Google Ads Character Limit: 30 Characters Is Barely One Idea

A Google Ads headline holds 30 characters — confirmed directly by Google's own Ads Help documentation, and consistently described across the industry as the tightest single constraint anywhere on the platform. Thirty characters is enough for one idea: a benefit, a number, a hook. Not three.

Why 30 Characters Forces a Choice

Google displays 2-3 headlines at a time out of up to 15 provided ones, mixing and matching them algorithmically for each search — which means every individual headline has to work both alone and next to any other headline in the list, in any order. A headline trying to pack in a feature, a price, and a call to action inside 30 characters usually ends up communicating none of them clearly; the constraint pushes toward one focused message per headline rather than a compressed summary of everything.

The Real Cost of Writing Too Few

Google explicitly recommends providing all 15 headlines and all 4 descriptions, and running with fewer has a direct, measurable consequence: Google's own Ad Strength indicator drops from "Excellent" toward "Average" or "Poor" as the count falls short, and a lower Ad Strength score correlates with reduced impression volume — the ad simply gets shown less. This isn't a soft suggestion buried in best-practice advice; it's a mechanic Google's own interface actively penalizes for.

Thirty characters feels punishing until the alternative is considered — an ad that tries to say everything in one headline usually says nothing memorably. The constraint isn't an obstacle to good ad copy; for headlines specifically, it's closer to the actual definition of it.

The Counting Trap: Double-Width Characters

Google's own documentation confirms that in double-width languages — Korean, Japanese, and Chinese — every character counts as 2 toward the limit rather than 1, meaning a headline that looks like it comfortably fits under 30 characters in one of those languages may actually be using 40 or more of the available budget. This mirrors a pattern seen elsewhere — SMS's Unicode encoding switch, emoji counting as multiple characters on the App Store — where the visible character count and the count the platform actually enforces aren't the same number.

Descriptions: More Room, Same Discipline

Descriptions get 90 characters each, with up to 4 provided and 1-2 shown per ad — considerably more room than a headline, but Google may show only the first description or truncate on mobile, so the strongest point still needs to land within roughly the first 60 characters rather than relying on the full 90 being read. A description built around one specific benefit plus a clear call to action tends to use that space more effectively than one trying to list several features in sequence.

Shopping Titles: A Different Field, a Similar Trap

Shopping ad titles technically allow up to 150 characters, pulled from a Merchant Center product feed rather than typed directly into the ad — but only the first roughly 70 characters reliably display in standard search placements. Front-loading the brand, product type, and the specific attribute buyers actually search for within that first 70 characters matters considerably more than using the full 150-character allowance, since details placed after that point may never be seen at all.

Checking Copy Against the Right Field

Since headlines, descriptions, paths, and Shopping titles all carry different limits — and some of those limits count differently depending on language or truncation behavior — checking a draft against the exact field it's headed for, rather than a general sense of "short enough," avoids submitting copy that gets silently cut or never displays in full. A character counter makes checking any individual headline or description exact and immediate.

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Google Ads' 30-character headline is the tightest space on the platform, and Google's own Ad Strength mechanic makes clear that using fewer than the recommended 15 has a real, measurable cost in how often an ad actually runs. Writing for that constraint — one idea per headline, checked against the exact character count rather than a rough estimate — is what separates copy that clears the limit from copy that's actually built for it.