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Turn any PDF into printable double-sided flashcards

Upload your lecture slides, textbook pages, notes or a photo of a page. DeckOwl writes the cards, and you can study them in the browser with spaced repetition or export them as a printable PDF.

Create flashcards nowFree · No credit card required

Drop files here or browsePDF, DOCX, PPTX, text or photos of your notes · several files with Plus

Free · First set needs no signup · Creates flashcards in seconds

Why double-sided flashcards work for printing

Printed flashcards work best when the front holds one question and the back holds its answer, so you can flip the sheet and test yourself. DeckOwl builds printable double-sided flashcard PDFs from your own material, so the cards cover your course rather than a generic topic list.

Question on the front and answer on the back, ready to print
Generated from your own lecture slides, textbook pages or notes
Photos of printed or handwritten pages read with text recognition
Export to PDF, DOCX, Anki or CSV with Plus

Example biology flashcards for double-sided printing

What is the main function of mitochondria?They produce most of the cell's ATP through cellular respiration.

What is osmosis?The movement of water across a semipermeable membrane from low solute concentration to high solute concentration.

What does one turn of the Krebs cycle produce per acetyl-CoA?3 NADH, 1 FADH2, 1 GTP or ATP, and 2 CO2.

What is a codon?A sequence of three mRNA nucleotides that specifies one amino acid or a stop signal.

How do the outcomes of mitosis and meiosis differ?Mitosis yields two identical diploid cells; meiosis yields four genetically distinct haploid cells.

Generate the full set

Built from your own material

Upload a PDF, DOCX, PPTX, plain text notes or an image. Photos of pages are read with text recognition, so the cards match what your instructor actually covered.

Spaced repetition in the browser

Cards you miss come back sooner and cards you know come back less often, so review time goes toward what you are still forgetting.

Export when you need paper

Plus includes PDF, DOCX, Anki and CSV export, so you can print double-sided cards or move the deck into another app.

How it works

Upload your material

Add a PDF, slide deck, document, notes or photos of pages. No credit card is needed to start.

Review the generated cards

Each card has a question or term on the front and the answer on the back. Edit anything that does not match your course.

Print or study

Export a PDF laid out for double-sided printing on Plus, or study the deck in the browser on any plan.

The double-sided layout is the printed version of the deck. In the browser, the same cards use spaced repetition, so the ones you miss return sooner. PDF export is a Plus feature; the free plan gives you 3 generations a month and browser study without exports.

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Frequently asked questions

How many flashcards should I make for a biology exam?

Make one card per distinct term, fact or process step, and start with whatever your instructor stressed in class. Add cards for anything you missed on practice questions so the deck grows where you need it.

Is a double-sided flashcard layout better than single-sided for studying?

Double-sided cards keep each question and its answer on one sheet, which makes shuffling and self-testing quicker. Either layout works; what matters is that the answer stays hidden until you have tried to recall it.

Can I print DeckOwl flashcards as a PDF?

Yes, PDF export is included with Plus at $39/year or $7.99/month. The free plan lets you study in the browser with 3 generations a month and no exports.

Do students get a discount?

Students with a school email get 40% off, and no credit card is needed to start.

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Keep exploring the topic

Review the main ideas visually or practice recalling them.