Headline analyzer
What is the Google RSA 30-character headline limit?
A Google Responsive Search Ad (RSA) accepts 3 to 15 headline assets, and each headline is capped at exactly 30 characters — 15 in double-width languages like Japanese, Korean, or Chinese, where each character counts as two. Descriptions allow 90 characters. This is a hard fit constraint, not a quality curve: a headline over 30 characters is rejected at upload, so the limit is a wall you write up to, not a preference you can push past.
Seeklyn enforces the exact 30-character RSA cap in the Google Ads channel of the Headline Studio — the counter turns hard-stop red at character 31 rather than just nudging you, because Google would reject it outright.
What are the Google RSA character limits?
Google Responsive Search Ads let you supply 3 to 15 headline assets and up to 4 descriptions; Google then mixes and matches them at serve time. Each headline field supports up to exactly 30 characters, and each description up to 90. In double-width languages — Japanese, Korean, Chinese — every character counts as two, so a 30-character field effectively holds 15 characters. Path fields (the display-URL segments) are capped at 15 characters each.
The critical distinction from an organic title is that 30 is a hard limit, not a soft target. YouTube will happily store a 90-character title and merely truncate it; Google Ads will reject a 31-character headline at upload and refuse to save the ad. So the discipline is different: you are not optimizing a length curve, you are fitting a complete, compelling message into a fixed box, then doing it again 14 more times with distinct angles so Google has raw material to test.
| RSA field | Character limit | Count / notes |
|---|---|---|
| Headline (each) | 30 | 15 in double-width languages |
| Number of headlines | 3–15 assets | Google combines them at serve time |
| Description (each) | 90 | Up to 4 descriptions |
| Display path (each) | 15 | Two optional path fields |
How do you write within the 30-character cap?
Because every headline must be self-contained (Google can show any of them, in any order, and pin only sparingly), each one has to earn its place inside 30 characters. Favor concrete nouns and a single benefit or offer per headline, drop filler words, and use numerals over spelled-out numbers to save characters. Supply a spread of distinct angles — benefit, feature, offer, CTA — rather than 15 rewordings of the same line, so the system has genuinely different material to optimize across.
Sources & evidence
- Google Ads Help — About responsive search ads — Headlines up to 30 characters (double-width counts as 2), descriptions 90, up to 15 headlines.
- Google Ads Help — Performance Max text assets — Confirms the 30-character headline cap (with at least one ≤15 chars) across Google ad surfaces.
Frequently asked questions
How many characters can a Google Ads headline be?
Exactly 30 characters per headline in a Responsive Search Ad — 15 in double-width languages like Japanese or Chinese. Descriptions allow 90. A headline over 30 characters is rejected at upload.
How many headlines does an RSA need?
A Responsive Search Ad accepts 3 to 15 headline assets. Supplying a full, varied set of distinct angles gives Google more combinations to test and generally improves ad strength.