plentiBlox is a program which allows you to port over images to Roblox in the form of frames using the C# implementation of Roblox's place format by @CloneTrooper1019 which can be found here. plentiBlox supports lossless, lossy and no compression
Someone had to eventually do it, so here we are now.
Yes you can here
The main purpose of plentiBlox is, as stated, above, creating higher quality images due to Roblox decals having an image size limit. The purpose of plentiBlox is NOT to bypass moderation or in any way break the Roblox Terms of Use or Community Guidelines