To make a decal in Roblox, start by creating your image. Use image editing software like Paint.net or Photoshop. Make sure the image is less than 1000×1000 pixels to avoid blurring.
Next, upload the decal. Sign in to your Roblox account and go to the Create tab. Head to the Development Items section, click on Decals, and then Upload Asset. Select the image you made, name it, and give it a description. Click Upload to submit it for moderation.
Once approved, your decal will be in your inventory. You can use it in any game by copying the decal ID from the URL. You can also find decals in the Creator Marketplace, which has a library of public domain decals and assets.
For more detailed tutorials and guides, check the official Roblox documentation and various YouTube tutorials. These resources provide step-by-step instructions and tips to enhance your decal-making skills.