: How do I convert a diagonal line pattern in my *.psd to a Photoshop pattern? In my psd from designer I have a background like in the red rectangle. This pattern doesn't show up in any

@Vandalay110

Creating a seamlessly repeating pattern image involves making the image yourself, and ensuring it's seamless on all sides in a variety of ways. you can then select it and choose Edit... > Define Pattern.... That adds your chosen image as a pattern to Photoshop's available pattern options.

You can load or save new patterns using the Layer Style popup (double click the empty part of a layer in the layers palette or choose Layer > Layer Style... > Pattern Overlay...) by clicking on the small gearwheel icon when you choose a pattern.

Ensuring your pattern is seamless can be tricky. Sometimes a clever choice of your unit cell is all you need, but it can be much trickier than that. Especially turning a photo image into a seamless pattern will involve copying parts of your unit cell to the opposite end and applying a gradient mask to the copied part.

In css, you could use such a resulting image as a repeating background—no need to specify anything, background-repeat is set to repeat-x and repeat-y by default.

There are alternatives, like making your pattern in all css like with Patternify, a browser-based repeating pattern builder, or using and/or tweaking one of the patterns in the CSS3 Patterns Gallery, among others.

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