Up to 100 PDFs at once
Drop a textbook PDF, lecture-slide PDFs, the professor's notes (also PDF), problem-set PDFs, and practice tests into one session. AskSia chats with all of them together, not one at a time.
100 PDFs, one session
EN
AI PDF Summarizer
Summarize any PDF, with every line cited to the page.
Drop up to 100 PDFs into AskSia at once, native, scanned, or handwritten, and read clean summaries in seconds. Every claim links back to the exact page of the source PDF, with the referenced passage highlighted on hover. Reads 500-page textbook PDFs in one pass. Free to start.
SupportsPDFWordPowerPointMarkdownScanned PDF · OCREPUBTXTCSVGoogle Docs
4.8 / 5 · 2M+ documents summarized by students at 2000+ universities
asksia.ai/summarize
9 files indexed
Study materials
Upload
Library
Selected files
Biology_Chapter_12.pdf
500p
Lecture_Slides_W6.pptx
Prof_Chen_Notes.docx
Handwritten_Review.pdf
OCR
Study_Guide.md
Problem_Set_5.pdf
Research_NeurIPS.pdf
Midterm_Review.docx
Tutorial_Slides.pptx
Midterm study plan — from all 9 of your files
Focus on cellular respiration and the Calvin cycle first — they dominate your textbook1 and lecture slides2. Prof. Chen's notes flag three common exam traps3.
Biology_Chapter_12.pdf
1
5
Lecture_Slides_W6.pptx
2
Prof_Chen_Notes.docx
3
Handwritten_Review.pdf
4
Study_Guide.md
6
≡ Summary
Study guide
Quiz
Flash Card
PDF
Biology_Chapter_12.pdf
p. 217
Quick Answer
What is AskSia AI PDF Summarizer?
AskSia AI PDF Summarizer is a multi-PDF AI study tool that lets you upload up to 100 PDFs at once, including native, scanned, and handwritten PDFs, and chat with all of them in one conversation. Every answer carries [N] citation markers that, on hover, reveal the exact PDF page with the referenced passage highlighted in yellow. Native OCR handles scans without setup, and 500-page textbook PDFs are processed in one pass with chapter structure preserved. Useful for textbook prep, lit reviews, and full-course study.
100
files per session
500p
textbook in one pass
OCR
native, zero setup
100%
answers cited to page
Why AskSia
The PDF summarizer built for full study sessions.
Most PDF chatbots cap at one file or skip scanned pages entirely. AskSia handles up to 100 PDFs at once, scanned and handwritten included, and cites every line back to the exact page.
Scanned and handwritten PDFs, read perfectly
Native OCR runs automatically on image-only PDFs, photocopied chapters, and scanned handwritten notebooks. No setup, no conversion, no third-party OCR needed. Handwriting works across 40+ languages.
OCR, handwriting, zero setup
500-page textbook PDFs, one pass
No chunking, no splitting, no upload-chapter-by-chapter dance. A full 500-page textbook PDF indexes in one pass with chapter structure, figures, tables, and footnotes preserved.
Full textbook, no chunking
Cited to the exact PDF page
Every claim in the summary carries a [N] marker. Hover it to see the exact PDF page with the referenced passage highlighted in yellow. Click to jump into the PDF at that page.
Page-level citations
Cross-PDF questions
Ask 'compare definitions of X across the textbook and lecture-note PDF', 'which problem set covers topic Y?', or 'summarize everything across these PDFs on the Calvin cycle'. Synthesized answer with per-PDF citations.
Cross-PDF Q and A
From PDF library to study pack
One click turns the PDF library into definition flashcards, a concept-check quiz, a cross-PDF study guide, or a visual concept map. Every card links to the original PDF page.
Flashcards, quizzes, maps
How It Works
From PDF folder to cited summary in seconds.
Drag and drop. No conversion, no per-PDF setup, no manual page splitting.
Step 01
Drop your PDFs
Drag up to 100 PDF files into AskSia at once. Native PDFs, scanned PDFs, image-only PDFs, and handwritten note PDFs all work without conversion.
Drop documents here
PDF, Word, PPT, Markdown, scans, and photos
PDF
Biology_Chapter_12.pdf
500p
P
Lecture_Slides_W6.pptx
38
W
Prof_Chen_Notes.docx
12
MD
Study_Guide.md
4
9 files ready · 100 max
Step 02
AskSia indexes every PDF page
AskSia parses native PDFs, runs OCR on scans and handwriting, extracts chapter and section structure, and builds a page-level citation index across every PDF.
Indexing in parallel
PDF
Textbook pages
DONE
P
Lecture slides
DONE
W
Professor notes
DONE
PDF
Handwritten review
OCR
MD
Markdown study guide
READING
100%
Sources indexed with page-level citation anchors.
Step 03
Read, ask, export
Read the structured summary with [N] citations. Hover to see the source page highlighted. Ask Sia for flashcards, a quiz, or a study guide. Export as TXT, DOCX, PDF, Google Docs, or Notion.
What should I study first for the midterm?
