Several reputable industrial automation companies offer free, high-quality HMI graphics libraries featuring SVGs, PNGs, and specialized symbols for manufacturing, HVAC, and process control. Recommended Free HMI Graphics Libraries Opto 22 SVG and GIF Library : A comprehensive collection of free SVGs, PNGs, and animated GIFs
If you are building a UI on a platform like Qt, WPF, or a proprietary RTOS, you may not need a full framework—just the graphics to populate your buttons.
A completely free, production-ready, industrial-grade HMI graphics library does not exist as a single download. However, by combining Qt open-source framework, MIT‑licensed SVG icon sets, custom canvas drawing, and occasional GPL assets (for non‑commercial use), you can build a professional HMI at zero licensing cost. The trade-off is effort in assembling and testing the visual components. free hmi graphics library
This article explores the best free resources available, how to implement them legally, and why "free" no longer has to mean "ugly."
Specific Sectors: Symbols are categorized for manufacturing, HVAC, and water/wastewater management. The trade-off is effort in assembling and testing
Open Automation Software (OAS): Offers over 5,000 industrial symbols including HVAC, manufacturing conveyors, and process equipment.
When selecting a free HMI graphics library, consider the following features: how to implement them legally
Generic Logic Vector Graphics Library: Offers a Free Community Edition that includes a graphics builder and a library for deploying dynamic visualization displays.