Free Diagram Makers Online
Create professional diagrams using simple text syntax. Choose your diagram type and start building.
Flowchart
Design process flows, decision trees, and workflows with our intuitive flowchart editor.
Sequence Diagram
Visualize system interactions, API calls, and message flows between components.
Class Diagram
Design object-oriented structures with classes, interfaces, inheritance, and associations.
ER Diagram
Design database schemas with entities, attributes, and relationships. Import SQL CREATE TABLE statements to auto-generate diagrams, or write Mermaid ER syntax directly.
Gantt Chart
Plan projects, track timelines, and visualize task dependencies with Gantt charts.
State Diagram
Visualize state transitions, finite automata, and system behavior with state diagrams.
Pie Chart
Visualize data distributions and percentages with simple pie charts.
Mind Map
Brainstorm ideas, organize thoughts, and visualize concepts with mind maps.
User Journey Map
Visualize user experiences, satisfaction scores, and touchpoints across tasks and sections.
Quadrant Chart
Plot items on two axes to create priority matrices, competitive analyses, and strategic frameworks.
Requirement Diagram
Visualize system requirements, trace relationships, and document verification methods.
Git Graph
Visualize git branching strategies, merges, cherry-picks, and commit history.
C4 Diagram
Visualize software architecture at multiple levels with the C4 model — context, containers, and components.
Timeline Diagram
Visualize chronological events, milestones, and historical sequences with timeline diagrams.
ZenUML Diagram
Write sequence diagrams with intuitive, code-like ZenUML syntax for clearer system interactions.
Sankey Diagram
Visualize flow quantities, energy transfers, and resource allocation with Sankey diagrams.
XY Chart
Build bar charts and line charts with custom data using simple Mermaid syntax.
Block Diagram
Design system architectures, hardware layouts, and component diagrams with flexible block arrangements.
Packet Diagram
Visualize network protocol headers, packet structures, and binary data formats.
Kanban Board
Visualize task boards, workflow stages, and project status with Kanban board diagrams.
Architecture Diagram
Visualize cloud infrastructure, service architectures, and system design with architecture diagrams.
Why Use Mermaid Diagrams?
Text-Based
Write diagrams as code. Version control friendly, easy to edit, and no proprietary formats.
Export Anywhere
Export as PNG for documents, SVG for web, or PDF for print. High resolution output.
Free Forever
No signup, no watermarks, no limits. Just create and export your diagrams.