A textbook summarizer is most reliable when you use it on one text-bearing chapter at a time. Preserve the chapter’s headings, definitions, examples, figure references, and end-of-section questions; create a structured first pass; then compare every important note with the original page. Do not assume support for an entire book, EPUB files, or scanned-PDF text recognition.
Publication and evidence note: Heni Hazbay creates Summarise Visually and may benefit if readers download or subscribe. AI assistance supported research, drafting, and editing. Product claims were reviewed against current first-party project evidence, while reading and study statements were checked against the cited research and university guidance. Heni authorized publication on July 15, 2026. This guide does not claim a whole-book import, EPUB route, scanned-PDF OCR, current-device textbook walkthrough, or textbook accuracy benchmark.
Why chapter-level summarization is the safer unit
A textbook chapter normally has an argument and teaching structure: an opening problem, nested headings, key terms, worked examples, figures, sidebars, checks for understanding, and a chapter review. Sending an undifferentiated block of text to a summarizer can flatten that design. Working one chapter, or one meaningful section of a long chapter, at a time gives you a clear source boundary and makes omissions easier to detect.
Before summarizing, preview the learning objectives, headings, bold terms, figure captions, summaries, and review questions. Cornell University’s reading strategies emphasize purposeful reading, previewing, and asking questions rather than moving passively through text. In this workflow, the preview becomes a checklist for the result: if the original chapter has four main sections but the output represents only three, you have found a gap worth investigating.
This does not mean every heading deserves equal space. Some headings organize a transition; others introduce a central model. The goal is to preserve the hierarchy first, then decide what to condense based on your course purpose.
A textbook summarizer workflow
- Confirm the format and permission. Use a chapter PDF you are allowed to process. The verified Summarise Visually route depends on selectable text exposed by the PDF; it is not an EPUB importer or a way to bypass access controls.
- Set the chapter boundary. Record the book title, edition, authors, chapter number, chapter title, and page range. Different editions can change terminology, examples, and pagination.
- Preview the teaching structure. List the chapter’s main headings, learning objectives, key-term boxes, figures, worked examples, and end questions before generating anything.
- Inspect the extracted text. Check the beginning, middle, and end for missing pages, broken columns, lost symbols, misplaced captions, and text that appears in the wrong order.
- Generate a structured first pass. Ask for headings and concepts to remain distinct. Use Detailed for fuller prose, Key Points for a candidate outline, or Q&A for candidate retrieval prompts.
- Rebuild non-text elements manually. Open every referenced figure, table, equation, map, or diagram. Add what the extracted text did not preserve.
- Verify notes against pages. Attach page numbers and section titles to definitions, mechanisms, claims, and examples. Correct the result directly from the book.
- Study from the checked version. Turn selected notes into questions, attempt answers without looking, and revisit the source when your answer is incomplete.
The chapter boundary also prevents the output from looking more comprehensive than the input. Label it clearly: “Chapter 6, pages 143–176, text and selected figures checked.” That statement is much more informative than “book summary.”
Preserve five kinds of textbook information
1. Headings and relationships
Keep the hierarchy visible: chapter, section, subsection, and topic. A list of isolated facts cannot show whether one idea is a cause, contrast, category, step, or exception to another. After generation, compare the output’s outline with the table of contents and chapter headings.
2. Definitions
Record the term, its defining features, its scope, and its source page. Do not merge a formal definition with a nearby example. When the author distinguishes two similar terms, preserve the contrast in the same note.
3. Examples and worked problems
Label examples as examples. A specific case can illustrate a rule without proving that the rule applies everywhere. For a worked problem, record the initial conditions, each step, the operation or rationale, and the final result. Extracted text may omit mathematical layout or move labels away from the relevant step.
4. Figures, tables, and captions
Treat a figure reference as a signal to reopen the page. The verified PDF path extracts available text; it is not evidence that the app interprets visual relationships inside a graph, anatomical illustration, map, flowchart, or labelled diagram. A caption may survive while the visual evidence it describes does not.
5. Questions and learning objectives
Keep author-provided review questions separate from AI-generated questions. The former reveal what the book explicitly asks; the latter are candidate study prompts that may be useful only after checking. Mark the origin of every question so you do not accidentally attribute generated wording to the textbook.
Using Summarise Visually with a textbook PDF
The current project supports a specific iOS extension handoff. Both inspected extension controllers accept UTType.pdf. The PDF branch creates a PDFKit document, reads the string available from it locally, stores the shared text through the app group, and continues in the main app. Apple documents the PDFDocument.string property used to obtain available text from a PDF document.
This evidence supports a text-bearing PDF chapter workflow. It does not establish a home-screen book library, direct EPUB ingestion, digital-rights-management removal, scanned-page OCR inside the PDF branch, or reliable processing of an entire textbook. The separate project path for shared images does not turn an image-only PDF into supported PDF OCR.
A matching local version 4.2/build 4.3 archive contains both extension binaries, PDFKit linkage, and matching extractPDFText symbols. Apple’s public lookup response reports version 4.2, but it does not expose the App Store-delivered build identity or binary hash. Confirm that the share-sheet route appears in the version installed on your device.
Current project evidence also shows Detailed, Key Points, and Q&A modes. The inspected prompts ask for 5–10 highlights in Key Points and five question-and-answer pairs in Q&A, and the current result view places answers beside questions. That is an output shape, not proof that all important material was captured or that the questions are instructionally appropriate.
