How to Generate Terraform Architecture Diagrams Online

If you manage infrastructure with Terraform, you have probably wished for a quick way to visualize what your HCL code actually builds. Reading through hundreds of lines of resource definitions is one thing — seeing the architecture laid out with proper AWS icons, VPC boundaries, and dependency arrows is something else entirely.

The Terraform Diagram Generator does exactly that. Paste your Terraform code, click a button, and get a clean architecture diagram in seconds. It runs entirely in your browser, requires no sign-up, and supports over 50 AWS resource types.

Why Visualize Terraform Code?

Terraform configurations grow fast. A single project can span VPCs, subnets, load balancers, compute instances, databases, and dozens of IAM policies. When you are onboarding a teammate, reviewing a pull request, or planning a migration, a terraform architecture diagram communicates what is happening far more effectively than scrolling through .tf files.

Common scenarios where terraform visualization saves time:

• Architecture reviews — present infrastructure changes in a format everyone understands.
• Documentation — keep diagrams in sync with your actual code instead of maintaining separate draw.io files that go stale.
• Debugging — spot missing dependencies, misconfigured subnets, or orphaned resources at a glance.
• Compliance audits — show auditors exactly how your infrastructure is organized without giving them repository access.

Quick Start: Generate Your First Diagram

Here is the step-by-step workflow for using the terraform diagram generator.

Step 1: Paste Your HCL Code

Open the Terraform Diagram Generator and paste your Terraform configuration into the editor. The tool parses standard HCL syntax and recognizes resource blocks, data sources, variables, and module references.

Here is a simple VPC with an EC2 instance to try:

resource "aws_vpc" "main" {
  cidr_block = "10.0.0.0/16"

  tags = {
    Name = "main-vpc"
  }
}

resource "aws_subnet" "public" {
  vpc_id     = aws_vpc.main.id
  cidr_block = "10.0.1.0/24"

  tags = {
    Name = "public-subnet"
  }
}

resource "aws_instance" "web" {
  ami           = "ami-0c55b159cbfafe1f0"
  instance_type = "t3.micro"
  subnet_id     = aws_subnet.public.id

  tags = {
    Name = "web-server"
  }
}

Step 2: Click Generate

Hit the Generate button. The tool parses your HCL, resolves references between resources, and renders the diagram. You will see each resource displayed with its real AWS service icon — not generic boxes, but the actual icons you would find in AWS documentation.

Step 3: Explore the Diagram

The generated terraform architecture diagram includes several visual layers:

• VPC and subnet grouping — resources are nested inside their parent VPC and subnet boundaries, just like they exist in AWS.
• Dependency arrows — lines connect resources that reference each other, making data flow and dependencies obvious.
• Resource details — click on any resource to see its key attributes, such as instance type, CIDR blocks, or AMI IDs.

Pan, zoom, and rearrange the layout to focus on the parts that matter.

Step 4: Export or Share

When the diagram looks right, export it as PNG or SVG for documentation, slide decks, or wiki pages. You can also generate a shareable URL that lets colleagues view the same diagram without needing to paste the code themselves.

Example: Three-Tier Architecture

Most production workloads follow a layered pattern. Here is a three-tier setup with a load balancer, application servers, and a database:

resource "aws_vpc" "production" {
  cidr_block = "10.0.0.0/16"
}

resource "aws_subnet" "public" {
  vpc_id     = aws_vpc.production.id
  cidr_block = "10.0.1.0/24"
}

resource "aws_subnet" "private_app" {
  vpc_id     = aws_vpc.production.id
  cidr_block = "10.0.2.0/24"
}

resource "aws_subnet" "private_db" {
  vpc_id     = aws_vpc.production.id
  cidr_block = "10.0.3.0/24"
}

resource "aws_lb" "web" {
  name               = "web-alb"
  internal           = false
  load_balancer_type = "application"
  subnets            = [aws_subnet.public.id]
}

resource "aws_instance" "app" {
  count         = 2
  ami           = "ami-0c55b159cbfafe1f0"
  instance_type = "t3.medium"
  subnet_id     = aws_subnet.private_app.id
}

resource "aws_db_instance" "main" {
  engine         = "postgres"
  instance_class = "db.t3.medium"
  db_subnet_group_name = aws_subnet.private_db.id
}

Paste that into the terraform diagram generator and you get a clear visual showing traffic flowing from the ALB through the app tier down to the database — all within proper VPC boundaries.

Example: Serverless Architecture

Serverless setups have their own dependency patterns. Here is an API Gateway backed by Lambda with a DynamoDB table:

resource "aws_dynamodb_table" "orders" {
  name         = "orders"
  billing_mode = "PAY_PER_REQUEST"
  hash_key     = "order_id"

  attribute {
    name = "order_id"
    type = "S"
  }
}

resource "aws_lambda_function" "api_handler" {
  function_name = "order-api-handler"
  runtime       = "nodejs18.x"
  handler       = "index.handler"
  filename      = "lambda.zip"

  environment {
    variables = {
      TABLE_NAME = aws_dynamodb_table.orders.name
    }
  }
}

resource "aws_apigatewayv2_api" "http_api" {
  name          = "orders-api"
  protocol_type = "HTTP"
}

The resulting diagram shows the API Gateway connecting to Lambda, with Lambda referencing the DynamoDB table — a pattern that is immediately recognizable to anyone familiar with AWS serverless.

Key Features at a Glance

The terraform diagram generator is built to handle real-world configurations, not just toy examples.

Real AWS Service Icons

Every resource renders with its official AWS architecture icon. EC2 instances look like EC2 instances. RDS databases look like RDS databases. This makes diagrams instantly readable to anyone who has worked with the AWS console.

50+ Supported Resource Types

The tool recognizes a wide range of AWS resources including VPCs, subnets, security groups, EC2, ECS, EKS, Lambda, API Gateway, RDS, DynamoDB, S3, CloudFront, Route 53, IAM roles, SQS, SNS, ElastiCache, and many more.

Built-In Templates

Not sure where to start? Choose from built-in templates that cover common patterns:

• VPC + EC2 — a basic network with compute instances.
• Three-Tier Architecture — load balancer, app servers, and database across public and private subnets.
• Serverless — API Gateway, Lambda, and DynamoDB.
• Containers — ECS or EKS clusters with supporting infrastructure.
• Static Website — S3, CloudFront, and Route 53 for hosting.

Each template gives you working HCL that you can modify to match your own setup.

Browser-Based, No Installation

Everything runs 100% in your browser. Your Terraform code is never sent to a server. There is nothing to install, no CLI plugin to configure, and no account to create. Open the page and start generating diagrams.

Export and Sharing

Download diagrams as PNG for quick sharing or SVG for high-quality documentation. Shareable URLs let you send a diagram link to a colleague without them needing to paste the code.

Tips for Better Diagrams

• Use meaningful resource names — aws_instance.web_server produces a more readable diagram than aws_instance.this.
• Include tags — the tool displays Name tags when available, making resources easier to identify.
• Keep related resources in one file — the tool parses everything in the editor as a single configuration, so paste all related resources together for the best result.

Start Generating Terraform Diagrams

Whether you are documenting an existing project, reviewing infrastructure changes, or planning a new deployment, a visual diagram makes the conversation easier. The Terraform Diagram Generator is free, runs in your browser, and takes about ten seconds to produce a result.

Open the tool, paste your HCL, and see your infrastructure come to life. Try the Terraform Diagram Generator now.