Shelf feature
Highlight as you read
Mark passages on pages you uploaded. Colors persist on the document for later revision and feed into Tutor when you ask from a selection.
What you get
- Text selection highlights on processed PDFs
- Ask Tutor on a highlighted passage or the full page
- Smooth PDF.js reader with zoom and progress
- Works with your private uploads — not a public catalog
Shelf treats highlights as first-class study data. Select a paragraph, pick a color, and return weeks later — the marks are still there when you reopen the page.
From any highlight you can jump straight into Tutor for explanations, summaries, or follow-up questions grounded in that passage.