Writing to Ad-Copy Character Limits

Marketers treat ad character limits like a cage — a frustrating box that won’t hold their brilliant message. That’s backwards. The 30-character headline is one of the best editors you’ll ever work with, because it refuses to let you hide a fuzzy value proposition behind extra words. For more on query control, see our approach to negative keywords.

Learn the limits, then use them as a discipline rather than an obstacle.

The limits that matter

Know them cold so you write to fit from the first draft, not after. To understand the underlying data infrastructure, review our guide on server-side tagging.

• Headlines: ~30 characters each — the workhorses, where the offer must land.
• Descriptions: ~90 characters each — room for one supporting idea, not a paragraph.
• Sitelink descriptions: ~270 characters total across two lines — context, not an essay.
• The rule of thumb: one idea per asset, expressed as tightly as possible.

Why the constraint improves the copy

A 30-character limit is unforgiving to vagueness. “Solutions to transform your business” doesn’t fit and doesn’t mean anything; “Payroll for restaurants” fits and says exactly what you do. The constraint strips out the filler adjectives and forces the specific, concrete claim underneath — which is the claim that actually converts.

How to write to it

Start from the plainest statement of what you offer and who it’s for, then cut until it fits. Lead each headline with a distinct idea — offer, proof, differentiator — rather than repeating the same claim three ways. And write the description to support the headline with one concrete detail, not to restate it. If a line won’t fit, that’s usually a sign the idea isn’t distilled yet.

Does your value prop survive the cut?

Take your core message and try to write it as a 30-character headline. If you can’t without losing the meaning, the problem isn’t the limit — it’s that the message hasn’t been sharpened enough. Fix that, and clearer copy follows everywhere else too.