An AI lecture summarizer that gives you something to study.

A lecture recording summarized as a study guide deck you can revise from.

Drop a recording

1 / 4 · bullets

Key terms

  • Photosynthesis: plants turn light, water and carbon dioxide into glucose and oxygen
  • Cellular respiration: cells break down glucose with oxygen to release energy as ATP
  • Chloroplast and mitochondrion: where each process happens

2 / 4 · table

Photosynthesis vs. cellular respiration

PhotosynthesisCellular respiration
WhereChloroplastsMitochondria
Takes inCarbon dioxide, water, lightGlucose, oxygen
Gives offGlucose, oxygenCarbon dioxide, water, ATP

3 / 4 · bullets

Common mistakes

  • Thinking plants only photosynthesize: they also carry out cellular respiration
  • Mixing up which process takes in oxygen

4 / 4 · bullets

Check yourself

  • Which process releases ATP?
  • Why does a plant need mitochondria as well as chloroplasts?
  • What would happen to oxygen output in the dark?

Example output: a lecture summary as a study guide

Illustrative example for an introductory biology lecture, showing the layouts a Study guide deck uses. Your slides come from what was said in your recording.

For students and trainers · Try 2 decks free

This AI lecture summarizer works from the recording: upload the lecture and get the summary as a study guide deck, with each concept defined, the worked examples kept, common mistakes flagged, key takeaways, and self-test questions to check yourself.

Student writing notes beside a laptop with a sticky note on the screen
Photo: Zen Chung on Pexels

What the summary covers

Each concept, defined

The ideas from the lecture with a plain definition for each, so you're not decoding your own shorthand the night before the exam.

Worked examples

The examples from the lecture, kept with the concept they explain.

Common mistakes

The traps the lecturer warned about, on their own slide.

Takeaways and self-test

The key takeaways, then self-test questions to check what stuck.

How it works

1

Upload the lecture

The audio or video file, or a direct link to the file. YouTube links don't work, so use the file itself.

2

Skip the announcements

The lecture is split into timestamped topics. Uncheck the housekeeping and the tangents.

3

Pick “Study guide”

Get the summary as a deck, edit any slide, and download PowerPoint.

What an AI lecture summarizer should give you

A paragraph that says the lecture covered photosynthesis isn't much use the night before an exam. A summary you can study from keeps the definitions, the worked examples, and the mistakes the lecturer warned about, and then tests you.

That's how this lecture summarizer is built. It starts from the recording, so the summary reflects what was said in the room, and you choose which parts matter before anything is written. The Study guide deck is designed to include definitions, worked examples, common mistakes, key takeaways, and self-test questions.

Before you download, preview every slide: click any text to edit it, reorder or delete slides, or ask Claude to refine a single slide. Pick a slide count of Auto, 5, 10 or 15. You get an editable PowerPoint with no watermark.

Summarize a whole unit, not just one lecture

Before an exam, the question is usually about a unit, not one class. On Pro, you can combine 2 to 10 lecture recordings, up to 6 hours in total, into one deck that shows the patterns across them, how often each idea came up, and a "What's next" slide.

Uploaded recordings are automatically deleted about 24 hours after upload, and generated files after 30 days. We don't train on your files.

When unfill.io isn't the right tool

It needs the recording as a file. YouTube and Vimeo links don't work, and it won't record a lecture live or join an online class. Check your course's rules on recording before you record anything.

It summarizes what was said, not the textbook or the slides on screen, so a topic the lecturer skipped won't appear. If you upload a video, you can add frames from it to the slides, up to 6 per deck. And the summary is an editable PowerPoint deck, not a text document or PDF.

Questions

Can I summarize a YouTube lecture?

Not from the link. YouTube links don't work, so you need the lecture as a file. If you have the audio or video file, upload that.

Is the summary a text document?

No. The summary comes as a study guide deck, an editable PowerPoint you can open in PowerPoint, Keynote or Google Slides.

Does it include practice questions?

Yes. The Study guide deck is designed to end with key takeaways and self-test questions, alongside definitions, worked examples and common mistakes.

How long can a lecture be?

Any length, as long as the file is under 500MB. MP3, MP4, MOV, WAV, M4A, WebM, AAC and OGG all work. On Pro, a combined deck can cover up to 10 lectures, 6 hours in total.

Can I edit the deck?

Yes. Edit any slide in the browser, ask Claude to rewrite it, then download a normal PowerPoint file you can change however you like.

What happens to my recording?

It is used only to build your deck and is automatically deleted about 24 hours after upload. We do not train AI models on your files.

How much does it cost?

Try 2 decks free, no card required. Pro is $19/month or $180/year for 30 decks a month, combining up to 10 recordings into one deck, and share links.

Dad joke break

Why did the student bring a ladder to the lecture?

The lecture was long. Your revision doesn't have to be.

Try 2 decks free, no card required. Editable PowerPoint. No watermark.

Upload a lecture