Mermaid for
Block diagrams
Break any system into its parts
Map components, layers, and connections at a high level, with full control over where each block sits.
What is a block diagram?
A block diagram represents a system using labeled blocks connected by lines or arrows. Each block a component, module, or function, and each connection a relationship or data flow. Block diagrams are common in electrical engineering, control systems, and software architecture because they show how a system is organized without implementation detail.
In Mermaid, block diagrams give you control over layout. You set the number of columns, choose how many columns each block spans, and nest blocks inside other blocks to show layers or groupings. That makes block diagrams a better fit than flowcharts when position carries meaning, such as a layered architecture or a network stack.
What you can map
with a
block diagram
High-level system and platform architecture
Application component structure
Data pipelines and transformation stages
Hardware and software system layouts
Integration and dependency maps
API gateway and service topology
Infrastructure overviews
High-level system and platform architecture
Application component structure
Data pipelines and transformation stages
Hardware and software system layouts
Integration and dependency maps
API gateway and service topology
Infrastructure overviews
Who uses block diagrams
on Mermaid
System Architects
Show how a platform is structured before getting into implementation detail.
Developers
Document the high-level shape of a system so new teammates can orient themselves without reading the codebase.
Tech Leads
Show component ownership, integration points, and system boundaries in architecture reviews.
DevOps Engineers
Map infrastructure components and how they connect, from cloud resources to deployment pipelines.
Consultants
Give clients a clear picture of their current state architecture before proposing changes.
When a block diagram is
the right call
Fast, accurate, editable, and actionable.
Describe your idea and get a diagram you can refine, then share with your team instantly.
FAQ
Common questions about building block diagrams in Mermaid.
