Why Your Textures Look Like Pixelated Garbage
Most people trying to make custom textures for Roblox run into the same wall: they create a perfectly good image in Photoshop or Blender, drop it into their project, and immediately get angry when it looks stretched, tiled weirdly, or just refuses to show up at all. It's not that Roblox can't handle textures. It's that the workflow is mildly broken if you don't know which knobs actually do anything. Open Roblox Studio and pick the part you want to texture. In the Properties window, look for Material. If it's set to Plastic or SmoothPlastic, you can apply a Decal or a Texture directly. That's the basic path. But here's what nobody tells you: switching a part's Material to Custom lets you use a Texture instead of a Decal, and a Texture covers every face equally while a Decal only covers one side and tiles differently depending on the face dimensions. Most beginners waste twenty minutes moving decals around before realizing Custom Material with a Texture property is the better option for anything symmetrical. To actually get the image in there, you have three real options. First, upload your image to the Roblox website through Settings then Upload, grab the Asset ID, and paste it into the Texture property as roblox.com/asset?id=YOUR_ID. Second, drag and drop an image file directly onto the part in the 3D viewport and Studio will auto-create a decal on it. Third, use a plugin from the Toolbox if you're doing repeated texture passes across many parts.
The auto-import path is faster but it gives you zero control over how the image is compressed. Roblox runs everything through its own lossy compression pipeline regardless, and I've seen high-contrast text textures turn into unusable blobs after import even though they looked fine in my editor. The workaround is to avoid using text or thin lines in your source image entirely. Use solid color blocking or very thick strokes if you need readable details, and bake your textures at 512x512 or 1024x1024. Anything smaller than 256 shows blocky pixelation on medium-sized parts. Anything larger than 1024 is usually a waste because Roblox resizes it down and compresses it anyway.
UV Mapping Is Where Everything Falls Apart
This is the part that costs most people hours. If you're trying to apply a single texture to a non-rectangular or oddly proportioned part, it will stretch because Roblox calculates UVs automatically based on face bounding boxes. There's no per-face UV editor built into Studio the way there is in Blender or Maya. If you've ever tried to put a floor tile texture on a slab and had the grout lines stretch to twice their normal width, you've hit this exact problem. The practical fix is to make your part to a size where the texture proportions work naturally. If your texture is a 1x1 meter brick pattern and your part is 4x2 meters, you now know the texture will tile once horizontally and twice vertically. Set the Texture's Tile property to true if it isn't already, then adjust the OffsetST and ScaleST values directly in the Properties window to control how the texture maps. ScaleSTX and ScaleSTY are your tiling controls. A value of 2 means the texture repeats twice across that axis. A value of 0.5 means it stretches once across the whole face. This takes about thirty seconds to figure out instead of the hour I spent trying to rescale my part geometry instead of the UV coordinates.
Get the Full Details
Normal Maps and Advanced Materials
Roblox supports normal maps through the BumpMap property, but it uses a slightly different workflow than standard engines. You need a separate image for the bump map and you apply it through the Material settings, not through the Texture property. Also, Roblox normal maps are RGB-encoded, not RGBA, and they expect the blue channel to carry the Z-depth information. If your normal map looks inverted or weirdly flat, check that your export settings didn't flip the green channel. Substance Painter and Blender both have toggle switches for this exact thing. For physically based rendering effects, switch your part to the MeshPart class and use a Material preset like Metal, Glass, or Neonglow rather than trying to fake those looks with custom textures. The built-in materials have baked-in specular and roughness calculations that custom textures can't replicate no matter how detailed the image is. I learned this the hard way when I spent two days painting a metallic texture by hand only to realize the part wasn't reflecting anything because the underlying material was still set to Plastic.
Performance Reality Check
Every unique texture you add to a part increases the draw call count for that mesh. If you're building an open world with thousands of textured props, you'll tank mobile frame rates within an hour of playtesting. The industry standard workaround is texture atlasing: combine many small textures into one large sheet and use ScaleST to crop and tile sections of it on individual parts. This reduces draw calls significantly because the GPU can batch more geometry together when textures are shared. Another practical limit is that Roblox has a maximum texture resolution cap that varies by platform. Mobile devices top out at lower resolutions before memory issues appear. I've seen games that looked fine on PC completely break on iPhone 12 and below because the texture memory exceeded what the device could allocate for a single scene. The safe range is keeping all your custom textures at 512 or under for mobile-first projects, and 1024 max for desktop-targeted builds. If you need truly high-resolution detail, consider using decals placed strategically on specific faces rather than wrapping full textures around entire parts. Decals are lighter weight than MeshPart textures in most cases because they render as overlay planes rather than full UV-mapped surfaces. This also sidesteps the UV stretching problem entirely since you can place decals only where the geometry is flat and proportionate.
