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
Photosynthesis
Cellular respiration
Where
Chloroplasts
Mitochondria
Takes in
Carbon dioxide, water, light
Glucose, oxygen
Gives off
Glucose, oxygen
Carbon 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.
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.
A plain definition for each concept.
The worked examples from the lecture.
The common mistakes, on their own slide.
Key takeaways and self-test questions at the end.
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.