Getting your roblox uicorner radius pixels just right can make the difference between a UI that looks professional and one that feels like a prototype from 2012. If you've ever stared at a sharp, blocky button and felt like it was just a bit too aggressive for your game's vibe, you aren't alone. Modern UI design has leaned heavily into "soft" aesthetics, and on Roblox, the UICorner object is the magic wand that makes those smooth edges happen.
When we talk about rounding corners, we're really talking about a balance of math and style. It seems simple on the surface—just add a UICorner, and boom, rounded edges. But once you start diving into the properties, specifically the difference between scale and offset, things can get a little tricky.
Why Rounded Corners Matter
Let's be real: sharp corners are a bit old-school. Unless you're going for a very specific retro-tech or brutalist look, most modern games use some degree of rounding. It's easier on the eyes and helps UI elements feel more like physical objects.
When you manipulate roblox uicorner radius pixels, you're essentially telling the engine how much of the corner should be cut away to create that curve. A small radius gives you a subtle, high-end look, while a large radius can turn a square button into a "pill" shape. The key is consistency. If your main menu has 8-pixel rounded corners, but your inventory has 20-pixel rounded corners, the whole game starts to feel a bit disjointed.
Scale vs. Offset: The Great Debate
The CornerRadius property in Roblox uses a UDim value, which consists of two parts: Scale and Offset. This is where most developers get a little tripped up.
Offset is where you define your radius in literal pixels. If you set it to 12, the corner will have a 12-pixel curve regardless of how big the button is. This is usually what people mean when they search for roblox uicorner radius pixels. It's predictable. Whether the button is tiny or huge, that 12-pixel curve stays exactly the same.
Scale, on the other hand, is a percentage of the element's size. If you set the scale to 0.5, you're basically making the corner radius half the size of the element. If the element is a square, a 0.5 scale will turn it into a perfect circle.
So, which one should you use? Most of the time, you'll want to stick with Offset. Why? Because if you use Scale, your corners will look different depending on the device. A button might look perfectly rounded on a desktop monitor but look like a weird, stretched oval on a phone. By using fixed pixels, you ensure that the "feel" of your UI remains consistent across the board.
Finding the "Sweet Spot" for Radius Pixels
There isn't a "correct" number for your roblox uicorner radius pixels, but there are definitely some industry standards that just look right.
- 4-6 Pixels: This is for that very subtle, "is it even rounded?" look. It's great for cards or containers that need to look sharp but not "stabby."
- 8-12 Pixels: This is the goldilocks zone. It's clearly rounded, looks modern, and works for almost any button or window.
- 20+ Pixels: Now you're getting into the "bubble" or "playful" territory. This is perfect for simulators or games aimed at a younger audience where everything needs to feel soft and bouncy.
The trick is to look at your game's overall art style. If your characters are blocky and low-poly, maybe stay on the lower end of the pixel count. if you have a cartoony, high-vibrancy world, crank those pixels up and let the UI breathe.
Dealing with the "Stroke" Headache
One of the biggest gripes UI designers have on Roblox is how UIStroke interacts with UICorner. In the past, it was a total nightmare to get a border to follow a rounded corner properly. Thankfully, Roblox has improved this, but you still have to be careful.
When you add a UIStroke to an element with a UICorner, the stroke should automatically follow the radius you've set. However, if your roblox uicorner radius pixels are set too high—specifically more than half the height of the object—the stroke might start looking a bit wonky at the edges.
Also, keep in mind that ClipsDescendants can be a bit finicky with rounded corners. If you have an image inside a rounded frame, the image might not actually "clip" to the rounded corners unless you're using some specific tricks or the newer CanvasGroup component.
Mobile Optimization and Screen Resolution
Here's something a lot of people forget: a 10-pixel radius on a 4k monitor looks a lot smaller than a 10-pixel radius on an old iPhone 6. This is the one downside of using fixed pixels for your corners.
While I almost always recommend Offset for consistency, if you're making a game that must look identical on every single screen, you might have to do some math. Some developers use a small script to adjust the roblox uicorner radius pixels based on the player's screen size. It sounds like a lot of work (and it kind of is), but for high-end UI, it's the secret sauce.
A simpler way is to just test your UI in the "Device Emulator" within Roblox Studio. Toggle through the different phones and tablets. If your corners look like tiny pinpricks on a tablet but giant curves on a phone, you might need to find a middle ground.
Scripting Your UICorner
Sometimes you don't want a static radius. Maybe you want a button to "round out" even more when a player hovers over it. You can totally do this with a script!
Since the CornerRadius is a UDim, you can't just change one number; you have to assign a new UDim. It looks something like this:
script.Parent.UICorner.CornerRadius = UDim.new(0, 15)
In this case, the 0 is the scale, and the 15 is the roblox uicorner radius pixels. You could put this inside a TweenService call to make the rounding happen smoothly. Imagine a square button that slowly turns into a circle when you click it—it's a small touch, but it adds a ton of "juice" to your game's feel.
Common Pitfalls to Avoid
I've seen a lot of UI in my time, and there are a few mistakes that keep popping up when people play with corner radiuses:
- Mismatching Corner Styles: Don't mix rounded frames with sharp-edged buttons inside them. It looks messy. If the container is rounded, the contents should usually follow suit.
- Over-rounding Small Objects: If you have a tiny icon, giving it a 10-pixel radius might turn it into a blob. Keep the radius proportional to the object's size.
- Ignoring the "Pill" Shape: If you want a perfectly pill-shaped button (totally round ends), don't just guess the pixel count. Set the Scale to 1 or a very high Offset. However, Offset is safer—just set it to something like 100, and it will always cap out at the maximum possible roundness for that height.
Final Thoughts
At the end of the day, mastering roblox uicorner radius pixels is all about developing an eye for detail. It's one of those things that players won't consciously notice if you do it right, but they'll definitely feel that something is "off" if you do it wrong.
Experiment with different values, always test on multiple devices, and don't be afraid to change things up if a design isn't working. UI design is an iterative process. You might start with 8 pixels, realize it's too sharp, move to 12, and eventually settle on 10. That's just part of the craft! Happy building, and may your edges always be as smooth as your frame rates.