ThinkDocu helps you remember.Automatically save your place and continue from the exact page or video timestamp on any device. Upload ebooks (EPUB, MOBI), PDFs, and videos to your cloud library. Take timeline notes, highlight key moments, organize your digital library, and chat with an AI assistant to learn, review, and study faster. Perfect for students, researchers, and professionals.
Timeline Notes
Pin insights to exact moments.
AI Assistant
Chat with your documents and videos.
Coming soonQ2 Product Strategy Brief
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Research sessions become clearer when you can read, highlight, and annotate your notes in one place.
In a focused workspace, you can tag risks, pull out insights, and connect decisions to evidence in minutes.
Highlights keep every insight connected, so your sources stay organized and easy to trace.
AI suggestions turn selected text into summaries, action items, and next-step questions without leaving the page.
Saved notes stay tied to the exact passage, so you can revisit context without hunting through multiple files.
Searchable highlights make reviews faster, whether you are planning a project or preparing for an exam.
When a key passage stands out, Highlighted text becomes part of your study flow and can be explored with AI chat.
Powerful tools to upload, organize, annotate, sync, and interact with your PDFs, ebooks, and videos across all devices
Upload or import videos, PDFs, ebooks (EPUB, MOBI, PDF), and documents from your device or Google Drive. Organize them into custom collections and access your entire digital library anytime, anywhere, on any device. Keep all your learning materials in one secure cloud location.
Take timeline notes on video lectures and add highlights to PDFs and ebooks. Notes sync across all your devices automatically. Chat with your documents and videos using AI for instant Q&A, summaries, translations, and study assistance. Extract key concepts effortlessly.
Automatically sync your reading and watching progress across all your devices. Start reading an ebook on your laptop, continue on your phone, and finish on your tablet. Track your learning activity with comprehensive stats and analytics. Never lose your place again.
Organize your ebooks, PDFs, videos, and documents into custom collections by topics, projects, courses, or categories. Tag content by author, genre, or subject. Perfect for keeping your digital library structured, searchable, and easily accessible. Create reading lists and learning playlists.
Find exactly what you need instantly with powerful search across all your ebooks, PDFs, videos, documents, transcripts, highlights, and notes. Search by title, author, content, or tags. Never lose track of important content or that perfect quote you highlighted.
Testimonials
Students, professionals, and lifelong learners use ThinkDocu to sync their reading progress, organize their digital libraries, and learn smarter with AI-powered study tools.
I've been searching for a cross-platform ebook reader that actually syncs my reading progress across all devices. ThinkDocu works flawlessly on my laptop, iPad, and Android phone. I can start reading a PDF on my computer and pick up exactly where I left off on my phone. Way better than Kindle for sideloaded books!
Sarah Chen
PhD Candidate · State University
Finally found an EPUB and PDF reader that handles my entire digital library! I uploaded over 200 ebooks (EPUB, MOBI, and PDF files) and organized them into collections. The highlights and notes sync perfectly across devices, and the AI chat helps me study faster. This is what Google Play Books should have been.
Marcus Johnson
Software Engineer · TechFlow Inc
ThinkDocu keeps my lecture rewatching honest. The video progress tracking shows exactly where I left off, and timeline notes let me mark important moments. I can review specific timestamps without scrubbing through hours of content. Essential for online learning!
Maya Anderson
Medical Student · Community College
Best cloud document reader I've found. I keep my study materials organized, highlight passages, and jump between PDFs and ebooks without losing my place. The collections and notes are perfect for focused learning. I switched from Apple Books and never looked back.
Lisa Park
Book Club Organizer · Seattle Readers
The AI chat feature is a game-changer for research. I can ask questions about my uploaded PDFs and videos, and it pulls exact quotes with timestamps or page numbers. Summarizing long documents takes seconds. This has cut my research time in half!
Jenna Peterson
Graduate Researcher · Research Institute
I needed an ebook organizer that works offline and syncs to the cloud. ThinkDocu handles my EPUB library beautifully - I can organize by author, genre, and custom tags. Reading progress syncs when I'm back online. Perfect for my commute where internet is spotty.
David Kim
Product Manager · CloudTech Solutions
My PDFs, ebooks, and educational videos are always with me. I use a tablet for reading, a laptop for research, and everything stays in sync with highlights and bookmarks. Finally, a true digital library I can carry anywhere!
Robert Martinez
High School Teacher · Local School District
Note-taking while reading PDFs and watching lectures has never been easier. I can highlight text in documents, add timeline notes to videos, and search through everything later. The cross-device sync means my study notes are always available. Much better than Evernote + PDF reader combo I used before.
Carlos Diaz
MBA Student · Business School
I upload all my work documents, training videos, and ebooks to ThinkDocu. The smart search finds anything instantly - whether it's in a PDF, video transcript, or my notes. Progress tracking on training videos helps me stay accountable. The library organization is excellent too.
Priya Sharma
Operations Lead · Consulting Group
Switched from Moon+ Reader and haven't regretted it. ThinkDocu's cloud sync is reliable, the EPUB reader is clean and customizable, and having videos in the same library as my ebooks is brilliant. The AI assistant answers questions about what I'm reading - feels like having a study buddy!
James Wilson
Law Student · Regional University
Managing hundreds of PDFs and ebooks for my research was chaos until ThinkDocu. Now everything is organized in collections, searchable, and accessible from any device. Highlights sync instantly, and I can export my annotations. The reading progress sync is accurate to the exact page. Fantastic tool!
Dr. Emily Rodriguez
Research Scientist · BioTech Labs
Best alternative to Calibre's web reader. I can organize my entire ebook collection by author and genre, read on any device, and my reading position always syncs. The mobile experience is smooth, and offline reading works great. Plus the AI chat makes studying so much more efficient.
Ahmed Hassan
Engineering Student · Tech University
Multiple ways to upload and organize your personal ebook library, PDF documents, and video lectures. All formats supported: EPUB, MOBI, PDF, MP4, and more.
Join thousands of students, professionals, and lifelong learners who sync their reading & watching progress, organize their ebooks and PDFs, and learn smarter with AI. Start free today—no credit card required.