Say this
"An even short buzz, a 2 or 3 all over, with a clean squared-off lineup and just a slight taper at the temples."

Men's haircut preview
Usually yes — a square face is one of the best matches for a buzz cut. The strong jaw and straight hairline that come with a square face are exactly what a short, clean cut shows off. The trick is not over-softening it. Here's the version to ask for, and how to see it first.
Before
AfterThe version that works
Where it goes wrong
What to ask your barber
"An even short buzz, a 2 or 3 all over, with a clean squared-off lineup and just a slight taper at the temples."
A preview is a direction for the barber, not a guarantee — but it beats pointing at a stranger with different hair.
A bad fade is £25 and three weeks growing it out. A preview is about a quid.
See a buzz cut on my faceRead first
Same cut, other faces & hair
Same square face, other cuts
Related checks