Standard flashcard dimensions, plus AI cards from your notes
Printing index cards in a standard size is easy. Generating flashcards from your own material takes a few minutes and comes with spaced repetition built in.
Common sizes and a faster option
Most flashcard dimensions people search for come down to a few standard sizes: 3x5 inches, the classic index card; 4x6 inches, which gives more room for longer answers; and 2.5x3.5 inches, about the size of a playing card. These work well if you write cards by hand or buy a pack in a store.
- Index cards are usually 3x5 inches, the most common size for handwritten cards.
- 4x6 inches fits longer definitions or worked steps on one side.
- Digital cards have no physical size limit, so answers can be as long as you need.
- Plus exports PDF, DOCX, Anki and CSV files, so you can print or import cards.
Upload what you already have
Send PDFs, DOCX or PPTX files, plain notes, or photos of pages. Text recognition reads images.
Spaced repetition
Cards come back on a schedule that adjusts to what you forget, so review time goes to the cards that need it.
Quizzes and mind maps too
Multiple choice, true/false and short answer questions come with explanations, and mind maps show how topics connect.
How it works
Add your material
Upload the file or photos you study from.
Review the generated cards
Check the questions and answers, then keep the ones you want.
Study in the browser
Free accounts study online. Plus adds PDF export if you want printable cards.
If you want printed cards, the size matters less than the content. DeckOwl turns your own PDFs, slides, notes or images into question and answer cards, so you spend your time reviewing instead of copying. Printable PDF export is included in the Plus plan.
Cards are only useful if you review them, so spaced repetition is included on every plan. Start with the free plan, which allows 3 generations per month and studying in the browser, and upgrade when you need exports.
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Frequently asked questions
What size are most flashcards?
Standard index cards are 3x5 inches, and 4x6 inches is also common for longer answers. Both are popular for handwritten or printed cards.
How many flashcards should I make for a geometry unit on dimensions?
Aim for one card per term, formula or rule, which often means 20 to 40 cards for a single unit. Split larger topics into smaller sets so each review session stays short.
Can I print DeckOwl flashcards?
Yes, but printable PDF export is a paid feature included in Plus, which costs $39 per year or $7.99 per month. The free plan lets you study cards in the browser.
Is there a free plan?
Yes. The free plan includes 3 generations per month and studying in the browser, and you do not need a credit card to start.
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