Images can instantly elevate a Graphviz diagram. A small, well‑chosen icon communicates meaning faster than text alone and adds visual polish without cluttering the layout.

Image support in the Relationship Visualizer Style Designer makes it easy to define reusable styles that incorporate images cleanly and consistently. In practice, the hardest part is often just finding good image files to use.

Below is a curated list of high‑quality, free icon sources that work beautifully in Graphviz.

Tip: Keep images small

Graphviz produces cleaner layouts when it has space to route edges. Oversized images can restrict the engine, while small SVGs stay crisp at any scale and preserve layout flexibility.

Quick Comparison

Use this quick comparison table to jump directly to the icon category you need and explore the full details in each section.

Category	Best For	Approx. Icons	Standout Strength
General Purpose	Clean, everyday diagrams	300 – 5,000+	Simplicity & consistency
Unified Collections	Maximum variety	200,000+	One‑stop access
Cloud & Enterprise	AWS, Azure, Google, and Microsoft	Hundreds	Official branding & accuracy
Networking & Infrastructure	Network and topology diagrams	Hundreds	Industry‑standard symbols
CRM & Business Platforms	Salesforce ecosystem diagrams	Hundreds	Deep platform alignment
Brand & Technology Logos	Technology & company references	1,000+	Recognizable product logos
Security & Compliance	Security architecture & threat modeling	Hundreds	Specialized security concepts
Healthcare & Medical	Clinical, health, and medical diagrams	Hundreds	Purpose‑built medical symbols
Government, Maps & Standards	Maps, civic, signage, geospatial work	100 – 500+	Clear, standardized visual language
Emojis	Quick prototypes & expressive diagrams	Thousands (OS‑dependent)	Built‑in, lightweight visuals

General-Purpose Icon Libraries

These libraries offer broad, versatile icon sets that work well for most diagrams and everyday Graphviz use.

• Feather Icons
  Minimalist open-source set with ~300 clean, lightweight SVGs. Excellent for a simple and elegant look.

• Lucide Icons
  Beautiful community-driven fork of Feather with 1,600+ consistent icons. Modern and highly customizable.

• Heroicons
  Hand-crafted by the Tailwind CSS team in Outline and Solid styles. Perfect for clean, modern diagrams.

• Phosphor Icons
  Versatile library with over 1,000 icons in 6 weights (Thin to Fill). Extremely flexible.

• Tabler Icons
  Massive collection of 5,000+ high-quality, consistent SVGs with outline and filled variants.

Unified & Massive Collections

These collections bring together huge numbers of icons from many different sources, giving you maximum variety in a single place.

• Iconify
  The ultimate one-stop framework with over 200,000 open-source icons from 200+ popular sets (Material, Font Awesome, Feather, and many more).

• Google Material Icons / Symbols
  Google’s official library with 2,500+ clean, modern icons. Includes customizable variable symbols (outlined, rounded, sharp).

Cloud & Enterprise

These official vendor icon sets are ideal for cloud architecture diagrams where accuracy and product‑specific visuals matter.

• AWS architecture icons
  Official AWS icons representing services and resources. Essential for accurate cloud architecture diagrams.

• Google Cloud product icons
  Google’s official architecture diagram icons.

• Kubernetes Icons Set
  Official Kubernetes pictograms for workloads, controllers, and cluster components.

• Microsoft Azure Architecture icons
  Official Azure product icons. Great for consistent Microsoft cloud visuals.

• Microsoft Cloud Product Logos
  This collection of logos has been built up over the years using both official Microsoft logo packages, as well as hard-to-find places.

• Microsoft Dynamics 365 icons
  Official icons for Dynamics 365 and related business applications.

• Microsoft Power Platform icons
  Official icons for Power Apps, Power Automate, Power BI, Dataverse, and more.

Networking & Infrastructure

These icon sets provide standardized symbols for network topologies, making it easy to create clear and recognizable infrastructure diagrams.

• Cisco Network Topology Icons
  Globally recognized standard for network diagrams. Includes routers, switches, firewalls, and more.

CRM & Business Platforms

These collections offer polished, platform‑specific icons designed for business applications and customer‑focused workflows.

• Salesforce Lightning Design System (SLDS) Icons
  Official polished icons tailored for the Salesforce ecosystem.

• Salesforce Icons (Community)
  Community-curated collection with easy copy-paste SVGs and broader selection.

Brand & Technology Logos

These libraries provide clean, consistent brand and technology logos for diagrams that reference specific tools, services, or companies.

• Simple Icons
  Huge standardized collection of brand and technology logos. Ideal when you need instantly recognizable icons.

Security & Compliance

These icon sets focus on security concepts, risks, and architecture components commonly used in threat modeling and compliance diagrams.

• OWASP Icons (Community)
  Community‑maintained symbols for vulnerabilities, risks, and security concepts. Helpful for threat modeling and security documentation.

Healthcare & Medical

These collections offer purpose‑built medical and clinical symbols suitable for healthcare, research, and public‑health diagrams.

• Health Icons
  A nonprofit, open‑source collection of medical and global‑health symbols. Ideal for healthcare, clinical, and research diagrams.

• Material Design Medical Icons
  Google’s Material Symbols include a full medical category (labs, vitals, devices).

Government, Maps & Standards

These sets include standardized signage, civic symbols, and map‑focused icons designed for geospatial and public‑sector diagrams.

• The Noun Project
  A massive library with many public‑domain and Creative Commons icons, including civic, signage, and map‑related symbols.

• Mapbox Maki Icons
  Clean, minimalist icons designed for maps and geospatial diagrams, including POIs, transportation, and landmarks.

Bonus: Emojis

Emojis are built‑in, lightweight, and great for quick prototypes. However, the same emoji can look noticeably different across operating systems.

Windows and macOS require different emoji fonts

Emoji fonts are operating‑system specific, which means your diagram’s appearance can change depending on where it’s viewed. Always test emoji‑based diagrams on the target platforms to avoid surprises.

Platform	Font Name
Windows	Segoe UI Emoji
macOS	Apple Color Emoji

• OpenMoji
  A consistent, open‑source emoji set available as SVGs — perfect when you want emoji‑style visuals without OS‑specific font differences.

What Are Your Favorite Icon Sources?

I’ve highlighted many of the best free resources, but the icon ecosystem keeps expanding and everyone has their own trusted go‑to sets. What free icon collections do you rely on when building your Graphviz diagrams?

Share your favorites in the comments and help the community discover new gems.