Write on your PDFs, and circle anything to get it explained
Annotate lecture PDFs with a pen or your finger, the way you would on paper. oosync can read your handwriting into text, and when something on the page makes no sense, circle it: you get an explanation grounded in your own course materials.
How it works
- Open a PDF from your module in the annotate view.
- Write, underline and draw on the pages; your ink is saved with the document.
- Circle a formula, diagram or paragraph you do not understand to get an explanation.
- Turn handwritten notes into typed text when you want to search or share them.
What you get
Ink on the page
Pen and touch annotation on your PDFs, saved with the document.
Circle to explain
An explanation of exactly the part you circled, drawn from your own sources.
Handwriting to text
The AI reads your writing into text; diagrams are described rather than invented.
Works in the browser
Use a stylus on a tablet or Chromebook, or a mouse or trackpad on a laptop.
Annotating that helps you learn
- Write questions in the margin, not just highlights: a question is something to test yourself on later.
- Draw the diagram from memory next to the printed one, then compare.
- Circle what confuses you as you go, and deal with the explanations in one sitting.
Handwriting recognition works best on clear writing; check the typed version before relying on it.
Questions
Can I handwrite on a PDF and convert it to text?
Yes. Write on the PDF and ask oosync to turn your handwriting into text.
What does circle to explain do?
Circle any part of a page and you get an explanation of that part, drawn from the materials in your module.
Is it free?
Yes. oosync is free to use within daily limits: 2 modules with up to 3 of your own materials each, files up to 60 MB, and daily allowances for AI features.