Ace
Short answer: don't copy slides onto cards bullet by bullet. Go through the deck and turn each slide's main idea into one or two questions that make you explain, apply or order something, add a card for each diagram, and check every card against what the lecturer actually said. Whether you write them by hand or let an AI tool draft them from the PowerPoint, the cards only help if you answer them from memory over several days.
Why slides make bad flashcards as they are
A lecture slide is a prompt for the person speaking, not a complete explanation. "Na+/K+ pump: 3 out, 2 in, ATP" means a lot when you hear the lecture and very little three weeks later. If you copy it onto a card, you get a card that tests whether you recognise a phrase, not whether you understand what it means.
Bullet points also hide the structure that exams test: why one step leads to the next, how two ideas differ, what happens when a value changes. A card per bullet breaks that structure into disconnected scraps.
And copying feels productive. Dunlosky and colleagues (2013), reviewing ten common study techniques, rated highlighting, rereading and summarising as low utility, and practice testing and spaced practice as high utility. Copying slides is closer to the first group. The cards only start working when you answer them.
How to turn PowerPoint slides into flashcards, step by step
- Go through the deck once without making anything. Note which slides carry a main idea and which are examples, recaps or title slides. Usually only a fraction of slides deserve cards.
- Write the main idea of each important slide as a question. Not "Na+/K+ pump" but "What does the sodium-potassium pump move, in which direction, and what does it cost?"
- Fill the gaps from the lecture. Use the recording, your notes or the textbook to write the full answer. If you can't, that slide needs studying before it needs a card.
- Add one card per diagram. Cover the labels and ask yourself to name the parts, or describe what the diagram shows.
- Add a few "why" and "what if" cards per lecture. These are the ones that separate students who memorised from students who understood.
Our guide to taking lecture notes covers how to capture the explanation in the first place.
Card types that work for slides
- Explain it: "Explain why X happens." Answer in two or three sentences out loud.
- Put it in order: for any slide with steps, shuffle them and rebuild the sequence.
- Compare: "How does X differ from Y?" Good for adjacent slides that look alike.
- Label the diagram: for any figure, hide the labels and name them.
- Apply it: "If Z doubled, what would happen to X?" Especially for formula slides.
Answering in your own words matters. Larsen, Butler and Roediger (2008) note that tests requiring effortful recall, like short answers, help retention more than tests that only need recognition. A card where you produce the answer beats one where you only nod at it.
Using AI to turn slides into flashcards
Several flashcard and AI study apps can import a PowerPoint and draft cards from it, and you can also paste slide text into a general chatbot. This saves time, with three cautions:
- Slides are thin input. If the explanation lived in the lecturer's voice, the AI doesn't have it either. It may fill gaps with general knowledge that doesn't match your course. Add your notes or the transcript where you can.
- Check every card against the deck. Delete anything that isn't from your material or that you can't trace to a slide.
- Watch for recognition-only cards. Rewrite "What is X?" cards into "why" and "how" cards where it matters.
Ace takes a different route to the same goal: it turns your PowerPoint slides (or PDFs, Word documents and YouTube lectures) into practice questions written only from that material, checks each answer against it and shows the sentence from your file that backs it. Depending on what the slides contain, questions can include multiple choice, put-the-steps-in-order and label-the-diagram using a screenshot of the diagram from your own deck. See how it works or our guide to turning lectures into quizzes.
How to use the deck
- Answer before flipping. Every time, even if you are unsure. Roediger and Karpicke (2006) found that practising recall led to substantially better retention a week later than restudying.
- Use one big deck, not many little piles. Kornell (2009) found that studying one large stack of flashcards beat studying the same cards in four smaller stacks, because the larger stack spaces each card out more, and that spacing beat cramming for 90% of participants.
- Come back over several days. A lecture's deck reviewed on days 1, 2, 4 and 7 will do far more than the same time spent in one evening.
Frequently asked questions
How many flashcards should I make per lecture?
There is no fixed number. Aim for a card per main idea and diagram rather than per bullet; for many lectures that is somewhere between ten and thirty.
Can I turn a PowerPoint into flashcards automatically?
Yes, several apps import PPTX files and draft cards. Check each card against your slides and lecture, and rewrite any that only test whether you recognise a term.
Should I study the slides or the flashcards?
Both, in order: understand the slides first (with the lecture or notes), then use the cards to test yourself over the following days.
What if my slides are mostly pictures?
Make diagram cards: hide the labels and name the parts, or describe what the figure shows. Add the explanation from the lecture to the answer side.
Sources
- Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving students' learning with effective learning techniques. Psychological Science in the Public Interest, 14(1), 4–58.
- Larsen, D. P., Butler, A. C., & Roediger, H. L. (2008). Test-enhanced learning in medical education. Medical Education, 42(10), 959–966.
- Roediger, H. L., & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255.
- Kornell, N. (2009). Optimising learning using flashcards: Spacing is more effective than cramming. Applied Cognitive Psychology, 23(9), 1297–1317.
