Online Block Diagram Maker

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Create a block diagram easily

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Block diagram maker

What is a Block Diagram and How to Make One

A block diagram is a specialized flowchart used in engineering to visualize a system at a high level. SmartDraw helps you make block diagrams easily with built-in automation and block diagram templates. As you add shapes, they will connect and remain connected even if you need to move or delete items.

Create your block diagram to identify the most important components of your system so you can focus on rapidly pointing out potential trouble spots.

A block diagram is especially useful for visualizing the inputs and outputs of your system, while what happens inbetween can remain in a black box.

Block diagram maker

Top reasons SmartDraw is the ideal block diagram software:

  • Quick-Start Templates
    Dozens of electrical design examples make you instantly productive. Choose a block diagram template that is most similar to your project and customize it to suit your needs.
  • Exhaustive Symbol Library
    You get hundreds of ready-made visuals and templates for electrical switches, sensors, relays, bulbs, analog devices, audio systems, NECA symbols and more!
  • Intelligent Formatting
    SmartDraw helps you align and arrange everything perfectly. And SmartDraw's "intelligent" connecting lines stay attached to your components even when you move them around.
  • Free Support
    Got a question? Call or email us. SmartDraw experts are standing by ready to help, for free!
Block diagram templates

Effortless Collaboration

You and your team can work on the same block diagram by sharing it on your included online account or by using your favorite file sharing apps like Dropbox®, Google Drive, Box® or OneDrive®. You can also share files with non SmartDraw users by simply emailing them a link.

SmartDraw collaboration

Smart Integration

Use SmartDraw to create block diagrams on any device—Windows®, Mac®, Android®, iOS®, or any other platform with an internet connection. Whether you're in the office or on the go, you'll enjoy the full set of features, symbols, and high-quality output you get only with SmartDraw.

When you diagram is complete, share it with your team or clients, by sending them a link, or exporting it as a PDF. You can also insert it into any Office® or G Suite® application in just a few easy clicks.

Export to Office

Create Block Diagrams and More:

  • Electric plans
  • Schematics
  • Circuit panels
  • And other engineering diagrams!

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Discover why SmartDraw is the ideal block diagram maker.