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How To: Create a Seamless Diagonal Pattern in Illustrator

Over the years, I've gotten plenty of emails about how to create a seamless diagonal pattern in Illustrator, so here we go! Illustrator comes with some default pattern brushes, but no diagonal love. Diagonal patterns are a bit more tricky to make than a simple horizontal, or vertical pattern, but with some rock solid alignment, and some manual input into the Transform palette, you'll be making diagonal patterns in no time. Let's get started.

How To: Create a Seamless Diagonal Pattern in Illustrator

1. Start with a “square” artboard.

It doesn't really matter what size but if you want to follow along, I'm using a 600px x 600px artboard.

How To: Create a Seamless Diagonal Pattern in Illustrator

2. Create your vertical line.

Again, the size and shape is up to you here.

How To: Create a Seamless Diagonal Pattern in Illustrator

3. Align your shape to the top right corner

Here we are going to be using the Transform palette to make or shape align exactly to the upper left corner. Select your shape and in the Transform, set the “X” value to 0, and the “Y” value to 600 (or the document size you chose). The middle of your shape should now be aligned exactly to the upper left corner.

How To: Create a Seamless Diagonal Pattern in Illustrator

4. Rotate 45 degrees.

Next, rotate your shape 45 degrees either using your mouse and holding Shift, or right click, and enter the value in manually.

How To: Create a Seamless Diagonal Pattern in Illustrator

5. Duplicate your shape and align it to the opposite corner.

Now we need to duplicate or shape, and align it the same way we did above, but to the opposite corner. Again,select your new shape, and using the Transform palette, set your X value to 600 (or the document size you chose) and the Y value to 0. Now your two shapes should be aligned perfectly to opposite corners of the artboard.

How To: Create a Seamless Diagonal Pattern in Illustrator

6. Make a Blend between the 2 shapes.

Using the Blend tool click on 1 of your shapes, then immediately click on the other to make a blend. Then double click on the Blend tool, and you should see the ‘Blend Options” dialogue box. Set it to “Specified Steps” and then select a number that you think looks good. I recommend making this an odd number. You should have something that resembles the image below.

How To: Create a Seamless Diagonal Pattern in Illustrator

7. Expand your blend.

Select your new blend, and then go to Object > Expand, then click “OK.”

How To: Create a Seamless Diagonal Pattern in Illustrator

8. Create a square to crop with.

Select the Rectangle tool, and click once on the artboard. You can now enter in the exact dimensions you want your square to be. Set it to 600 x 600px (or the document size you chose), and click “OK.”

How To: Create a Seamless Diagonal Pattern in Illustrator

9. Align your square to the artboard.

Select your square, and in the Align palette, make sure you have “Align to Artboard” selected.

How To: Create a Seamless Diagonal Pattern in Illustrator

Now hit these 2 buttons to align your square exactly on top of the artboard.

How To: Create a Seamless Diagonal Pattern in Illustrator

10. Crop.

Do a Select All (Command/Control + A), and then hit the Crop button in the Pathfinder palette.

How To: Create a Seamless Diagonal Pattern in Illustrator

Done!

Now you have a nice, seamless diagonal pattern that can be put to use.

How To: Create a Seamless Diagonal Pattern in Illustrator

If you want to add this pattern as a Pattern Swatch, just select it, and then go to Edit, Define Pattern, and it will appear in your swatches palette.

How To: Create a Seamless Diagonal Pattern in Illustrator

I'm the editor-in-chief of Bittbox.com. I'm a designer and developer by day, and a writer and musician when the feeling strikes. I enjoy vintage advertisements and puzzles with an absurd amount of pieces. Follow me on Twitter.

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