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Best free diagramming tools

Free diagramming tools compared. Find the best free option based on features and limitations.

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1
Mermaid Free Open Source

JavaScript-based diagramming tool that renders diagrams from text definitions.

Free Developers wanting text-based diagrams in markdown
Text-Based Markdown Git-Friendly Many Chart Types
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2
Lucidchart Free tier

Intelligent diagramming platform for flowcharts, wireframes, and technical diagrams.

Free for 3 documents · Free Teams wanting professional diagramming and flowcharts
Flowcharts Real-Time Collab Templates Integrations
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3
Draw.io (diagrams.net) Free Open Source

Free, open-source diagramming tool that works in the browser with no account needed.

Free Anyone wanting free, full-featured diagramming
Free No Account Confluence Plugin Many Shapes
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4
tldraw Free Open Source

Open-source collaborative whiteboard with a friendly interface and embeddable SDK.

Free Developers wanting an embeddable whiteboard canvas
Open Source Embeddable Multiplayer SDK
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5
FigJam Free tier

Collaborative whiteboard from Figma for brainstorming, diagramming, and workshops.

Free for 3 FigJam files · Free Figma users wanting collaborative brainstorming and diagramming
Whiteboard Sticky Notes Voting Widgets
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6
Eraser Free tier

Technical design tool for architecture diagrams, design docs, and cloud diagrams.

Free for 5 documents · Free Engineering teams wanting docs-as-diagrams
Architecture Diagrams Cloud Diagrams Docs AI Diagram
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7
Eraser Free

Technical diagramming tool for software architecture, system design, and engineering docs.

Free Engineering teams creating architecture diagrams and technical documentation
Architecture diagrams Diagram-as-code Technical docs AI generation
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8
PlantUML Free Open Source

Open-source tool for creating UML diagrams from plain text descriptions.

Free Software architects who need comprehensive UML diagram support
UML diagrams Text-based IDE integration Open source
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More diagramming lists

All Diagramming tools
8 tools compared
Open source Diagramming tools
4 tools

Comparisons

Mermaid vs Lucidchart
Mermaid vs Lucidchart
Mermaid gives you open source and self-hosting; Lucidchart is a managed service. Which trade-off works for you?
Mermaid vs Draw.io (diagrams.net)
Mermaid vs Draw.io (diagrams.net)
Mermaid is built for developers wanting text-based diagrams in markdown. Draw.io (diagrams.net) is built for anyone wanting free, full-featured diagramming. Pick the one that fits.
Mermaid vs tldraw
Mermaid vs tldraw
Mermaid is built for developers wanting text-based diagrams in markdown. tldraw is built for developers wanting an embeddable whiteboard canvas. Pick the one that fits.
Mermaid vs FigJam
Mermaid vs FigJam
Mermaid gives you open source and self-hosting; FigJam is a managed service. Which trade-off works for you?
Mermaid vs Eraser
Mermaid vs Eraser
Mermaid gives you open source and self-hosting; Eraser is a managed service. Which trade-off works for you?
Mermaid vs
Mermaid vs Eraser
Mermaid gives you open source and self-hosting; Eraser is a managed service. Which trade-off works for you?

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