Up to 100 files at once
Upload your entire semester in one go: a textbook PDF, four weeks of lecture slides, your professor's notes, problem sets, and practice tests. AskSia chats with all of them together, not one at a time.
100 files, one session
EN
AI Summarizer
Summarize anything, with resource cited.
AskSia lets you upload up to 100 documents at once, including PDFs, Word, PowerPoint, Markdown, and scanned handwritten notes. Chat with all of them together. Every answer links back to the exact page of the exact file, with the referenced passage highlighted. Reads 500-page textbooks 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 Summarizer?
AskSia AI Summarizer is a multi-document AI study tool that lets students upload up to 100 files at once, including PDFs, Word docs, PowerPoint decks, Markdown, and scanned handwritten notes, and chat with the whole bundle in one conversation. Every answer carries [N] citation markers that, on hover, reveal the exact page of the exact document with the referenced passage highlighted in yellow. Native OCR handles scans without setup. 500-page textbooks process in one pass. Free to start.
100
files per session
500p
textbook in one pass
OCR
native, zero setup
100%
answers cited to page
Why AskSia
The only summarizer built for a real study session.
Generic summarizers read one file at a time and paraphrase without traceability. AskSia reads your whole library at once and grounds every claim in the exact page.
Scanned PDFs, read perfectly
Drop a scan of your handwritten midterm review, a photocopied textbook chapter, or an image-only PDF, and native OCR runs automatically with no setup or conversion. Handwriting recognition works for typical notebook handwriting across 40+ languages.
OCR, handwriting, zero setup
PDF, Word, PPT, Markdown together
Mixed-format sessions by default. A PDF textbook, PPTX lecture slides, a DOCX essay draft, and an MD study guide can all live in the same conversation, with no conversion, no re-uploading, and no format friction.
Mixed formats, one chat
Cited to the exact page
Every claim in Sia's response carries a [N] citation marker. Hover it to see the exact page of the source document with the referenced passage highlighted in yellow. Click to jump into the original file at that page. Zero friction to verify any claim.
Hover to verify, click to jump
500-page textbooks, 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 included. Ask about Chapter 12 and get citations straight from Chapter 12.
Full textbook, no chunking
Library to study pack in one click
Your whole uploaded bundle becomes a cross-document study guide, definition flashcards, concept-check quiz, or visual map, all traceable back to specific pages via the same citation system. Cross-file, not just per-file.
Study guide, quiz, flashcards
How It Works
From messy folder to cited answers in 30 seconds.
No extension, no conversion, no per-file friction. Just drop your bookshelf.
Step 01
Drop your whole library
Drag up to 100 mixed-format files in one go: PDFs, Word, PowerPoint, Markdown, scanned PDFs, and handwriting included. There is no pre-processing, no conversion, and no per-file size limit on Pro and Super.
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
Sia indexes every page in parallel
AskSia parses each format natively, runs OCR on scans and handwriting, extracts chapters, sections, and slide titles, and builds a unified page-level citation index across your entire library, all in parallel.
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
Ask anything, every answer cited
Chat with all your documents at once. Every claim carries a [N] citation marker. Hover to see the exact page with the referenced passage highlighted. Click to jump into the original file. Generate study guides, flashcards, quizzes, or a visual map in one click.
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
Built for the way students actually study.
500-page textbook prep
Upload the full textbook and ask questions across all chapters. Every answer cites the exact page. No splitting, no chunking, no 'too long for ChatGPT' errors.
Full textbook, one chat
Scanned handwritten notes
Take a photo of your professor's whiteboard or scan your own notebook. Sia OCRs and reasons over handwriting alongside your typed files in the same session, with the same citations.
OCR, handwriting
Multi-paper lit review
Load 30+ research PDFs and ask 'which papers disagree on X?' or 'compare methodology across all studies'. Synthesized answers come back with per-paper citations to every source.
Research synthesis
Full course materials
Drop the syllabus, every lecture's slides, the professor's handouts, and the problem sets. Sia builds a cross-document study map that mirrors your actual course structure.
PDF, PPT, DOCX together
Standardized test prep
SAT, GRE, MCAT, LSAT. Upload 20+ practice tests and official guides, then ask 'which topics show up most?' or 'give me algebra questions from test 7 and 11'.
SAT, GRE, MCAT, LSAT
Cross-lingual study bundles
A Chinese textbook, English lecture slides, and a Korean research paper in one session. Ask in any language, receive answers in any language, with 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 AI document summarizing.
How many documents can I upload at once?
Up to 100 files in a single study session on all plans. You can mix formats freely: a 500-page textbook PDF, a week of lecture slides (PPTX), your professor's Word notes, and scanned handwritten review sheets can all live in the same conversation. Free accounts support 100 files up to 30 pages each; Pro and Super unlock unlimited page length per file.
Does AskSia read scanned PDFs and handwritten notes?
Yes. AskSia runs native OCR on scanned PDFs and handwritten notes automatically, with no pre-processing, no conversion, and no third-party OCR tool. Drop in a scan of your handwritten midterm review, a photocopied textbook chapter, or an image-only PDF, and Sia reads it as cleanly as a native-text PDF. Handwriting recognition works for typical student notebook handwriting across English, Mandarin, Japanese, Korean, and more.
What file formats are supported?
AskSia supports PDF (native and scanned), DOCX, DOC, PPTX, PPT, Markdown, EPUB, TXT, CSV, RTF, plus Google Docs and Google Slides links and public web articles. All formats can be mixed freely in one session: PDF textbook plus PPTX slides plus DOCX essay plus MD notes in the same conversation.
How does the page citation and highlight feature work?
Every bullet and claim in Sia's response carries a small [N] citation marker. On hover, a popover appears showing the source file name, exact page number, and a preview of that page with the referenced passage highlighted in yellow. Click the citation to jump into the original document opened to that page with the highlight preserved. Every answer is verifiable at a glance.
Can it handle a 500-page textbook?
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 a question that references Chapter 12, Sia pulls from the actual Chapter 12 content and cites the exact page. Pro and Super accounts remove per-file length limits entirely, making AskSia the default choice for full-textbook study sessions.
Can I ask questions that span multiple documents?
Yes, that is the core of the product. Ask things like 'compare the definitions of X between the textbook and the professor's notes', 'which practice tests cover topic Y the most?', or 'summarize everything we have on the Calvin cycle across all files'. Sia searches across every uploaded document simultaneously and returns a single synthesized answer with [N] citations to every source, often multiple citations per claim, pointing to different files.
Can I generate flashcards, quizzes, or study guides from my library?
Yes. One click turns your entire uploaded library into a study pack: a cross-document study guide, definition-based flashcards, concept-check quizzes, or a visual concept map. Each card, question, and node is traceable back to the specific page of the specific source file via the same citation system.
Start Today
Your whole bookshelf, in one conversation.
Join 2M+ students at 2000+ universities using AskSia to summarize textbooks, lecture slides, and scanned notes together. Free to start.