Start with cellular respiration1 and the Calvin cycle2. Your handwritten review adds a comparison table4.
Biology_Chapter_12.pdf
p.217
Referenced passage highlighted on the original page.
Use Cases
How students summarize PDFs with AskSia.
Textbook PDFs and chapter scans
Drop a 500-page textbook PDF or scanned chapter into AskSia and ask questions across every chapter. Every answer cites the exact page. No splitting, no chunking, no truncation errors.
Textbook study
Research papers and lit review
Load 30+ research PDFs from JSTOR, arXiv, PubMed, or your library and ask 'which papers disagree on X?' or 'compare methodology'. Synthesized answer with per-paper citations.
Research synthesis
Course-material PDF bundles
Drop the syllabus PDF, every lecture's PDF slides, the professor's PDF handouts, and the problem-set PDFs. Sia builds a cross-PDF study map that mirrors the course structure.
Course materials
Scanned handwritten note PDFs
Photograph or scan your handwritten notebook into a PDF, drop it in alongside your typed PDFs, and Sia OCRs the handwriting and reasons over both with the same citations.
OCR + handwriting
Standardized test prep PDFs
SAT, GRE, MCAT, LSAT. Upload 20+ practice test PDFs and official guide PDFs and ask 'which topics show up most?' or 'give me algebra questions from test 7 and 11'.
SAT, GRE, MCAT, LSAT
Cross-language PDF bundles
A Chinese textbook PDF, English lecture-slide PDFs, and a Korean research PDF in one session. Ask in any language, receive answers in any language, with page-level citations preserved.
40+ language pairs
Compare
AskSia vs. NotebookLM,
ChatPDF, and ChatGPT.
Most AI document tools are built for one file. AskSia is built for students studying a whole library at once.
| Feature | AskSia | NotebookLM | ChatPDF | ChatGPT File Upload |
|---|---|---|---|---|
| Max files per session | ✓ 100 | ~ 50 | 1 | ~ 10–20 |
| Native OCR for scanned PDFs | ✓ Auto, no setup | ~ limited | ✗ | ✗ |
| Handwritten notes recognition | ✓ 40+ languages | ✗ | ✗ | ✗ |
| Mixed-format session (PDF+PPT+DOCX+MD) | ✓ All at once | ~ partial | PDF only | ✓ |
| Hover-to-source page highlighting | ✓ Visual preview | ~ citations only | ~ page ref | ✗ |
| 500-page textbook in one pass | ✓ No chunking | ~ size limits | ~ size limits | ✗ truncation |
| Cross-document Q&A | ✓ Unified answer | ✓ | ✗ single doc | ~ degrades |
| Auto flashcards & quizzes | ✓ One click | ✗ | ✗ | ✗ |
| Free to start, no credit card | ✓ 100 files free | ✓ | ~ 1 file free | ✗ Plus needed |
FAQ
Common questions about PDF summarizing.
How do I summarize a PDF with AskSia?
Drag the PDF into AskSia, or upload it from the mobile app. AskSia parses the PDF (native or scanned), runs OCR if needed, and returns a structured summary with [N] citations on every claim. Hover any [N] to see the exact PDF page with the referenced passage highlighted.
How many PDFs can I upload at once?
Up to 100 PDFs in a single session on all plans. You can mix native, scanned, and handwritten PDFs freely. Free accounts support 100 files at 30 pages each; Pro and Super remove the per-file page cap, useful for full textbook PDFs.
Does AskSia work with scanned and handwritten PDFs?
Yes. AskSia runs native OCR on scanned PDFs and handwritten note PDFs automatically, with no pre-processing or third-party OCR tool. Drop in a scan of your handwritten midterm review or a photocopied textbook chapter, and Sia reads it as cleanly as a native-text PDF. Handwriting recognition works across 40+ languages.
Can AskSia handle a 500-page textbook PDF?
Yes. AskSia processes 500-page textbook PDFs in a single pass, with no splitting or chunking. Chapter structure, figures, tables, and footnotes are all indexed, so when you ask about Chapter 12, Sia pulls from the actual Chapter 12 content and cites the exact page.
How accurate are the citations to PDF pages?
Every claim in the summary is grounded in a [N] citation that points to the exact PDF page with the referenced passage highlighted in yellow on hover. Click the citation to jump into the PDF at that page. The summary will not include any claim it cannot trace back to a specific page.
Can I summarize PDFs in other languages?
Yes. AskSia summarizes PDFs in 40+ languages and detects the source language automatically. You can also translate the summary at the same time, so a Spanish, Mandarin, or French textbook PDF can be read in English alongside the original, with page-level citations preserved.
Can I generate flashcards or quizzes from my PDFs?
Yes. One click turns the PDF library into a cross-PDF study guide, definition flashcards, a concept-check quiz, or a visual concept map. Each card and question links back to the specific PDF page via the same citation system.
Start Today
Drop your PDFs. Read the textbook in minutes.
Whether a 500-page textbook PDF, a stack of research papers, or your scanned handwritten notes, AskSia summarizes any PDF with every claim cited to the exact page.