Pick the right flashcard size and make the cards from your notes
Index cards, pocket cards and printed sheets all work. Upload your own PDFs, slides or notes and DeckOwl builds the flashcards with spaced repetition.
Standard flashcard dimensions and when to use each
Knowing what size flashcards are standard helps you buy the right pack or set up a printed deck, and the most common answer is 3 by 5 inches (about 7.6 by 12.7 cm). That is the classic index card size, small enough to carry and large enough to write a short question on one side and its answer on the other.
- Standard US index cards are 3 by 5 inches, the most common handwritten size.
- 4 by 6 inch cards suit diagrams, formulas and longer answers.
- Pocket cards around 2.5 by 3.5 inches are easy to carry but hold less text.
- One idea per side keeps any size readable during review.
Your own material
Upload a PDF, DOCX, PPTX, text file or photo of a page and get flashcards built from that content.
Spaced repetition
Cards come back at the intervals your memory needs, so you review what you are about to forget.
Export when you need print
Plus exports to PDF and DOCX so you can print cards in the size you choose. Anki and CSV export are included too.
How it works
Upload your notes
Add a PDF, slide deck, document, text file or photo of a page.
Generate your cards
DeckOwl writes flashcards from the material. Review and edit them before you study.
Study or print
Study in the browser on the free plan, or export to PDF on Plus to print cards in your chosen size.
Larger 4 by 6 inch cards give more room for diagrams, longer definitions or formulas. Pocket cards around 2.5 by 3.5 inches match playing card size and suit quick review on the go, but leave less space for writing. Many schools outside the US use A6 (105 by 148 mm), which is close to 4 by 6 inches.
Whatever size you choose, keep one idea per side so the card stays readable. DeckOwl creates cards from your own material, so you can generate a full set and then print or export it in the size that fits your course.
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Frequently asked questions
What size are flashcards most often?
The most common size in the US is 3 by 5 inches, which is the standard index card. Many students also use 4 by 6 inch cards when they need more room.
How much text should go on one flashcard?
Keep each side to a single question, term or fact that you can read at a glance. If an answer runs past two or three lines, split it into two cards.
Can I print my flashcards in a standard size?
Printing and PDF export are part of the Plus plan, which costs $39 per year or $7.99 per month. The free plan lets you study flashcards in the browser with three generations per month.
Is there a free plan to try the flashcard generator?
Yes. No credit card is needed to start, and the free plan includes three generations per month with browser study. Students with a school email get 40 percent off paid plans.
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