Ad preview tool

A generic ad preview checked against the tightest common limits — 30 characters of headline and 90 of body — so creative that fits here fits almost anywhere.

Ad platforms differ enough that writing to each separately is a real cost, and the tightest limits belong to Google search ads at 30 and 90. Copy that survives those will fit Meta, LinkedIn and most display networks without a rewrite, which is why writing to the floor is worth doing even for a campaign that will not run on Google. The corollary is that thirty characters is a severe constraint and most of the work is subtraction: name the thing, name the benefit, stop. Anything that reads as a slogan rather than a statement is usually the part to cut.