# Live collaboration

> Several people on one Vellum canvas, the four roles, and how guests are admitted.

Vellum diagrams saved to the cloud can be edited by several people at once.
Cursors, selections and edits appear live.

## Roles

Access is per-diagram, and the role decides what someone can do.

| Role | Can |
| --- | --- |
| **Owner** | Everything, plus admin: toggle collaboration, mint invites, admit or deny guests |
| **Write** | Full editing, no admin |
| **Read** | Laser pointer, and their own sticky notes on the Notes layer |
| **View** | Presence only. Their cursor is visible and they change nothing |

A reviewer with the Read role can point at things and leave notes without any
risk of moving your shapes. Notes left by others are badged with the author's
name and colour.

## Inviting

Open the collaboration panel from the editor. Each diagram has two invite
links, one granting write and one granting read. Share the one you mean.

## Guests

Someone who is not signed in and follows an invite lands in a **lobby** rather
than the canvas. The owner sees them queued and clicks Allow or Deny. Signed-in
users skip the lobby.

## Where it works

Live collaboration is a Vellum feature. draw.io, Excalidraw and Mermaid tabs
are single-editor.