Build a checked chapter sheet
Use one row for each consequential item:
| Item type | Generated note | Textbook location | Required check |
|---|---|---|---|
| Heading | Section relationship | Page and heading | Does the hierarchy match the chapter? |
| Definition | Term and meaning | Exact page/paragraph | Are scope and distinguishing features preserved? |
| Example | Case and lesson | Worked example or box | Is it labelled as an example rather than a rule? |
| Figure | Claimed visual takeaway | Figure number and caption | Does the image actually support the note? |
| Question | Prompt and answer | Author question or generated item | Is its origin clear, and is the answer supported? |
After checking, write a brief chapter summary in your own words. Then cover the answer column and attempt the questions. The Cornell Note Taking System provides a useful separation between notes, cues, recitation, reflection, and review. The exact layout is optional; keeping checked notes distinct from test prompts is the important part here.
Karpicke and Blunt found retrieval practice produced stronger learning than the concept-mapping comparison in their reported experiments. Dunlosky and colleagues rated practice testing and distributed practice as high-utility techniques in their evidence review. Neither source studied Summarise Visually, automatically generated textbook summaries, or a universal study schedule. They support attempting recall and returning to checked source material, not trusting an unverified AI question set.
Limits and verification
A textbook summarizer cannot demonstrate completeness merely by producing fluent prose. Verify both what it says and what it leaves out.
- No whole-book claim. This guide recommends a chapter or coherent section as the working unit. Current evidence does not establish an entire-book import, reliable whole-book context, or an unlimited source length.
- No EPUB claim. The verified route concerns PDFs supplied through the iOS extension. An EPUB file, ebook-reader library, or protected digital edition is outside the established path.
- No scanned-PDF OCR claim. The PDF branch reads text exposed by PDFKit. Image-only scanned pages need a separate, lawful recognition workflow and are not presented as supported here.
- Layout can carry meaning. Multi-column pages, sidebars, equations, tables, captions, footnotes, callout boxes, and page-spanning examples can be lost or reordered during text extraction.
- Figures require direct inspection. A text result may mention a figure without preserving axes, labels, spatial relationships, colour coding, or visual comparisons.
- Summaries can overgeneralize. A worked example may become a universal rule; a definition may lose an exception; an author’s hypothesis may be restated as settled fact.
- Questions need checking. Generated Q&A may omit prerequisites, contain a false premise, expose the answer immediately, or emphasize material your course does not assess.
- A summary is not verification. It does not fact-check the textbook, resolve conflicts between editions, confirm citations, or replace your instructor’s requirements.
Check the chapter in two passes. In the claim pass, verify definitions, mechanisms, quantities, dates, named theories, steps, and conclusions. In the coverage pass, compare the result with headings, objectives, figures, examples, sidebars, and end questions. A note can be factually correct but still misleading because a central section is absent.
For a reusable status vocabulary, mark each item supported, unsupported, incomplete, ambiguous, misplaced, or omitted. Record the correction and page rather than asking another model to adjudicate the disagreement. The AI summary accuracy guide explains this approach in more detail.
Frequently asked questions
Can I use a textbook summarizer for a whole book?
This guide does not claim or recommend a whole-book workflow. Process one chapter or coherent section at a time, record the exact edition and page boundary, and check the result before combining notes.
Does Summarise Visually summarize EPUB textbooks?
No EPUB route is established by the current evidence. The documented textbook workflow uses text available from a PDF through the iOS Share or Action extension.
Can it read a scanned textbook PDF?
Not through the verified PDF branch when the pages are images without selectable text. That branch does not perform OCR over image-only PDF pages.
How should I handle textbook figures and tables?
Open each one in the original chapter. Record its number, purpose, axes or labels, main comparison, and relationship to the surrounding text. Do not infer visual meaning from a caption alone.
Should I use Key Points or Q&A for a chapter?
Key Points can create a candidate chapter map; Q&A can create candidate recall prompts. Check both against headings, definitions, examples, figures, and author questions before studying from them.
How can I tell whether a chapter summary is complete?
Compare it with the chapter’s objectives, heading hierarchy, key terms, figures, worked examples, section summaries, and review questions. Completeness is a coverage check, not a feeling produced by polished prose.
Sources and publication evidence
- Apple Developer Documentation,
PDFDocument.string, for the PDF text property used by the verified project path. - Cornell University Learning Strategies Center, “Reading Strategies” and “The Cornell Note Taking System”, for purposeful previewing and separated notes, cues, recitation, and review.
- Karpicke and Blunt, “Retrieval practice produces more learning than elaborative studying with concept mapping”, for the bounded retrieval-practice finding discussed above.
- Dunlosky and colleagues, “Improving Students’ Learning With Effective Learning Techniques”, for the bounded discussion of practice testing and distributed practice.
- Apple, iTunes Lookup response for Summarise Visually, for public version metadata, not delivered-binary identity.
- First-party project and matching-archive evidence supports the qualified PDF handoff and current mode shapes. It does not establish a whole-book import, EPUB route, scanned-PDF OCR, current-device textbook result, or accuracy benchmark. Review standards are documented in the Methodology and Editorial Policy.
Related reading: PDF summarizer for iPhone, research paper summarizer, how to summarize a PDF on iPhone, how to turn a research paper into study notes, and the study hub.