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Study with Leitner system flashcards built from your own material

Upload a PDF, slides, notes or a photo of a page and get flashcards you review on a box-based schedule with spaced repetition.

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How the Leitner system works with flashcards

Sorting cards into numbered boxes is the core idea behind the Leitner system, and it works well with Leitner system flashcards made from your own course material. Each correct answer moves a card to a box that is reviewed less often, while a miss sends it back to the first box.

Start every new card in box 1 so it gets reviewed first.
Move a card up one box after each correct answer.
Return a card to box 1 after a miss, no matter which box it was in.
Keep the number of boxes fixed so your daily review load stays predictable.

Example Leitner system flashcards for memorization

In the Leitner system, where does a new card start?In box 1, so it is reviewed most often until you answer it correctly.

What happens to a card you answer wrong in the Leitner system?It moves back to box 1 so you see it again soon.

What happens to a card you answer correctly in the Leitner system?It moves up one box, so its next review comes later.

Who developed the Leitner system?Sebastian Leitner, a German science writer, who described it in his 1972 book So lernt man lernen.

Why does the Leitner system use boxes with growing review gaps?Cards you know well are seen less often, so your review time goes to the cards you are still forgetting.

Generate the full set

From your own material

Upload PDFs, DOCX, PPTX, plain text notes, or photos of pages. Text in images is read with text recognition.

Spaced repetition scheduling

Cards come back on a timed schedule, so the ones you keep missing show up more often than the ones you know.

Quizzes and mind maps too

Check what you learned with multiple choice, true or false, and short answer questions that include explanations.

How it works

Upload your material

Add a PDF, slides, notes, or a photo of a page from your class.

Review the generated cards

Check the flashcards DeckOwl creates and edit anything that needs fixing before you start.

Study on a schedule

Work through your deck in the browser on the Free plan, and export to Anki or CSV on Plus.

The method is simple enough to run on paper with index cards, but sorting and timing get hard to track once a deck reaches hundreds of cards. Generating the cards from lecture slides or a textbook chapter gives you a deck you can review in the same order every day.

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Frequently asked questions

How does the Leitner system decide when to review a card?

Cards sit in numbered boxes, and a correct answer moves a card up to a box that is reviewed less often. A wrong answer sends it back to box 1 so you see it again soon.

How many boxes should a Leitner system have?

Five boxes is the most common setup, though some students use three or more depending on how much they need to retain. Pick a box count you can keep up with every day.

Can DeckOwl make Leitner system flashcards from my notes?

Yes, upload a PDF, slides, notes, or a photo of a page and it generates flashcards you can study in the browser on the Free plan. The Free plan includes 3 generations per month.

Do I need a paid plan to export my flashcards?

Yes, PDF, DOCX, Anki and CSV exports are included in Plus at $39/year or $7.99/month. Students get 40% off with a school email.

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