Chat with your books. Convert PDFs to reflowable ebooks. Unlock Focus Mode, Bionic Reading, and AI that actually understands what you're reading.
Traditional ebook readers haven't evolved. You highlight, you forget. PDFs are unreadable on phones. Your books can't answer questions. Sound familiar?
You read, highlight, and forget. No quizzes, no conversation, no retention.
PDFs weren't made for phones. Constant zooming, tiny text, no reflow.
Your reader can't explain concepts, answer questions, or help you learn.
EPUBs here, PDFs there. Your reading life scattered across apps.
AI intelligence, smart reading modes, and seamless PDF conversion—all in one powerful platform.
Ask questions about what you're reading and get instant, context-aware answers. Our AI understands exactly which paragraph you're on.
Our AI-powered conversion turns static PDFs into reflowable EPUBs. Read comfortably on any device with all features unlocked.
Highlights, notes, and bookmarks with categories. Export to Notion, Obsidian, or Markdown.
Track sessions, progress, and habits. Set goals and build consistent reading streaks.
Look up words, save to flashcards, and expand your vocabulary as you read.
AI-powered organization with auto-tagging, smart collections, and cross-book search.
High-quality narration for any book. Listen while commuting or doing chores.
Your library, progress, and annotations sync seamlessly across all devices.
Our proprietary TACS engine (Text Analysis and Content Structure) brings intelligence to PDF reading. We don't just display text—we understand it.
Accurate paragraph detection for perfect reading modes
95%+ AccuracyIdentifies titles, chapters, and section headings
90%+ AccuracyDetects bullet points, numbered lists, and sequences
92%+ AccuracyRecognizes footnotes and reference markers
88%+ AccuracyIdentifies figure and table captions
90%+ AccuracyExtracts table of contents automatically
93%+ AccuracyDetects citations and bibliography entries
85%+ AccuracyRecognizes block quotes and indented text
87%+ AccuracyThree powerful reading modes powered by our TACS engine. Each one designed to help you read more effectively.
Highlights one paragraph at a time, dimming everything else. Perfect for distraction-free deep reading.
Bolds the first portion of each word, guiding your eyes for faster reading with better comprehension.
Rapid Serial Visual Presentation shows one word at a time. Train yourself to read faster.
Export your highlights and notes to the tools you already use.
Start free, upgrade when you need more. No hidden fees, cancel anytime.
Perfect for casual readers getting started.
For serious readers who want the full experience.
For book clubs, study groups, and teams.
See what our beta users are saying about Chaptera.
"The AI chat feature changed how I read non-fiction. Instead of passively highlighting, I now have conversations with my books."
"Finally, I can read my technical PDF manuals on my phone without going crazy. The conversion quality is incredible."
"Focus Mode has been a game-changer for my ADHD. I can actually finish books now instead of getting distracted every paragraph."
Chaptera supports EPUB and PDF files. You can also convert PDFs to EPUBs using our AI-powered conversion tool for a better mobile reading experience.
Our AI understands the context of what you're reading using our TACS engine. When you ask a question, it knows exactly which paragraph you're on and can provide relevant answers, explanations, or summaries based on the book's content.
Absolutely. Your books and reading data are encrypted and never shared with third parties. We don't sell your data or use it for advertising. Your library is yours alone.
Yes! You can import EPUB and PDF files from your device or cloud storage (Google Drive, Dropbox). We'll automatically extract metadata and organize your library. DRM-protected files require removal of DRM first.
Chaptera works on any device with a modern web browser—Windows, Mac, Linux, iOS, Android, and tablets. Your library and reading progress sync automatically across all your devices.
Our AI-powered conversion achieves 95%+ accuracy for structure preservation (paragraphs, headers, chapters). Complex layouts like multi-column academic papers may require some manual adjustment.
Join thousands of readers transforming how they learn from books. Early access members get 50% off Pro for life.