Give your eyes a rest without pausing your story. Learn how to listen to any EPUB or PDF with synchronized sentence highlighting using GemReader's on-device neural text-to-speech engine.
Why Listen with Synchronized Read Aloud?
Whether you are commuting on a crowded train, preparing dinner, or easing eye strain after a long day in front of screens, listening to your books lets you keep learning without interruption. Traditional text-to-speech tools often sound robotic and mechanical, or stream your personal reading data to remote cloud servers.
GemReader provides an entirely offline text-to-speech engine. Voices are synthesized directly on your phone using local models with zero latency and zero data transfer. As words are spoken, a soft highlight flows seamlessly across the page, making it effortless to follow along or transition back to visual reading at any moment.
What You'll Need
To listen to your books, ensure you have:
• **Platforms**: GemReader installed on your device (Android or iOS). • **Prerequisites**: Any reflowable EPUB book or text-layered PDF open in the reader. • **Connection**: 100% offline (speech synthesis runs entirely on your phone's processor).
Step-by-Step Instructions
1. Open any book in GemReader and tap the center of the screen to reveal the reading toolbars. 2. Tap the three-dot menu (**⋮**) in the top right corner and tap **Read Aloud** (or tap the headphones icon in the toolbar). 3. A floating playback bar appears at the bottom of the screen. Tap **Play** to begin narration. 4. As the book is spoken aloud, notice the subtle highlight following along sentence by sentence. 5. Tap the voice settings button to choose between built-in native device speech and high-quality on-device AI voice reading. 6. Tap **Pause** on the playback bar or turn off your screen—narration continues smoothly even when your phone is locked.
Helpful Tips & Common Questions (Librarian's Advice)
• **Private On-Device Narration**: Because speech synthesis runs strictly on-device, not a single syllable of your books or personal documents is ever recorded or uploaded to external servers. • **Highlighting While Listening**: You can pause playback at any moment to highlight a memorable sentence or attach a note without losing your audio position. • **Native and AI Engines**: GemReader supports both native system text-to-speech voices that require no extra storage and downloadable on-device AI voice packs for smoother cadence.
Try it yourself