Any public YouTube URL
Paste the link to any public YouTube video, regular uploads, lectures, podcasts on YouTube, Shorts, or Live replays. AskSia transcribes the audio in minutes and returns a timestamped summary.
URL paste, no setup
EN
AI YouTube Video Summarizer
Summarize any YouTube video, with every claim timestamped.
Paste a YouTube URL into AskSia and read a structured summary in seconds. Every claim links back to the exact second of the video, so you can read fast and check the source in one click. Lectures, Khan Academy, Crash Course, and educational creators in 40+ languages. 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 YouTube Video Summarizer?
AskSia AI YouTube Video Summarizer takes any public YouTube URL and produces a structured summary with timestamps on every claim. Hover a [N] citation to see the source moment with the transcript highlighted; click to jump into the YouTube video at that exact second. Useful for educational YouTube creators (Khan Academy, Crash Course, 3Blue1Brown, MIT OpenCourseWare), recorded class lectures uploaded to YouTube, and conference talks. 40+ languages with translation.
100
files per session
500p
textbook in one pass
OCR
native, zero setup
100%
answers cited to page
Why AskSia
The YouTube summarizer built for studying.
Most YouTube summarizers paraphrase without timestamps. AskSia times-stamps every line back to the exact second, so you can verify, jump, and quote in one click.
Timestamped to the exact second
Every line of the summary carries a [N] marker with a YouTube timestamp. Hover to see the transcript at that moment. Click to jump into the YouTube video at that exact second.
Timestamped citations
Built for educational creators
Tuned for Khan Academy, Crash Course, 3Blue1Brown, MIT OpenCourseWare, and recorded course lectures. Handles technical vocabulary, names, and academic terms better than generic transcribers.
Educational creators
40+ languages with translation
Watch a Mandarin lecture or a Spanish tutorial on YouTube and read the summary in English with the original alongside. AskSia auto-detects the source language and runs translation in parallel.
Auto-detect plus translate
YouTube playlists, one chat
Drop a full YouTube playlist (a course, a series, a lecture week) and ask Sia to compare topics across episodes, find every mention of concept X, or build a cross-video study guide.
Playlist support
From YouTube to study pack
One click turns the summary into definition flashcards, a quiz, a study guide, or a visual concept map. Every card and question links back to the original YouTube timestamp.
Flashcards, quizzes, maps
How It Works
From YouTube link to timestamped summary in minutes.
Just paste the YouTube URL. No browser extension, no manual transcript copy.
Step 01
Paste the YouTube URL
Open the YouTube video, tap Share and Copy Link, then paste it into AskSia. Public YouTube videos transcribe directly from the URL.
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 transcribes and indexes
AskSia transcribes the audio with speaker labels for up to 10 voices, identifies structure, and builds a timestamped citation index for the entire video.
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] timestamp citations. Click any citation to jump into YouTube at that second. Ask Sia for flashcards or a quiz. Export as TXT, DOCX, SRT, or Google Docs.
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 YouTube videos with AskSia.
Khan Academy and Crash Course
Paste a Khan Academy or Crash Course episode and AskSia returns a concept-by-concept summary with timestamps. Generate flashcards from the video and quiz yourself before the test.
Educational YouTube
MIT OpenCourseWare and university lectures
Drop an MIT OCW lecture, a Stanford lecture, or any university course on YouTube. AskSia summarizes with chapter-style timestamps and speaker labels, useful for self-study.
Open-courseware lectures
3Blue1Brown and explainer creators
Math, physics, and CS explainers on YouTube turn into clear summaries with proof outlines and example timestamps. Click any citation to jump straight to the visualization.
Math and science explainers
Recorded class lectures on YouTube
Many professors upload their recorded lectures to YouTube. Paste the link and AskSia summarizes with timestamps, ready for review, accessibility, and exam prep.
Class lectures
Foreign-language YouTube videos
Watch a French history channel, a Japanese tutorial, or a Mandarin course on YouTube and read the English summary alongside, with citations linking to the source moment in the original.
40+ languages
Conference talks and TED on YouTube
Drop a YouTube conference talk or a TED video and AskSia summarizes with speaker-labeled timestamps, useful for citation-ready quotes and research notes.
Conferences and TED
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 YouTube summarizing.
How do I summarize a YouTube video with AskSia?
Open the YouTube video, tap Share and Copy Link, then paste the URL into AskSia. The AI transcribes the audio, identifies up to 10 speakers, and returns a structured summary with timestamps on every claim. Hover any [N] to see the transcript at that moment; click to jump into the YouTube video at the exact second.
Does AskSia work with all YouTube videos?
AskSia summarizes public YouTube videos directly from the URL. For unlisted or private YouTube videos, you can save the MP4 from your own channel or your account's subscriptions and upload the file. AskSia handles the upload the same way and produces the same timestamped summary.
How accurate are the YouTube summary and timestamps?
On clear YouTube audio, AskSia transcribes at 95 percent or higher accuracy. The model handles technical vocabulary, names, and academic terms well, which is useful for educational creators. Timestamps are precise to the second, and every claim is grounded in a [N] citation linking to the source moment.
Can AskSia summarize long YouTube lectures?
Yes. The free plan covers YouTube videos up to 30 minutes per file. AskSia Pro and AskSia Super remove the duration cap, useful for full-length university lectures, multi-hour conference talks on YouTube, and complete course playlists.
Can I summarize a whole YouTube playlist?
Yes. Drop the playlist URLs into one session and AskSia handles each video, then lets you ask cross-video questions like 'which lecture covers X?' or 'compare what each video says about Y'. Synthesized answer with per-video timestamps.
Can AskSia summarize YouTube videos in other languages?
Yes. AskSia summarizes YouTube videos 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 video can be read in English alongside the original, with timestamps preserved.
Can I export the YouTube summary?
Yes. Export the summary as TXT, DOCX, PDF, SRT subtitles, or send to Google Docs or Notion. SRT subtitles are useful for adding captions to your own YouTube uploads. Citations and timestamps are preserved in the export.
Start Today
Paste a YouTube link. Read the lecture in minutes.
Whether Khan Academy, MIT OpenCourseWare, a recorded class lecture, or a conference talk, AskSia summarizes any YouTube video with every claim cited to the exact second.