How to Use Knife Tool in Adobe Illustrator

Knife tool? Sounds like a stranger. It’s one of the tools that you don’t think of when you create designs but it’s quite useful and easy to learn.

You can use the knife tool to divide parts of a shape or text to make different edits, separate shapes, and cut out a shape. For example, I love using this tool to make text effects because I can play with the color and the alignment of individual parts of the shape. 

In this tutorial, I’m going to show you how to use the Knife tool to cut objects and text in Adobe Illustrator.

Note: all screenshots from this tutorial are taken from Adobe Illustrator CC 2022. Windows or other versions can look different. 

Using the Knife Tool to Cut Objects

You can cut or divide any vector shapes using the Knife tool. If you want to cut a shape from a raster image, you’ll need to trace it and make it editable first. 

Step 1: Create a shape in Adobe Illustrator. For example, I used the Ellipse Tool (L) to draw a circle.

Step 2: Choose the Knife tool from the toolbar. You can find the Knife tool under the Eraser Tool. There isn’t a keyboard shortcut for the Knife tool. 

Draw through the shape to cut. You can make a freehand cut or straight cut. The path you draw will determine the cut path/shape.

Note: If you want to separate the shapes, you must draw through the entire shape.  

If you want to cut in a straight line, hold the Option key (Alt for Windows users) while you draw. 

Step 3: Use the Selection Tool (V) to select the shape and edit it. Here I selected the top part and changed its color.

You can also separate the parts you cut.

You can use the knife to cut multiple times on a shape. 

Using the Knife Tool to Cut Text

When you use the Knife tool to cut text, you have to outline the text first because it doesn’t work on the live text. Any text you add to your document using the Type Tool is live text. If you see this line under your text, then you’ll need to outline the text before using the Knife tool.

Step 1: Select the text, and press Shift + Command + O to create an outline. 

Step 2: Select the outlined text, click on the Ungroup option under Properties > Quick Actions

Step 3: Select the Knife tool, click and draw through the text. You will see a cut line. 

Now you can select the individual parts and edit them. 

If you want to separate the cut parts, you can use the selection tool to select the parts you want to separate, group them, and move them. 

For example, I grouped the top part of the text moved it up. 

Then I grouped the bottom parts together and change them to a different color. 

See? You can use the knife tool to make cool effects.

Conclusion

Just a couple of things to keep in mind. If you want to cut text, you must outline the text first, otherwise, the knife tool wouldn’t work. Remember the knife tool is used to edit/cut paths and anchor points so if you’re image is raster, you’ll have to vectorize it first. 

About June Escalada
Graduated from Creative Advertising major, worked more than eight years as a graphic designer focusing in branding and Illustration. Yes, Adobe Illustrator is my best friend and I’m passionate about art and design.

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