Free Schematic Viewer Online — View Circuit Diagrams in Your Browser

View Schematics Without Installing Any Software

Reading a circuit schematic usually means launching a heavy EDA tool like KiCad, Altium, or Eagle. MakerSuite 3D now includes a browser-based schematic viewer that lets you open .kicad_sch files instantly — no installation, no signup, no file uploads. Just drag, drop, and read your circuit diagram.

What Is a Schematic Viewer?

A schematic viewer displays the logical connections between electronic components in a circuit design. Unlike a PCB viewer that shows the physical board layout, a schematic viewer shows the electrical relationships — which pin connects to which net, how power flows through the circuit, and how components are organized into functional blocks. MakerSuite 3D renders schematics on an HTML5 Canvas with smooth panning and zooming, making it easy to explore even complex multi-page designs.

Key Features of the Schematic Viewer

• Canvas 2D Rendering — Schematics are rendered on a high-performance HTML5 Canvas with crisp lines, text, and symbols at any zoom level
• Parts Sidebar — Browse all components in your schematic with reference designators, values, and footprints. Click any part to highlight it on the canvas.
• Nets Sidebar — View all electrical nets in the design. Click a net to highlight every wire segment and pin connection across the entire schematic.
• Power Port Colors — Power nets like VCC, 3V3, 5V, and GND are rendered with distinct colors for quick visual identification of power distribution.
• PNG Export — Save your schematic view as a high-resolution PNG image for documentation, design reviews, or sharing with teammates.
• Multi-Sheet Support — Navigate between schematic sheets for designs that span multiple pages.

How to View a Schematic Online

1. Open pcbviewer.app — Open pcbviewer.app in your browser
2. Drag and drop your .kicad_sch file onto the drop zone
3. The schematic renders instantly on a 2D canvas
4. Use the Parts sidebar to browse components, or the Nets sidebar to trace connections
5. Click any net or component to highlight it across the entire schematic

Supported Schematic Formats

The schematic viewer currently supports KiCad schematic files (.kicad_sch) from KiCad 6, 7, and 8. These files use an S-expression format that the viewer parses entirely in your browser. Support for additional formats is planned for future releases.

Who Needs a Schematic Viewer?

• Hardware engineers reviewing circuit designs from colleagues without installing their EDA tool
• Students studying open-source electronics projects and learning how circuits are designed
• Procurement teams verifying component connections before placing orders
• Technical writers creating documentation who need schematic screenshots
• Code reviewers on GitHub who need to inspect .kicad_sch files in pull requests

Privacy and Security

Like the PCB viewer, the schematic viewer processes everything locally in your browser. Your .kicad_sch files are never uploaded to any server. This makes it safe for proprietary designs and confidential projects.