Category
Diagram & Graph Viewers
Mermaid, PlantUML, Graphviz, UML, and mind maps.
Browse 29 free diagram & graph viewers that run entirely in your browser — no signup, no uploads to our servers, and no install. Open any tool below for instant, private processing on EasyToolHub.
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Mermaid Diagram Viewer
Render Mermaid flowcharts and sequence diagrams locally from .mmd, Markdown, JSON, or text — private browser tool for education and research.
PlantUML Viewer
Preview PlantUML class and C4 diagrams locally from .puml, Markdown, JSON, or text — private browser tool for education and research.
Graphviz DOT Viewer
Preview Graphviz DOT layouts locally with SVG export from .dot, .gv, Markdown, JSON, or text — private browser tool for education and research.
UML Viewer
Preview UML class and sequence diagrams locally from .uml, .puml, XMI, Markdown, JSON, or text — private browser tool for education and research.
Class Diagram Viewer
Browse class types, attributes, operations, and relations locally from .puml, .uml, XMI, Markdown, JSON, or text — private browser tool for education and research.
Sequence Diagram Viewer
Preview sequence lifelines and messages locally from .puml, Mermaid, Markdown, JSON, or XML — private browser tool for education and research.
Architecture Diagram Viewer
Browse architecture boxes and connectors locally from .puml, Mermaid, Markdown, JSON, or XML — private browser tool for education and research.
C4 Model Viewer
Browse C4 context, container, and component models locally from PlantUML, Structurizr DSL, Markdown, JSON, or XML — private browser tool for education and research.
GraphML Viewer
Explore GraphML networks locally with rank layout and community detection from .graphml, JSON, or Markdown — private browser tool for education and research.
GEXF Viewer
Explore GEXF dynamic networks locally with timeline slices and community detection from .gexf, JSON, or Markdown — private browser tool for education and research.
Mind Map Viewer
Explore mind maps locally with collapse and search from Markdown, Mermaid, OPML, or JSON — private browser tool for education and research.
FreeMind Viewer
Browse FreeMind .mm maps locally with tree layout and node notes from .mm, JSON, or Markdown — private browser tool for education and research.
Freeplane Viewer
Browse Freeplane .mm maps locally with nodes, builtin icons, and attributes from .mm, JSON, or Markdown — private browser tool for education and research.
Concept Map Viewer
Explore concept maps locally with labeled nodes and links from CmapTools CXL, JSON, Markdown, or DOT — private browser tool for education and research.
ER Diagram Viewer
Browse entity-relationship diagrams locally with entities, PK/FK keys, and cardinalities from PlantUML, Mermaid, JSON, or XML — private browser tool for education and research.
DBML Viewer
Explore DBML schemas locally with tables and refs from .dbml, JSON, or XML — private browser tool for education and research.
SQL Schema Viewer
Browse SQL DDL schemas locally with tables and foreign keys from CREATE TABLE, JSON, or XML — private browser tool for education and research.
Prisma Schema Viewer
Explore Prisma schemas locally with models, @id/@unique fields, and relations from schema.prisma, JSON, or XML — private browser tool for education and research.
Draw.io Viewer
Browse draw.io diagrams locally with pages, shapes, connectors, and zoom from .drawio, .dio, XML, or SVG — private browser tool for education and research.
Visio Viewer
Browse Visio diagrams locally with pages, shapes, and connectors from .vdx, Visio XML, JSON, or Markdown — private browser tool for education and research.
Terraform Graph Viewer
Explore Terraform graphs locally with resources and dependency edges from terraform graph DOT, JSON, or XML — private browser tool for education and research.
Kubernetes Architecture Viewer
Explore Kubernetes architecture locally with workloads, services, ingress routes, and selector links from YAML, JSON, or XML — private browser tool for education and research.
Dependency Graph Viewer
Explore package dependency trees and cycles locally from package-lock.json, yarn.lock, package.json, JSON, or Markdown — private browser tool for education and research.
RDF Viewer
Explore RDF triples and graphs locally from Turtle, RDF/XML, N-Triples, JSON, or Markdown — private browser tool for education and research.
OWL Ontology Viewer
Explore OWL ontologies locally with classes, object/datatype properties, and subclass axioms from .owl, Turtle, JSON, or XML — private browser tool for education and research.
Knowledge Graph Viewer
Explore knowledge graphs locally with entities and relationship links from JSON, XML, CSV, or Markdown — private browser tool for education and research.
State Machine Viewer
Explore SCXML and FSM diagrams locally with states, events, and transitions from .scxml, JSON, XML, or Markdown — private browser tool for education and research.
Decision Tree Viewer
Explore decision trees locally with branches, leaves, and split labels from JSON, XML, CSV, or Markdown — private browser tool for education and research.
Drools Rule Viewer
Inspect Drools .drl rules and when-conditions locally from DRL, JSON, XML, or Markdown — private browser tool for education and research.