Transform flat, image-only scanned books into interactive text. Extract words, highlight quotes, search for keywords, and listen with Read Aloud entirely on-device.
Why On-Device OCR Breathes Life into Scanned Books
Historical monographs, archival library scans, and photocopied academic articles often exist only as flat pictures of pages. Because there is no underlying digital text layer, you cannot select sentences, look up definitions in offline dictionaries, or search for key concepts.
Optical character recognition (OCR) breathes digital life into these documents. GemReader processes scanned page images entirely on-device using local machine learning models. Without sending a single image to external cloud servers, your flat scans become fully selectable, searchable, and capable of being read aloud.
What You'll Need
To perform text recognition on scanned documents, ensure you have:
• **Platforms**: GemReader installed on Android (Android 10+) or iOS (iOS 17+). • **Document**: Any image-only or scanned PDF document open in the reader view. • **Connection**: 100% offline (character recognition executes strictly within your device's local neural hardware).
Step-by-Step Instructions
1. Open your scanned PDF document in GemReader. 2. Tap the center of the screen to summon the reading toolbars, then tap the **⋮** menu in the top right corner. 3. Tap **Tools** and select **Recognize Text (OCR)**. 4. In the recognition setup sheet, choose your processing scope: - **Current Page**: Quickly recognizes the active page in front of you. - **Page Range**: Processes a specific chapter or set of pages. - **Entire Document**: Performs full-document text recognition in the background. 5. Tap **Start Recognition**. A subtle progress bar will track the page analysis. 6. When finished, touch and drag your finger across any printed sentence on the page: blue selection handles will appear just like in a native reflowable ebook. 7. You can now highlight passages with the 6-color palette, add notes, copy citations, search for terms, or tap **Read Aloud** to listen to the scanned text.
Helpful Tips & Common Questions (Librarian's Advice)
• **Preserving the Original Artwork**: GemReader overlays the recognized text layer transparently over the original scan, so the authentic paper texture, typography, and historical layout remain completely preserved. • **100% On-Device Privacy**: Your confidential documents, legal briefs, and historical family papers are never uploaded to cloud servers; recognition happens exclusively on your phone's processor. • **GemReader Premium Feature**: On-device machine learning OCR for scanned PDFs is part of **GemReader Premium**. A single, one-time purchase unlocks advanced document tools permanently with zero subscriptions and zero ads.
Try it yourself