Camera

[jbmanning5]

My reason for suggesting that wasn’t arbitrary. You’ll see the 12x20 suggestion pop up fairly often… but the reason was stated quite a while back (Jan 2017).

Here’s the original post behind it:

We built a quick little hopper item

While we have a lot of work in the hopper to help with positioning, we did make one invisible but handy change now. If you upload an artboard or SVG canvas that is the magic dimensions 12x20, the UI will override its automatic placement of the contents and pin the top-left corner of the artboard to the top-left corner of the screen. This little workaround makes it easier to use jigs, if you so desire. I haven’t tried it myself, but something tells me @takitus will give it a whirl soon. …

Also, it’s been noted that in cases where a program creates a unitless SVG file (which does happen), this allows the UI to properly scale the artwork. You can actually use any 3x5 aspect ratio, but 12x20 is easy to remember and design to.