Getting Started

line9 renders Mermaid diagrams with significantly better layout quality than the default renderer. This guide walks you through the basics.

Using the web viewer

The fastest way to try line9 is the online diagram viewer. Paste any Mermaid diagram source and see the result instantly — no account or installation required.

Supported diagram types

line9 currently focuses on flowchart diagrams, where the layout quality improvements are most visible:

graph TD
    A[Start] --> B{Decision}
    B -->|Yes| C[Action]
    B -->|No| D[Alternative]
    C --> E[End]
    D --> E

Support for additional diagram types is planned.

Sharing diagrams

Diagrams can be shared via URL. The diagram source is compressed and encoded into the URL fragment, so no server-side storage is needed. Copy the URL from your browser’s address bar to share any diagram.