Presentation room

A two-mode slide presenter built into the page. Present mode shows your deck clean (like PowerPoint); Annotate mode lets you draw and write on top of every slide. Upload PDF or images.

Slide presenter

Two modes: Present (clean) · Annotate (draw on the slide).
Slides: …or drop files here
No deck loaded.
Click Load demo deck for a 4-slide demo, or upload a PDF / images.
— / —

Keyboard shortcuts (in fullscreen): → / Space next · ← previous · Esc exit fullscreen. Annotations are saved per-slide on this device — switch back to a slide and your drawings are still there.

Class chat

Shared files

Drop files here
or click to browse · PDFs, slides, images, anything

    Live room — share video by code

    Instructor clicks Host and shares the code. Students enter the code and click Join. Camera + screen share supported. Direct peer-to-peer — no server needed.
    Code: — Not connected

    How sharing works in this room: the live video room is direct peer-to-peer using WebRTC (free PeerJS cloud signaling). Camera, microphone, and screen share are all live. Chat and files (below) stay in your browser only — for cross-attendee chat use the live room's audio or Zoom/Meet's chat. Best with 2–8 participants per room.

    Live-class checklist

    Before class

    • Export your slide deck as PDF (works in PowerPoint, Keynote, Google Slides)
    • Upload it here using Upload PDF or images
    • Open whiteboard in another tab for live sketches
    • Open 3D molecule viewer for L1.3 / L2.3 / L2.13

    During class

    • Run video/audio in Zoom or Google Meet, share this tab as the screen
    • Use Present mode for clean slides
    • Switch to Annotate when a student asks a question — draw right on the slide
    • Press F for fullscreen, arrow keys to navigate

    After class

    • Annotations persist per-slide while the tab is open
    • Save key whiteboard sketches as PNG and email to students
    • Log attendance (Chemdu coordinator follows up)

    More tools

    Whiteboard

    Draw equations, Lewis structures, and reaction arrows. Includes chemistry stamps, periodic table, lasso, and fullscreen mode.

    Open whiteboard →

    3D molecules

    Show the geometry of any common molecule in 3D, measure bond lengths and angles, and reference orbitals, VSEPR shapes, unit cells, and reaction profiles.

    Open 3D molecules →