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ComfyUI Tutorial

Basic Introduction Install comfyui Text-to-Image Workflow Interface Node Introduction Image Editing Workflow Lora Workflow Filesystem Trouble Shooting
/Node Introduction

Nodes Introduction

In ComfyUI, nodes are the basic building blocks of a workflow. Each node performs a specific task, such as loading a model, processing prompts, sampling images, or saving outputs.

By connecting nodes together, you can build a complete image generation pipeline. This modular design makes ComfyUI flexible and easy to customize.

1. Accessing Nodes (Opening the Node Menu)

ComfyUI provides several ways to open the node browser and add new nodes to your workflow.

1. Double-Click the Canvas

The easiest method is to double-click an empty area of the canvas. This opens the full node browser, where nodes are organized by category such as:

  • conditioning
  • latent
  • image
  • model

2. Right-Click the Canvas

You can also right-click on an empty area and select Add Node.

This opens the same node browser as double-clicking, which can be more convenient for some users.

3. Drag From a Node Output Slot

This method is very useful when building workflows.

  1. Enable Show Links in the top navigation bar.
  2. Click and drag the output slot (the small circle) of an existing node.
  3. Release the connection in an empty area.

ComfyUI will open a filtered node list that only shows nodes compatible with that output type.

For example:

  • Dragging a CLIP output will show nodes that accept CLIP inputs.
  • Dragging a latent output will show nodes that work with latent data.

This makes building workflows much faster.

2. Installing Custom Nodes

The default nodes in ComfyUI are limited. Installing custom nodes greatly expands its capabilities.

Custom nodes can add features such as:

  • ControlNet support
  • Advanced image editing
  • Prompt utilities
  • Batch generation tools

Step-by-Step Installation

  1. Open Manager in the top navigation bar.
  2. Go to the Custom Nodes Manager tab.
  3. You can then:

Install Specific Nodes

Use the search bar to find nodes such as:

  • Efficiency Nodes
  • ComfyUI Image Utils

Click Install, and ComfyUI will automatically download and install them.

Install Missing Nodes

If you load a workflow that requires nodes you don't have:

Click Install Missing Custom Nodes.

ComfyUI will automatically install all required nodes referenced by that workflow.

Important Step

After installing nodes, you must restart ComfyUI. Otherwise, the new nodes will not appear in the node menu.

Recommended Custom Nodes for Beginners

Some node packs are especially useful for beginners:

Efficiency Nodes for ComfyUI

  • Adds workflow shortcuts
  • Includes prompt templates
  • Supports batch processing

ComfyUI Impact Pack

  • Advanced image editing tools
  • Mask processing
  • Style adjustment utilities

Commonly Used Nodes

Preview Image

This node displays generated images inside the canvas without saving them to disk.

It is useful when you want to quickly check intermediate results.

Important Node Differences

Some nodes look similar but are designed for different models.

A common example:

Empty Latent Image vs Empty SD3 Latent Image

Empty Latent Image

  • Standard 4-channel latent space
  • Used for Stable Diffusion 1.5 and SDXL

Empty SD3 Latent Image

  • 16-channel latent space
  • Designed for newer models like SD3 or Flux

Using the wrong latent type may cause workflow errors or poor results.

3. Practical Node Interface Operations

Collapsing Nodes (Keep the Canvas Clean)

Each node has a small gray arrow in the top-right corner.

Clicking it will collapse the node, hiding its parameters and connection slots.

This does not disable the node. The workflow will continue to run normally.

Collapsing nodes is useful when working with large workflows containing many nodes.

Right-Click Node Options

Right-click any node to access additional tools.

Bypass

Temporarily disables the node.

The workflow will skip it and pass input directly to the next node.

This is extremely useful when debugging workflows.

Change Color

You can assign colors to nodes to visually organize your workflow.

Example:

  • Red β†’ Samplers
  • Blue β†’ CLIP nodes
  • Green β†’ Image outputs

Fix Node

Locks the node in place to prevent accidental movement.

Useful in large workflows where layout matters.

Delete

Removes the node from the canvas.

Be careful: deleting nodes may break connections.

Duplicate

Creates a copy of the node.

This is helpful when you want to reuse the same node with slightly different parameters.

Useful Keyboard Shortcuts

Keyboard shortcuts can significantly speed up workflow editing.

Basic shortcuts

  • Delete β†’ Delete selected node
  • Ctrl + C / Ctrl + V β†’ Copy and paste nodes
  • Ctrl + Z β†’ Undo the last action

Workflow editing

  • Ctrl + Drag Mouse β†’ Select multiple nodes
  • Ctrl + G β†’ Group selected nodes
  • Ctrl + B β†’ Bypass selected nodes

You can also select multiple nodes and use the Subgraph button to convert them into a subgraph.

subgraph