Dynamic keyword insertion uses an eligible keyword from the ad group, not necessarily the exact words the person searched. That distinction matters when you review what can appear in the headline.
Google explains the behavior in its keyword insertion documentation and setup guide, reviewed November 4, 2026.
We inherited an account whose insertion setup included terms that should never have appeared in customer-facing copy. The lesson was to inspect the keyword inventory and rendered ads together, rather than assume the search-term report described the inserted text.
Four checks make that review practical:
- Choose useful default text. The default is the headline's fallback when insertion cannot be used. It must make sense by itself and fit the supported ad limits.
- Review eligible keywords. Read every candidate as ad copy. Separate competitor terms, sensitive language and awkward phrasing before enabling insertion.
- Preview the output. Test short and long keywords, default text, capitalization and the destination. Do not confuse a keyword's eligibility with a reviewed final ad.
- Keep query exclusions separate. Negative keywords help control matching; they do not replace reviewing the keywords eligible for insertion or the platform's ad policies.
The original account retrospective reported a 33% ROAS increase in the month after setup changes. That before-and-after observation does not isolate keyword insertion's effect: it lacks a control, a stated attribution window and the other changes needed for a causal comparison. Use the setup checks; do not treat the percentage as an expected return.
Take the idea further
Review one insertion example