Do you lock your tools up? What do you use?

Not a lot of crime in my neighborhood so I don’t lock them up they are in a closed shop and we have a couple large dogs in the yard that go nuts if somebody walks down the street.

Edited to add I have a tool cart that I keep tools in that is similar but for storage not deter theft. Also you could by an engraving tool and mark in your initials that way you can get them back from the local pawn shops they will likely sell them to.

I'd get a Knaack or Rigid jobsite box or cabinet. Regular little toolboxes like that are virtually zero protection against even a small prying attack. Look around at pawnshops and local ad listings, worth spending a few hundred more for something solid. Also, no high-end padlock will say Masterlock on it unless a locksmith has put a better cylinder in it. Look at Abus and others that offer high security lock cores and shackles.

I keep my harbor freight 5 bit screwdriver in my night stand right behind my pistol.
You can never be too safe.

There are two types of physical security.

The kind designed to deter a break in and if that fails to keep the casual thief from grabbing your stuff in a minute or two. This can be accomplished with good lighting, a dog and basic locks on a metal cabinet. Basically what other people in this thread posted. This is cheap and easy.

The other type is deterring a professional thief or an amateur who has an extended period and some tools to break in. This involves legitimate safes, monitored alarm and camera systems, etc. This is hard to design and expensive to install and maintain. You can often end up spending more on the security than what you are trying to protect is worth.

Go with option 1.

Also, cameras seem to be all the rage right now. People seem to forget that cameras don't stop anything. They just give you a view of it after the fact. Yes, it may help in getting the crook arrested but it won't get your stuff back.