Highlight text on any webpage. Get smart quizzes instantly. Learn with XP, streaks, and badges. Make everything you read stick.
Photosynthesis is a biological process used by many cellular organisms to convert light energy into chemical energy. This energy is stored in sugar molecules through carbon dioxide and water, releasing oxygen as a byproduct. It is largely responsible for producing and maintaining the oxygen content of the atmosphere.
Select text on any webpage, article, or PDF. QuizLens works everywhere you read.
Personalized questions are created in seconds. Multiple choice, fill-in-the-blank, and more.
Answer questions, earn XP, maintain streaks, and collect 50 badges. Learning has never been this fun.
Click the highlighted text below, then hit "Quiz me!"
Human memory is a complex cognitive process that involves encoding, storing, and retrieving information. Research shows that active recall (the practice of actively retrieving information from memory) is significantly more effective for long-term retention than passive re-reading. Studies indicate that students who use active recall retain up to 50% more information after one week. This finding has transformed modern educational approaches.
Pick the correct answer from four options. Classic and effective.
Quick-fire questions to test factual understanding.
Complete sentences with missing key terms. Synonyms accepted.
Write brief responses. Your understanding is evaluated automatically.
Explain concepts in your own words for deeper learning.
Apply, analyze, and synthesize ideas. The ultimate challenge.
Match domain terms to definitions. Great for technical content.
Earn 10-15 XP per question. Level up with progressively harder thresholds. No cap. Keep climbing forever.
Quiz every day to build your streak. Pro users earn automatic streak freezes every 10 days.
Collect badges across 6 categories, from "First Steps" to "Diamond Streak." 5 are secret.
Perfect quizzes, daily firsts, and streak milestones all earn bonus XP to accelerate your progress.
Can't highlight it? Screenshot it. Works on PDFs, images, slides. Anything on screen.
Your content is analyzed and the best mix of question types is picked for maximum learning.
News, Wikipedia, textbooks, documentation, research papers. If you can read it, you can quiz it.
Earn badges for streaks, mastery, exploration, and more. Can you find the 5 secret ones?
...and 32 more to discover
QuizLens is a Chrome extension that turns any text you highlight on the web into a smart quiz. It uses gamification (XP, streaks, badges, and levels) to make learning feel rewarding and fun.
When you highlight text, QuizLens analyzes the content and generates relevant questions at different difficulty levels, from simple recall (multiple choice) to deeper understanding (critical thinking). Pro users get all 7 question types adaptively chosen based on the content.
Yes! The free plan includes 5 quizzes per day with 3 question types and full XP/leveling. No credit card required, no trial period. It's free forever. Pro unlocks unlimited quizzes, all 7 question types, bonus rewards, and more.
QuizLens works on any website where you can select text: Wikipedia, news sites, blogs, documentation, research papers, online textbooks, and more. Pro users can also screenshot PDFs and images that can't be highlighted.
Every question you answer earns XP. 10 XP for recall questions, 15 XP for higher-order thinking. XP accumulates to level you up, with each level requiring progressively more XP. Pro users also earn bonus XP for perfect quizzes, daily firsts, and streak milestones. There's no level cap!
There are 5 hidden badges whose requirements are secret until you earn them. We can't reveal how to get them. That's part of the fun! Keep quizzing, explore different features, and you might stumble upon them. One hint: earning all 49 other badges unlocks the final one.
Absolutely! That's one of the most popular use cases. Students highlight lecture notes, textbook passages, and study guides, then quiz themselves using active recall, which research shows is one of the most effective study techniques. The gamification keeps you motivated through long study sessions.
Go to Settings > Subscription > Manage in the extension. This opens the Stripe Customer Portal where you can cancel anytime. You'll keep Pro access until the end of your billing period, then revert to the free plan with no penalties.
Join thousands of learners using QuizLens to study smarter. Start free today.
"I highlight my lecture notes and QuizLens instantly creates practice tests. My exam scores have gone up significantly since I started using it."
Pre-Med Student
"I have ADHD and staying focused while studying has always been a struggle. The XP and streaks give me that little dopamine hit that keeps me going through my biochem readings. It's the first study tool that actually works with my brain."
Biochemistry Undergrad
"I read tons of technical docs for work. QuizLens helps me actually remember what I read instead of just skimming. The screenshot mode is a game-changer."
Software Engineer