Is this Verilog Online Compiler free to use?

Yes, Verilog Online Compiler is 100% free to use online with no installation or account required.

How do I run code using Verilog Online Compiler?

Simply type or paste your source code into the editor and click the Run button to view the output in the console.

Can I use Verilog Online Compiler on mobile devices?

Yes, the compiler is fully responsive and compatible with Android, iOS, Windows, macOS, and Linux web browsers.

Verilog Online Compiler / Simulator

Write, test, and simulate Verilog HDL code online directly from your browser with our free Online Verilog Compiler / Simulator. Practice digital logic, modules, testbenches, signal behavior, and simulation output without installing heavy EDA software such as Vivado, ModelSim, or a local Verilog toolchain.

How to Use This Verilog Compiler

Write or paste your Verilog code
Enter your Verilog module or testbench in the Code Editor. You can work with modules, registers, wires, initial blocks, always blocks, and standard simulation statements.
Click the Run button
Select Run to compile and simulate your Verilog code. If there is a syntax or simulation error, review the returned message, correct the HDL code, and run it again.
Check the Output screen
Simulation messages and text generated by commands such as $display appear in the Output panel. You can also use the available controls to copy, download, or clear the output.

Key Features

Free Online Verilog Simulator: Write and simulate Verilog HDL directly in your browser.
Zero Installation: No need to install Vivado, ModelSim, or another local EDA environment for supported exercises.
Instant Simulation: Run HDL code and quickly review simulation results or errors.
Module & Testbench Support: Practice reusable modules and basic verification logic.
Digital Logic Testing: Experiment with combinational and sequential circuit behavior.
Standard Verilog Syntax: Work with module, endmodule, wire, reg, assign, initial, and always.
Simulation Output: Use system tasks such as $display to inspect values and debugging information.
Dark & Light Mode: Switch the Code Editor theme for comfortable HDL development.
Output Controls: Copy, download, or clear simulation output directly from the Output panel.

1. How do I print text or simulate values using $display in Verilog?

Use the $display system task inside an initial or procedural block.

You can also display signal values:

Click Run and check the Output panel to view the simulation message.

2. Do I need to install Vivado or ModelSim to use this tool?

No. You can use this Online Verilog Compiler / Simulator directly from your browser for supported Verilog exercises without installing Vivado, ModelSim, or another local simulation environment.

Full EDA software may still be required for FPGA synthesis, timing analysis, waveform debugging, hardware programming, advanced verification, and production FPGA or ASIC workflows.

3. Does Verilog code require a module and endmodule structure?

For standard Verilog designs, code is normally organized inside a module and closed with endmodule.

A module defines a hardware block and may contain ports, signals, continuous assignments, procedural blocks, and instantiated submodules.

4. Is this online Verilog compiler suitable for testing digital logic and testbenches?

Yes. It is useful for learning and testing basic digital logic, HDL syntax, modules, combinational circuits, sequential logic, and testbench concepts.

For example, you can test an AND gate with a simple testbench:

This makes the tool useful for ECE students, FPGA beginners, hardware engineers, and digital designers who want to practice Verilog simulation without setting up a full local EDA environment.