Line9 – A Mermaid rendering engine with its own layout
Line9 is a new rendering engine for Mermaid flowchart diagrams that aims to remove the need for manual adjustment of layout. Mermaid is a popular text-based language for describing multiple types of diagrams. Several Mermaid rendering engines already exist. Most, like the original mermaid.js, use Dagre or ELK graph drawing libraries to automatically lay out their diagrams. I’ve used Mermaid for the past four years but often recreated my flowcharts in a diagram editor so that I could modify the layout to something that better suited my needs. Use Line9 when you want an automatic flowchart…
Line9 – A Mermaid rendering engine with its own layout launched on August 6, 2026 with 87 votes, #467 of 23,274 launches that month and more than 95% of that year's launches.
In plain words
Line9 is a rendering engine for Mermaid flowchart diagrams designed to automatically arrange diagrams with minimal manual adjustment needed. Unlike existing engines that use Dagre or ELK libraries, Line9 optimizes layouts for clear communication through regular grid spacing, closer positioning of related nodes, and shorter, straighter edges while targeting a page-like aspect ratio. It is for users who create flowcharts from text-based Mermaid syntax and want better automatic layout results without recreating diagrams in separate editors.
written from the facts on this page · September 2026
From the sources
Paste Mermaid, get a Line9 layout. Free online flowchart editor — no account required.
In the maker’s words, at launch
Line9 is a new rendering engine for Mermaid flowchart diagrams that aims to remove the need for manual adjustment of layout. Mermaid is a popular text-based language for describing multiple types of diagrams. Several Mermaid rendering engines already exist. Most, like the original mermaid.js, use Dagre or ELK graph…
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