Blanx: Highlight to blank

About

Blanx lets you turn any PDF into a fill-in-the-blank quiz so you can study by active recall instead of passively re-reading.

Re-reading notes and highlights feels productive, but it's one of the weakest ways to remember anything. Forcing yourself to retrieve the answer (active recall) works far better. Blanx makes it effortless: hide the words you need to know, then quiz yourself on the spot.

HOW IT WORKS
1. Open a PDF. Online PDFs open in Blanx automatically. For PDFs on your computer, click the Blanx toolbar icon and choose "Open PDF".
2. Highlight any word or phrase you want to memorize — it's instantly hidden behind a blank input field.
3. Type your answer into each blank.
4. Click "Check answers" to see which ones you got right.

Click the × on any blank to bring the word back. Or refresh the page to remove all the blanks.

EXAMPLES FOR WHAT YOU CAN USE THIS FOR
- Vocabulary, definitions, and key terms
- Dates, names, and facts
- Formulas and equations
- Anything you'd otherwise re-read passively

WHO IT'S FOR
- Students revising lecture slides, textbook chapters, and study guides
- Language learners drilling vocabulary
- Anyone studying for exams or certifications
- People who learn better by testing themselves than by re-reading

PRIVACY
No ads, no trackers, and we don't sell your data. Read how Blanx handles your information:
https://www.learnology.tech/blanx/privacy-policy

PERMISSIONS
- declarativeNetRequest: redirects online PDF links into the Blanx viewer so the blanking tools
  can run. Local PDFs are opened manually via the Blanx toolbar icon.
- Host access (<all_urls>): required so that online-PDF redirect works regardless of which
  website hosts the PDF. Blanx does not read, modify, or transmit the contents of non-PDF pages.