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
. It includes field devices like pumps, valves, and motors, plus HVAC equipment and process sensors. Siemens SIMATIC HMI Template Suite
: Provides expert-designed templates and high-quality icons specifically for TIA Portal and WinCC projects. Open Automation Software (OAS) : Offers a library of common industry symbols for HVAC, water/waste water, and industrial applications free hmi graphics library
. Symbols are available in multiple colors (red, green, blue, etc.) and perspectives. LVGL (Light and Versatile Graphics Library) : An open-source embedded graphics library
for creating modern GUIs on microcontrollers (MCUs) and MPUs. It is highly portable and MIT licensed DIY Design & Customization Tools License: MIT License
If you want to "make a piece" from scratch or modify existing graphics: SIMATIC HMI Template Suite
These libraries provide complete graphical environments. They are ideal if you are building an interface from the ground up and need buttons, sliders, and window management systems. or Apache 2.0 | GUISlice
When selecting a library, evaluate these criteria:
| Feature | Why It Matters | |--------|----------------| | Vector format (SVG) | Scales from 2" to 4K without pixelation | | State-based styling | Shows “pump running” (green) vs “alarm” (red) without swapping images | | Touch-friendly sizing | Minimum 40×40px hit area for finger operation | | Tool compatibility | Works with Ignition Maker, Grafana, Node-RED, FUXA, or your custom Web HMI | | No restrictive license | Avoid GPL if building proprietary hardware – prefer MIT, CC0, or Apache 2.0 |