Turn any PDF into flashcards with AI
Upload a PDF, lecture slides, or a reading and get a flashcard deck you can review with spaced repetition. Free to start on iPhone, iPad, and the web.
Key takeaways
- Upload a PDF or exported slide deck and BrainLift drafts a flashcard deck from what is on the pages.
- PDFs with selectable text give cleaner cards than scanned pages, and shorter files keep each deck focused.
- Check a few cards against the original file, then review the deck with spaced repetition instead of rereading.
BrainLift reads a PDF you upload, such as lecture slides, a textbook chapter, or a study guide, and turns its content into a flashcard deck. You then review that deck with spaced repetition, so the cards you struggle with come back sooner than the ones you know.
How it works
- Upload your PDF. You pick the file from your phone, tablet, or computer and see it attached and ready before anything is generated.
- Generate the deck. BrainLift drafts cards from the text in the file, and you see each one as a question or term on the front with the answer on the back.
- Review and rate yourself. You flip each card, rate how well you knew it, and the app schedules the next review based on that rating.
What you get
Here is a realistic example from an intro biology slide deck on cell structure.
| Slide bullet in your PDF | Flashcard BrainLift drafts |
|---|---|
| Mitochondria: site of aerobic respiration, produce most of the cell's ATP | Front: Which organelle produces most of a cell's ATP through aerobic respiration? Back: The mitochondrion |
| Ribosomes translate mRNA into protein; found free or on rough ER | Front: What do ribosomes do, and where are they found? Back: They translate mRNA into protein; free in the cytoplasm or bound to rough ER |
| Plant cells have a cell wall made mainly of cellulose | Front: What is the main component of a plant cell wall? Back: Cellulose |
| Lysosomes contain digestive enzymes that break down waste | Front: Which organelle uses digestive enzymes to break down cell waste? Back: The lysosome |
Each card asks one thing, even when a slide bullet crams in two facts.
Tips for better results
- Use PDFs with selectable text when you can. If you can highlight words in the file, the text is clean and the cards tend to be cleaner too. Scanned pages rely on reading an image of text, which is more error prone.
- Split long files before uploading. A full textbook or a semester of slides makes a sprawling deck. Upload one lecture or one chapter at a time so each deck matches one exam topic.
- Export slides to PDF rather than screenshotting them. Exporting keeps the text layer intact, while screenshots turn text into images.
- Remove filler pages. Title slides, agendas, and reference lists add noise. Trimming them first keeps the deck on the material you will be tested on.
- Make a quiz from the same file, too. When you want exam-style practice, generate a quiz from the PDF and choose the question count and difficulty, starting easier for a first pass and going harder the week of the exam.
For a deeper look at choosing what belongs on a card, read how to make flashcards from lecture notes. If your source is a long reading, turning a textbook PDF into practice questions walks through it chapter by chapter.
What it costs
You can start for free, with limits on how much you can generate. Premium removes those limits and costs $6.99 a month, $49.99 a year, or $2.99 a week.
Accuracy
AI can misread a table, merge two ideas, or state something your lecture did not say. Before you review a new deck, open the PDF next to it and check a handful of cards, especially ones with numbers, names, or definitions, then edit or delete anything that does not match. Even with that check, quizzing yourself is a better use of time than rereading slides: a major review of study techniques rated practice testing high utility and rereading low (Dunlosky et al., 2013).
When you are ready, create a free BrainLift account and upload the slides from your next lecture.
Studying for a degree with heavy slide decks? See how BrainLift fits college coursework.
FAQ
What kinds of PDFs work best?
PDFs with selectable text, such as exported slide decks, typed handouts, and digital textbook chapters, usually give the cleanest cards. Scanned PDFs can work, but the results depend on how clear the scan is.
Is there a limit on PDF length?
Very long files are harder to turn into a useful deck, and limits may depend on your plan. Splitting a long document into chapters or lectures is the safest approach and gives you more focused decks.
Can it read handwriting inside a PDF?
If your PDF is a scan of handwritten notes, BrainLift will try to read it, and neat handwriting tends to work better than rushed writing. Check those cards against the page more carefully than you would for typed text.
Can I convert a PDF to flashcards on the web?
Yes. BrainLift has a web app that runs in your browser as well as the iPhone and iPad app. There is no Android app yet, so on Android the web app is the way in.