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Turn your notes into a randomized quiz you can retake

DeckOwl writes quiz questions from your own material, with an explanation for every answer, so each review session can use fresh practice.

Create quizzes 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 quizzes in seconds

How a randomized quiz helps you study

Practicing in a fixed order lets you remember where an answer sits instead of what it means. A randomized quiz maker pulls your questions into different combinations, which forces you to recall each concept on its own terms.

Upload PDFs, DOCX, PPTX, text or photos of pages
Get multiple choice, true/false and short answer questions
Read an explanation for every answer
Export to PDF, DOCX, Anki or CSV on Plus, with QTI and Moodle XML on Pro

Example randomization and random sampling quiz questions

What is the main purpose of random assignment in a randomized controlled trial?To spread known and unknown confounding factors evenly across groups. This lets you attribute outcome differences to the intervention.

In a simple random sample, why is every member of the population equally likely to be chosen?Because selection does not depend on any individual characteristic, so no member is favored by the selection process.

Why might a researcher use stratified randomization instead of simple randomization?To keep key subgroups such as sex or clinic site balanced across arms. This matters most in small samples, where chance imbalance is more likely.

What does a randomized block design control for?Known nuisance variables. Participants are grouped into blocks by that variable, and treatments are randomized within each block.

True or false: random sampling guarantees that a small sample exactly matches the population.False. Random sampling reduces bias, but small samples still vary by chance, so they may not match the population exactly.

Generate the full set

Questions from your own files

Upload a PDF, DOCX, PPTX, plain text notes or a photo of a page, and get questions based on that material.

Three question types

Choose multiple choice, true/false or short answer questions, each with an explanation for the correct answer.

Study first, export when ready

Take quizzes in the browser on the free plan. Paid plans add PDF and DOCX export, and Pro adds QTI 2.1 and Moodle XML.

How it works

Upload your material

Add your slides, readings or notes. No credit card is needed to start.

Generate a quiz

Pick the question type and let DeckOwl write questions and explanations from the content.

Retake with new sets

Generate another quiz from the same material to mix up your practice and test recall.

Start with your own lecture slides or chapter notes, then generate a multiple choice or true/false set. Read the explanation after each answer, especially the wrong ones, before you move on.

Random practice works best when you space it out. Review a fresh set a few days after the first attempt, and focus extra time on the questions you missed twice.

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Frequently asked questions

What is the difference between simple random sampling and stratified sampling?

In simple random sampling, every member of the population has an equal chance of selection. In stratified sampling, the population is split into subgroups first, and a random sample is drawn from each subgroup so every group is represented.

Why does random assignment matter in a randomized controlled trial?

Random assignment spreads both known and unknown differences between participants across the treatment and control groups. That makes it more likely that any difference in outcomes comes from the intervention.

Can I export my quizzes on the free plan?

The free plan lets you study quizzes in the browser but does not include exports. PDF and DOCX export start on Plus, and QTI 2.1 and Moodle XML export are on Pro.

Do I need a credit card to try DeckOwl?

No. You can start on the free plan without a credit card, which includes 3 generations per month. Students can also get 40% off a paid plan with a school email.

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