RubiMask - PDF Ruby Eraser
Japanese PDF to Text & Audio
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Turn Japanese books into clean text & audio. Auto-mask ruby characters for accurate OCR, export as TXT, PDF or M4A. Your all-in-one book digitizer.
【PDF to Text & Audio】All-in-One Japanese Book Digitizer!
Load vertical Japanese book PDFs/images → Auto-mask ruby (furigana) → OCR text extraction → Audio file export. Everything in ONE app!
PROBLEM SOLVED
"OCR scrambles my text because ruby mixes with main characters..."
"Scanned books have terrible text recognition accuracy..."
"I want to listen to my books as audio..."
RubiMask auto-detects and masks ruby text, enabling high-accuracy OCR. Plus, convert your text to audio files (M4A) for listening!
KEY FEATURES
【Auto Ruby Masking】
- Automatically detects text columns in vertical Japanese
- Calculates column spacing to mask only ruby areas
- Fully adjustable column width and pitch
【OCR Text Recognition】
- Specialized for vertical Japanese text
- Horizontal text also supported
- Edit recognized text directly in-app
- Real-time character change tracking
【Multiple Export Formats】
- Text file (.txt)
- Audio file (M4A) - Turn books into audiobooks!
- PNG images (ZIP compression available)
- Masked PDF output
- Save directly to Photos
【Convenience Features】
- Margin masking (remove page numbers, headers)
- Manual mask editing (drag & drop)
- Project save/load for pause & resume
- Pinch-to-zoom for precise adjustments
PERFECT FOR
- Digitizing paper books and rare editions
- Extracting text from novels and manga
- Preparing source text for translation
- Creating ruby-free versions for learners
- Converting books to audiobook format
- Creating accessible text for screen readers
PREMIUM FEATURES (one-time purchase)
- Remove all ads
- Unlimited pages (free: 100 pages)
- Unlimited project saves (free: 3 projects)
- PDF export
- Audio export (M4A)
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Minor bug fixes and performance improvements.
The developer, KeiK LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- KEIK, LIMITED LIABILITY COMPANY
- Size
- 25.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- RubiMask Premium $5.99
- Copyright
- © 2026 KEIK, LLC