Are you using custom-made tools?
You can always consider rendering them in blender and saving the result as a .PNG! You can upload it as a decal and use rbxassetid:// or set the property inside the tool.
As far as actually getting the images, Blender is probably your best bet for getting a high-quality, detailed result.
An alternative, but more likely to return a less detailed result, was shared by AustnBlox.
I’ll update this if I come across any more methods.
Are you using custom-made tools?
If you’re using Roblox gears, you can just get the image from their page on the site.