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HDLBits
HDLBits provides Verilog practice exercises for learning hardware description and digital logic.
About HDLBits
HDLBits is a set of small circuit design exercises for practicing digital hardware design in Verilog, a hardware description language. Early problems follow a tutorial style, and later problems are intended to be more challenging. Each exercise asks the user to design a small circuit in Verilog and submit it.
The site checks each submitted circuit module by simulating it with a set of test vectors and comparing the results to a reference solution, and it gives immediate feedback. Users can create a username and password to track progress or log in from another browser. The site also includes a web interface for running Icarus Verilog simulations of short pieces of Verilog code.
Key features
- Small circuit design exercises written in Verilog
- Immediate feedback on submitted circuit modules
- Checks submissions by simulating with test vectors against a reference solution
- Problems organized by topic and approximate difficulty
- Web interface for running Icarus Verilog simulations of short code
- Optional username and password to track progress and log in elsewhere
Best for: Students and self-learners who want to practice writing Verilog for digital logic and hardware design.
Good for
- Gives immediate feedback on each submitted circuit
- Exercises are grouped by topic and approximate difficulty
HDLBits at a glance
- Website
- hdlbits.01xz.net
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Open source
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HDLBits FAQ
Where should a new user start?
Start with the "Getting Started" section to learn how the site works, then try the easier problems in each topic. The problems do not need to be done in strict top-to-bottom order.
Can I track my progress?
Yes. Creating a username and password lets you track progress and log in from other browsers.
Can I run Verilog simulations on the site?
The site provides a web interface for running Icarus Verilog simulations. The source describes it as useful for creating shareable simulations of short pieces of Verilog.
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