RubiMask - OCR PDF Scanner
Image to Text, Audio & Books
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Big OCR accuracy boost! Auto perspective correction for angled photos, 90° rotation, new export options. Mask furigana on Japanese books and export as TXT, PDF, or audio.
【PDF & Photo to Text, Audio, Translation】OCR, translate, and read aloud — all in ONE app!
Load scanned books, PDFs, or photos → OCR text extraction → translate → listen with text-to-speech or export audio files. Everything in one app.
For vertical Japanese books, RubiMask auto-masks ruby (furigana) before OCR, so small phonetic characters never scramble your text — a unique feature for Japanese book digitization.
PROBLEM SOLVED
"OCR scrambles my Japanese text because furigana mixes with main characters..."
"Scanned books have terrible text recognition accuracy..."
"I want to listen to my books as audio..."
"I need to translate a printed document I photographed..."
KEY FEATURES
【Multilingual OCR】
- Specialized recognition for vertical Japanese text
- Supports English, Chinese, Korean, French, German, Spanish, and many more
- Choose the recognition language per document
- Edit recognized text directly in-app
- Real-time character change tracking
- Automatically removes running headers and page numbers, recognizing body text only
【Auto Ruby Masking】(unique for vertical Japanese)
- Automatically detects text columns in vertical Japanese
- Calculates column spacing to mask only ruby areas
- Robust on gray-paper scans and irregular layouts
- Fully adjustable column width and pitch, tap-to-edit masks
【Enhanced Photo Import】
- Auto perspective correction for documents photographed at an angle
- Rotate photos 90° left or right
- Recognizes high-resolution photos (12MP+) at full quality
【Translation】
- Translate recognized text with one tap (iOS 17.4+)
- Great for language learning and reading foreign documents
【Text to Speech】
- Listen to recognized text with natural voices
- Export audio files (M4A) — turn books into audiobooks!
- Adjustable speed and voice
【Multiple Export Formats】
- Text file (.txt)
- Audio file (M4A)
- PNG images (ZIP compression available)
- Masked PDF output
- Save directly to Photos
- Export options: insert page breaks or join lines into sentences
【Convenience Features】
- App interface available in 35 languages
- Sample PDFs in your language to try every feature
- Margin masking (remove page numbers, headers)
- Manual mask editing (drag & drop)
- Undo/redo for mask editing
- 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 documents
- Preparing source text for translation
- Creating furigana-free versions for Japanese learners
- Converting books to audiobook format
- Creating accessible text for screen readers
- Reading printed foreign-language documents
PREMIUM FEATURES
- Remove all ads
- Unlimited pages (free: 100 pages)
- Unlimited project saves (free: 3 projects)
- PDF export
- Audio export (M4A)
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://keik.co.jp/rubimask/privacy-en.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Minor improvements and bug fixes.
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
- 27.4 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 and 32 more
- English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- RubiMask Premium $11.99
- RubiMask Premium $2.99
- RubiMask Premium $19.99
- Copyright
- © 2026 KEIK, LLC