We recently ran a series of A/B tests across multiple Google Ads campaigns to understand whether headline capitalisation impacts performance.
It is a small detail, but one that comes up regularly.
Should headlines use Title Case (Every Word Capitalised) or sentence case (written like a normal sentence)?
Both formats appear frequently across Google Ads, LinkedIn, Meta and display campaigns. Some brands apply strict style rules, while others do not consider it at all.
Across the campaigns we tested, the pattern was consistent.
Sentence case headlines generated between 2% and 5% higher click-through rates on average compared with title case.
The difference is not dramatic, but it appeared consistently enough across campaigns to be worth noting.
What we tested
The structure of the tests was straightforward.
We ran paired headlines where the message was identical and the only variable was capitalisation.
Example
Title Case
Grow Your Business With Data-Driven Marketing
Sentence case
Grow your business with data-driven marketing
This allowed us to isolate the impact of formatting rather than message or offer.
What we observed
Across most campaigns, sentence case generated marginally higher engagement.
There are a few likely reasons.
It reads more naturally
Sentence case mirrors how people normally read and write. In search results it tends to feel closer to editorial content than advertising.
It scans more easily on mobile
Most search impressions occur on mobile devices. Sentence case creates clearer word shapes and improves readability when scanning quickly.
It looks less like traditional advertising
Users have become highly adept at filtering promotional language. Sentence case reduces the visual cues that signal a headline is an ad.
Where Title Case can still work
Despite these results, Title Case is not necessarily wrong. There are situations where it can still be effective.
Very short headlines
Short display or banner headlines sometimes benefit from stronger visual hierarchy.
Brand or product names
Capitalisation can reinforce defined products, frameworks or brand assets.
Highly formal sectors
Some industries such as legal or financial services still respond well to more structured formatting.
Platform differences
Formatting preferences also vary slightly by platform.
Google Ads
Sentence case tends to perform better because it mirrors natural language in search results.
LinkedIn and Meta
Sentence case usually integrates better with feed-style content.
Display banners
Title Case can still be effective where visual impact matters more than reading flow.
The bigger takeaway
Capitalisation rarely determines campaign success.
Much larger performance drivers include
• Relevance to the search intent
• Clarity of the problem being solved
• Strength of the benefit or offer
• Audience targeting
• Landing page experience
For example
Generic headline
Marketing Solutions For Growing Businesses
Stronger headline
Double your qualified leads without increasing ad spend
The second will outperform the first regardless of capitalisation.
Our recommendation
Based on testing across campaigns, sentence case is the safer default for Google Ads headlines.
It reads more naturally and aligns better with how users process information in search results.
However, the formatting itself is a minor optimisation.
The biggest gains almost always come from improving the message, relevance and offer rather than the capitalisation of the headline.
Written: 13th March 2026
Updated: 17th March 2026
About the Author: Jordana Clarke
