Edit PDFs, mark papers, add mathematical equations, and reuse structured feedback — all directly in your browser. No uploads. No sign-in required.
3-minute walkthrough of annotations, using library, adding images, and editing PDF files.
Powerful tools designed for marking papers and annotating PDFs
Add beautiful mathematical equations and symbols directly onto your PDFs with full LaTeX support.
Create structured marking schemes with automatic grade calculation. Perfect for exam marking.
Save frequently used comments, feedback, and images. Reuse them across all your documents with one click.
Freehand pen, highlighter, shapes, arrows, and stamps. Everything you need to annotate effectively.
Add, delete, duplicate, and rearrange pages. Merge multiple PDFs. Add custom page templates.
Browser-based. No installation needed. Works on any desktop or laptop with a modern browser.
AI-powered grading suggestions, handwriting recognition (OCR), and intelligent feedback generation.
Annotarium is designed with privacy at its core. Your documents never leave your browser.