Astah User's Guide

Create Objects and Lines

Before you start, learn basic operations to create objects and lines.

5 ways to create models

  1. Using Tool Palatte
    Choose an icon you want to create from the tool palatte and then click on a diagram.
    Create an object

  2. Dragging from [Structure Tree]
    Drag a model from the Structure Tree to diagram.
    If you are on Windows, you can also drag a model from the Alias View.
    Create an object

  3. Using Suggest Feature
    Click a mini icon that appears when you have mouse over an object.
    astah suggest feature
    TIPS: What you need to know about the Suggest Feature!

  4. Double-clicking on a digaram
    Directly double-clicking on the diagram creates the following model elements.

    DiagramModel Elements
    Class DiagramClass
    UseCase DiagramUseCase
    Statemachine DiagramState
    Activity DiagramAction
    Sequence DiagramLifeline
    Communication DiagramLifeline
    Component DiagramComponent
    Composite Structure DiagramStructured Class
    Data Flow DiagramProcess Box
    ER DiagramER Entity
    Mind MapRoot Topic
    Requirement DiagramRequirement

  5. Pasting texts from Clipboard
    astah suggest feature

Create Model Elements in a row

There are two ways to create the same model element continously.

  1. Hold [Shift Key] down
    Keep clicking on a diagram with holding [Shift] key down.
  2. Turn on the [Continuous] mode
    Click the [Continuous] mode on the tool palette.
    Continuous mode

Wrap Text

You can wrap text with [SHIFT+ENTER], [ALT+ENTER] or [CTRL+ ENTER].
However you cannot wrap text for some models.


  1. Click [Auto Resize] from models pop-upmenu

  2. Move the knob
    Move any knob that appears at the four corners of the object.
TIPS: Set default size of model elements
You can set default size for all the model elements in the System Properties.

Switch Icons

You can switch the notation of model elements with specific stereotypes from [Icon Notation] menu.
Switch Icon

  1. Normal: Show in box with stereotype in "<<" and ">>".
    Switch Icon
  2. Icon: Show in Astah's standard icon (Such as Actor, Interface, entity, Boundary...etc.)
    Switch Icon
  3. Customize: Show in customized Icon. (How to upload Icon image.)
    Switch Icon

Set Font

You can change font per model element. To set font for the whole project, click here.
  1. Select a model element you want to change the font of then go to [Edit] - [Set Font] or choose font icon.
    Set Font
  2. A font chooser opens, select one you'd like.
    Set Font

Change Color

You can change the color of model element from [Edit] - [Set Color].
Set Color

Color Chooser

The color chooser contains of six image color groups: Aqua, Earth, Nature, Spring, Passion and Winter. You can get goood color combinations by using these color groups. [Favorite] can be used to store your favorite colors up to 10 colors.

Color Chooser

TIPS: Set default color for model elements!
You can set default color for each model element in the System Properties.

Copy Styles

You can copy and paste the style of model elements such as background color of the model element and color of texts...etc.
Copy Style