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How to lock uniform scaling of a text canvas using Fabric.js ?

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In this article, we are going to see how to lock the uniform scaling of a canvas-like text using FabricJS. The canvas means text written is movable, rotatable, resizable and can be stretched. But in this article, we will lock uniform scaling so that it cannot be scaled only vertically or horizontally but to both directions maintaining the default aspect ratio. Further, the text itself cannot be edited like a textbox.
Approach: To make it possible we are going to use a JavaScript library called FabricJS. After importing the library using CDN, we will create a canvas block in the body tag which will contain our text. After this, we will initialize instances of Canvas and Text provided by FabricJS and use the lockUniScaling property to lock uniform scaling and render the Canvas on the Text as given in the example below.


 fabric.Text(text, lockUniScaling: boolean); 

Parameters: This function accepts two parameters as mentioned above and described below:  

  • text: It specifies the text to be written.
  • lockUniScaling: It specifies whether to enable or disable the uniform scaling lock, disabled by default.

Program: We can use FabricJS to lock uniform scaling of a canvas-like text as given below. 


<!DOCTYPE html>
        How to lock uniform scaling of a
        text canvas using Fabric.js?
    <!-- Loading the FabricJS library -->
    <script src=
    <canvas id="canvas" width="600" height="200"
        style="border:1px solid #000000;">
        // Create a new instance of Canvas
        var canvas = new fabric.Canvas("canvas");
        // Create a new Text instance
        var text = new fabric.Text('GeeksforGeeks', {
            lockUniScaling: true
        // Render the text on Canvas


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Last Updated : 06 Sep, 2021
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