Settings

Setting	Description
Max Column Width	Limit text area width
Column Gap	Gap between columns in dual-column mode
Vertical Margin	Top and bottom padding
Horizontal Margin	Left and right padding

Reading Themes

Rodel Reader includes multiple reading themes and supports custom themes:

Follow System: Auto-switch dark/light
Preset Themes: White paper, parchment, eye-care green, night, etc.
Custom Themes: Freely configure background and text colors

Tip

With Adaptive Colors enabled, text with insufficient contrast will be automatically adjusted on dark backgrounds.

Click the TOC button in the top bar or use keyboard shortcuts to open the sidebar.

Shows complete chapter list
Click chapter title to jump quickly
Current chapter is auto-highlighted

Full-text Search

Feature	Description
Basic Search	Enter keywords to search
Case Sensitive	Match case exactly
Whole Word	Match complete words only
Regex	Use regular expression syntax

Search results are grouped by chapter; click a result to jump to that location.

Annotation List

The sidebar shows all annotations for the current book in two tabs:

Highlights: All highlight marks
Notes: Annotations with note content

Click an annotation to jump to its location; right-click to edit or delete.

Bookmark List

Shows all bookmarks for the current book; click to jump quickly.

Bookmarks

Add Bookmark: Click the bookmark button in bottom bar
Remove Bookmark: Click the bookmark button again
Bookmark Indicator: Button is highlighted when current page has a bookmark

Progress Display

The bottom bar shows current reading progress:

Percentage Progress: Overall book progress
Chapter Info: Current chapter name
Progress Bar: Draggable for quick navigation

PDF Reader

The PDF reader is based on the PDF.js engine, optimized for PDF documents.

Interface Layout

Area	Function
Reading Area	PDF page rendering
Toolbar	Annotation tools, zoom controls
Sidebar	TOC, thumbnails, annotation list, bookmarks

View Modes

Mode	Description
Single Page	Display one page at a time
Dual Page	Display two pages side by side

Zoom Controls

Option	Description
Fit Width	Page width fits window
Fit Page	Entire page fits window
Custom	Enter specific zoom ratio

Annotation Features

The PDF reader provides rich annotation tools:

Text Markup

Tool	Description
Highlight	Yellow semi-transparent mark
Underline	Add line below text
Strikethrough	Add line through text

A quick menu appears after selecting text for fast text markup.

Shape Markup

Tool	Description
Rectangle	Draw rectangular frame
Circle	Draw circle or ellipse
Arrow	Draw arrow indicator

Freehand Tools

Tool	Description
Freehand Draw	Draw freely with pen
Freehand Highlight	Draw semi-transparent highlight

Thumbnails

Preview all pages as thumbnails; click to jump quickly.

Shows PDF bookmark/outline structure (if document contains one).

Annotation List

Shows all annotations grouped by page; click to navigate to annotation location.

Web Novel Reader

The web novel reader is designed for online book sources, supporting online books from Legado service.

Use Cases

Legado Online Books: Online books added from Legado data source
Web Novel Mode EPUB: EPUBs marked as web novel mode

Tip

When importing Legado books, select Online Import to use the web novel reader.

Features

Feature	Description
Virtual Scrolling	Chapters loaded on demand, saves memory
Continuous Reading	Auto-load next chapter when scrolling to chapter end
Chapter Cache	Loaded chapters remain in memory

Interface Elements

Area	Function
Reading Area	Chapter content, continuous scrolling
Top Bar	Book title, chapter title
Sidebar	TOC navigation
Settings Panel	Font, theme settings

Reading Settings

Web novel reader settings are similar to book reader:

Font, font size, font weight
Line height, paragraph spacing
Reading themes

Bookmark Feature

Web novel reader supports chapter-level bookmarks:

Click bookmark button to add/remove current chapter bookmark
View all bookmarks in sidebar

Paragraph Comments

Both book reader and web novel reader support viewing paragraph comments from the following sources:

Source	Use Case	Trigger
Fanqie Novel	EPUBs downloaded from Fanqie Novel	Automatically recognized
Qidian (起点中文网)	Local EPUBs scraped with Qidian metadata	Select Qidian when scraping

How to Use

Enable Comments: Click the comment button in the top bar (in book reader, also available in Settings → Display)
View Comments: Comment count bubbles appear at the end of paragraphs; click a bubble to open the comment panel
Browse Comments: The comment panel shows comment content, like count, and reply count; scroll to bottom to auto-load more

Qidian Comments

Qidian paragraph comments require scraping book metadata in the library first, selecting Qidian as the scraping source. The app automatically matches local chapter titles to the Qidian catalog; comments are only displayed for successfully matched chapters.

Common Features

The following features are available in both book reader and web novel reader.

Content Filtering

Content filtering allows you to add regex rules to filter chapter HTML content before rendering. This is especially useful for cleaning up noise from Legado book sources.

Use Cases

Scenario	Description
Escape Codes	Remove residual HTML escape characters from book sources
Embedded SVGs	Remove useless SVG graphics embedded in chapters
Ad Markers	Filter out ad text inserted by book sources

How to Use

Open the Display tab in the settings panel
Enter a regular expression in the Content Filter area
Click the add button — the rule takes effect immediately

Example: Remove SVG Content from Chapters

Some book sources embed useless SVG elements (decorative graphics, ad placeholders) in chapters. Use the following regex rule to remove them:

<svg[\s\S]*?<\/svg>

This rule matches everything from <svg to </svg> (including multi-line content) and removes it from the chapter.

Tip

Filter rules take effect immediately on the currently open book without needing to reopen it. Saved rules apply to all books.

Text-to-Speech (TTS)

Rodel Reader supports two TTS engines:

Engine	Features
Web Speech	Local engine, uses system voices
Edge TTS	Cloud engine, better quality, requires network

TTS Settings

Setting	Description
Voice	Select reading voice (by language)
Speed	Adjust reading speed
Volume	Adjust reading volume

How to Use

Click TTS button in toolbar
Select voice and parameters
Click play to start reading

The current sentence is highlighted during reading for easy following.

Text Selection Actions

A quick menu appears after selecting text:

Action	Description
Copy	Copy selected text
Highlight	Add highlight mark
Underline	Add underline
Note	Add note annotation
Translate	Translate selected content
Search	Search selected content with browser search engine