Best AI Tools for Summarizing
This list is for students, researchers, professionals and busy readers who want the key points from long documents, videos, meetings or research papers quickly. When choosing, think about what you summarise most often: PDFs, YouTube lectures, online meetings or academic papers. Check whether the tool gives timestamps or citations so you can verify points, and whether it exports notes. Free and freemium tools are marked, so you can find one that fits your study or work routine.
Free to start: NotebookLM, ChatPDF, Otter.ai, Fathom, tl;dv
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Why it's here: A free Google assistant that studies your uploaded sources, explains complex topics and turns them into new formats.
NotebookLM, now presented as Gemini Notebook, is Google's AI research assistant that studies your sources and helps make complex material easier to understand.
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Why it's here: Summarises PDFs, files, videos and websites and lets you ask follow-up questions, with desktop and mobile apps.
Chat with any PDF, file, video or website to get summaries and answers to your questions about the content.
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Why it's here: Transcribes conversations in real time and creates meeting summaries and action items, useful for classes and teams.
An AI meeting assistant that transcribes conversations in real time and creates summaries, insights and action items.
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Why it's here: Records and summarises Zoom, Google Meet and Teams calls automatically, giving instant AI summaries after each meeting.
An AI notetaker that records, transcribes and summarises Zoom, Google Meet and Microsoft Teams calls automatically.
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Why it's here: A meeting notetaker that records, transcribes and summarises calls on Zoom, Meet and Teams for busy teams.
An AI meeting notetaker that records, transcribes and summarises Zoom, Google Meet and Microsoft Teams calls for busy teams.
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Why it's here: Summarises YouTube videos with key points, timestamped summaries and transcripts, great for students reviewing lectures.
A YouTube video summarizer that gives you key points, timestamped summaries and transcripts so you can skip long videos.
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Why it's here: A free tool that summarises YouTube, TikTok, Instagram and MP4 videos in multiple languages, no sign-up needed.
A free online tool that turns YouTube, TikTok, Instagram, MP4 and meeting videos into clear summaries and transcripts in many languages.
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Why it's here: Turns your files into a searchable knowledge base for summaries, comparisons and cited answers across many documents.
An AI document assistant that turns your files into a searchable knowledge base for summaries, comparisons and cited answers.
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Why it's here: Summarises scientific articles and research papers and includes a reference manager for university students.
An AI tool that summarises scientific articles and research papers in seconds, with a built-in reference and document manager.
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Why it's here: A free browser-based PDF summariser that reads long documents and pulls out the key points.
An AI PDF summarizer that reads long documents and gives you the key points in seconds.
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Why it's here: Summarises videos, audio and documents, transcribes in many languages and builds mind maps and knowledge cards.
Summarises and transcribes videos, audio and documents, and helps you build a personal AI knowledge base from them.
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Why it's here: Turns documents, videos, audio and web pages into summaries and visual mind maps, handy for revision.
AI mind mapping and whiteboard app that turns documents, videos, audio and web pages into summaries and visual maps.
Frequently asked questions
Can AI summarise a whole book or long PDF?
Many tools can handle long documents, though some have page or file size limits on free plans. For important material, read key sections yourself, as summaries can miss details or context.
Are AI summaries accurate?
They are usually a good overview but can leave out nuance or occasionally misstate points. Tools that link summary points to the source or give timestamps make it easier to check.
Is it okay to use AI summaries for studying?
Summaries are useful for revision and deciding what to read closely, but they should not replace reading assigned material. Check your institution's rules if you plan to use summaries in submitted work.
Are there free AI summarisers?
Yes. Several tools on this list are free, and many others offer a free plan with limited summaries or file sizes. Try a few with the type of content you summarise most.
More lists
Plans and features change often; confirm on each tool's official website. Last updated September 24, 2026.
