Browser Circuit Simulator and Schematic Editor

A free browser-based electronic circuit simulator with drag-and-drop components, a wire tool, and real-time voltage, current and power readouts. Build circuits with batteries, resistors, LEDs, capacitors, switches and diodes, connect them with wires, and run a DC analysis. Load example circuits or create your own — the simulation runs entirely in your browser.

How to Use the Circuit Simulator

Add components

Tap a component in the palette to drop it on the canvas. Select it to edit its properties — voltage, resistance, forward voltage, and so on.

Connect with wires

Drag from one component terminal to another to draw a wire, or switch to the Wire tool and tap two terminals. Wires follow the components when you move them.

Simulate

Press Simulate to run the DC analysis. Voltage, current and power are shown on each component, current flow is animated through the wires, and LEDs light up from the real current.

Design and simulate electronic circuits with an interactive drag-and-drop editor

Components

Drag components from the palette onto the canvas. Drag from a terminal to another to connect them with a wire, then press Simulate.

Properties

Select a component to edit it, or drag a component from the palette onto the canvas.

Example Circuits

Features

Drag-and-drop schematic editor with snap-to-grid, pan and zoom Wire tool: drag from any terminal to another to connect components Real DC analysis (modified nodal analysis) with per-component voltage, current and power Animated current flow, LED brightness from real current, and clear error detection (short / open / incomplete) Component library: battery, resistor, LED, capacitor, switch, diode, ground Example circuits to learn from: LED driver, voltage divider, series LEDs, RC circuit

FAQ

What components are available?

Battery (voltage source), resistor, LED, capacitor, switch (on/off), diode, and ground. Connect them with the wire tool to build a complete circuit.

How do I connect components?

Drag from one terminal (the small dot at each end of a component) to another terminal to draw a wire. You can also use the Wire tool and tap two terminals. A circuit needs a complete loop and a ground to be solved.

Does it support AC circuits?

Currently only DC simulation is supported. At DC, capacitors are treated as open (fully charged) and the steady-state voltage is shown. AC analysis with frequency response is planned for a future update.

How accurate is the simulation?

The simulator uses node voltage analysis (modified nodal analysis) for DC circuits, with LEDs and diodes modelled by their forward voltage. It is accurate for typical circuits but does not model parasitic or thermal effects.

Can I save my circuit?

Your circuit is saved in your browser automatically, so it is still there when you come back. You can also export the schematic as a PNG image.

Does it work on mobile?

Yes. The canvas supports touch — tap to select, drag to move components, drag from a terminal to wire, and pinch to zoom.

💡 Want us to improve this tool just for you?

We can — and it's free! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.

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Who is this tool for?

Published 06 Apr 2026 Updated 10 Jun 2026