What’s Up With Sketch’s Scissors Tool?

Turns out it’s hugely helpful and
simple to understand.

Peter Nowell
May 7, 2015 · 6 min read

You may have noticed the “Scissors” tool in Sketch’s toolbar and wondered “what the heck is that?” You may have even played around with it, only to be more perplexed.

When I first experimented with the Scissors tool, I noticed that it could remove the border from one side of a shape. So I thought, “here’s a tool that can be used when I want a border on just 3 sides of a rectangle” — not an uncommon need, actually. I also observed that the Scissors tool could turn any curved segment of a shape into a straight line. But whenever I tried to use the Scissors tool on more than one segment of a shape, I got unexpected results. “What the heck, Sketch! You’re so buggy and unpredictable!” Not quite…

It turned out there was a gap in my understanding about how vector shapes work. Here’s what no one told me:

When you think of a shape, you most likely think of a circle, rectangle, or curved object that can be filled in with a color. But computers think about vector shapes slightly differently; they think of them as paths. Paths have a beginning and end, and a direction that the computer’s pencil travels down.

Let’s take a rectangle for example. The path might begin at the top left corner, move down to a point at the bottom left, then over to the bottom right, then up to the top right corner, before finishing at the same point it started at. What’s important to notice is that the path ends at the same place it begins. That’s called a “closed” path, which is exactly what we’re used to calling “a shape.”

But what if the path ends elsewhere? Perhaps that same rectangle starts at the top left corner and ends at the top right. Then it becomes an “open” path, which in layman’s terms we’re used to calling “a line.”

Computers think of shapes and lines in the exact same way — they’re just paths. Some are open; some are closed.

In Sketch, whether you insert a Shape, a Line, or a Vector, they’re all just paths under the hood. By now you may have guessed what the Scissors tool does — it simply cuts open a path between any two vector points. If you have a closed path (shape), this will open it up (into a line).

Using the Scissors tool is simple:

If instead of opening you’d like to close a path, enter Edit mode (by double clicking the path or selecting “Edit” in the toolbar) and click the “Close Path” button at the top right of the inspector. It’s possible to use the same button to re-open the path, but the Scissors tool offers you more flexibility.

The concept of opening paths is simple, although the results might not always be what you expect. Here are some things to consider:

What You Get with Open Paths

When to Use the Tool

Remember when I described my experience about selectively removing the border from a path segment? Well, that’s not a good use of the Scissors tool. Anytime you’re using a fill, the path should be closed. If you want to control the border separately, I suggest duplicating the shape and using one layer for the border and one for the fill. If you want to hide part of a border or shape, that is best accomplished with a mask.

So when should you use the Scissors tool? There’s only one good answer. When you want to turn a closed path into an open path; to turn a shape into a line. Also, there’s this little trick…

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Peter Nowell

Written by

Designer working across UX, web, branding, & traditional graphic design. Creator of Sketch Master — online training courses for Sketch. pnowell.com

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All about the sketch app

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