Google Ads RSA Guide (2026): 15 Headlines + 4 Descriptions That Convert

A Responsive Search Ad (RSA) is the standard Google Ads search format. You supply up to 15 headlines and 4 descriptions, and Google mixes and matches them in real time for each searcher. Your job is not to write one perfect ad. It is to give Google a strong, varied set of parts to assemble.

The character limits (non-negotiable)

• Headlines: max 30 characters each, counting spaces.
• Descriptions: max 90 characters each, counting spaces.

Google silently rejects or truncates anything over the limit, which is why pasting raw ChatGPT output usually fails. The fastest fix is to generate them in a tool that counts characters as it writes. Our free Google Ads RSA Generator outputs all 15 headlines and 4 descriptions with a live character count on every line.

The 8 headline angles to cover

Variety is what powers Google's testing. Spread your 15 headlines across these angles instead of writing 15 versions of the same idea:

1. Keyword-match — include the exact keyword you bid on (lifts relevance and Quality Score)
2. Primary benefit — the main outcome the buyer wants
3. Key feature — the standout capability
4. Price / offer — free trial, discount, no-contract
5. Social proof — ratings, customer count, awards
6. Urgency — limited time, ends soon, today
7. Question — speaks to the searcher's problem
8. Call to action — get started, book a demo, shop now

Aim for at least 2-3 headlines that contain your target keyword. Relevance between keyword, ad, and landing page is one of the biggest levers on cost per click.

A worked example (keyword: “project management software”)

Notice every line is under 30 characters, each takes a different angle, and the keyword appears naturally. That is the pattern to repeat across all 15.

Descriptions: expand and direct

Your 4 descriptions (90 characters each) carry the body. Lead with a concrete benefit, add a proof point or feature, and end with a clear next step. Avoid filler words like “innovative,” “solutions,” and “cutting-edge” — they burn characters and say nothing.

Pinning: use it sparingly

Pinning forces a specific asset into a fixed position. It is useful for a brand name or a required legal line, but pinning too many assets strips Google of the combinations it needs to optimize, and it usually lowers your Ad Strength. Pin one or two assets at most, then let the system test the rest.

Common mistakes that tank Ad Strength

• Submitting only 3-5 headlines instead of all 15
• Writing 15 near-identical headlines (no angle variety)
• Zero headlines containing the keyword
• Over-pinning every asset
• Lines that exceed the character limit and get truncated mid-word

The shortcut

Writing 15 headlines and 4 descriptions by hand, counting characters for each, takes most advertisers 30-45 minutes per ad group. You can generate the full, limit-safe asset in seconds with the free Google Ads RSA Generator, then edit for your real offer and brand voice. Pair it with the Ad Copy Generator for Facebook and Instagram, and run your finished lines through Rate My Copy to score them before you launch.