What are dynamic keywords in Google Ads?
Dynamic keyword insertion, often shortened to DKI, is a Google Ads feature that automatically updates your ad copy to include the search term a user typed into Google. When someone searches for something that triggers your ad, their exact search term (or a close version of it) is inserted into your ad headline or description in real time.
The result is an ad that appears to exactly match what the searcher was looking for. "We sell {KeyWord:running shoes}" becomes "We sell trail running shoes" or "We sell lightweight running shoes" depending on the query, automatically, without you writing a separate ad for every keyword variation.
Done correctly, dynamic keyword insertion can significantly improve your click-through rate. Google's research consistently shows that ads which closely mirror the search query get higher CTR, because relevance is the most important factor in whether someone clicks an ad.
Done badly, DKI produces embarrassing, confusing, or nonsensical ads. I've seen "We sell plumber north wales urgent emergency" appear as a headline. That's what happens when the feature is set up without proper boundaries.
How dynamic keyword insertion works (the syntax)
To use dynamic keyword insertion in your ad copy, you use this syntax:
{KeyWord:Default Text}
The KeyWord part tells Google to insert the matching keyword from your ad group. The Default Text is what appears if the keyword is too long to fit, or if the insertion fails for any reason.
The capitalisation of "KeyWord" controls the capitalisation of the inserted text. {keyword:default} inserts in all lowercase. {Keyword:Default} capitalises the first word. {KeyWord:Default} capitalises every word. {KEYWORD:DEFAULT} puts everything in uppercase.
For most ads, {KeyWord:Default Text} is the right choice. It produces natural title-case text that reads cleanly in a headline.
Example:
Headline: {KeyWord:Google Ads Management} in North Wales
If the triggering keyword is "google ads agency north wales", the headline becomes: "Google Ads Agency North Wales in North Wales", which is where it starts to look awkward. This is exactly why ad group structure matters so much when using DKI.
When dynamic keyword insertion works well
DKI performs best in tightly themed ad groups. When all the keywords in an ad group are closely related variations of the same intent, DKI produces clean, relevant ads. An ad group containing "google ads consultant", "google ads specialist", "google ads expert", and "google ads professional" will produce sensible insertions because all keywords are short, clean, and contextually appropriate.
It also works well for high keyword volume with varied long-tail terms. If you're selling a product or service where people search using many different specific variations, DKI lets you match each one without writing hundreds of individual ads.
In price-sensitive or highly competitive categories, where users are scanning results quickly and matching their exact query makes them more likely to click, DKI gives you a precision advantage.
When dynamic keyword insertion goes wrong
DKI breaks down in several predictable ways.
Long or awkward keywords will produce absurd or default-text headlines. If your keyword is "best affordable google ads management company for small businesses in north wales", DKI either inserts this verbatim or falls back to your default text. Set character limits to ensure the default fires appropriately.
Mixed-intent ad groups cause problems because DKI will insert informational queries into ads designed to drive purchases. The relevance signal works against you.
Generic or embarrassing terms can appear if broad match or phrase match keywords trigger your ad for generic searches. "Cheap" or "free" appearing in a premium brand's ad is not ideal. Control your match types and negative keywords carefully.
Brand keywords are a specific risk. Don't use DKI in campaigns that could trigger on competitor brand names. Inserting a competitor's brand into your ad copy is a policy violation.
How to set up dynamic keyword insertion correctly
Structure your ad groups tightly before anything else. Each ad group should have a single, clear intent theme. DKI works with structure. It falls apart without it.
Choose your default text carefully. It's what users see when the insertion doesn't fire, so make it a compelling, sensible headline for that ad group, not an awkward fallback.
Test your longest keywords manually. Google Ads headlines allow 30 characters. Your DKI keyword plus any surrounding text needs to fit within that limit.
Use DKI in one headline position, not all of them. If you're running Responsive Search Ads, use DKI in one headline asset and write distinct, non-DKI copy for the others. This gives Google's algorithm options to serve the most relevant combination.
Monitor your search terms report after enabling DKI. Review which terms are actually being inserted into your ads. Add any awkward or irrelevant terms to your negative keyword list.
DKI vs Dynamic Search Ads: what's the difference?
This causes confusion. They're different features.
Dynamic keyword insertion inserts the triggering keyword into ad copy you've written. You write the ad structure; Google fills in the keyword.
Dynamic Search Ads are a different campaign type entirely, where Google generates both the headline and the landing page destination automatically by crawling your website. You don't write the ad copy at all. Google writes it based on your page content.
DSAs can be useful for very large product catalogues, but they give you much less control. I use them selectively and always as a supplement to properly structured keyword campaigns, not as a replacement.
Should you use dynamic keywords?
For most small business Google Ads accounts, yes, selectively. DKI is a useful tool in well-structured ad groups targeting specific, clean keyword variations. For North Wales businesses advertising services across multiple towns, DKI can help ads feel more locally specific without writing individual ads for every location variant.
It's not a substitute for good ad copy. Your description lines, your offer, and your call to action still need to be compelling. DKI improves the headline relevance signal; the rest of the ad still needs to convince someone to click. I covered this hands-on in How I Increased My CTR With Dynamic Keyword Insertion, which shows a real account example.
For the broader principles of ad copy that actually converts, The Art of Writing Captivating Google Ads Copy is worth reading alongside this.
If you'd like help with your Google Ads structure and ad copy, I offer a free account audit for businesses already running campaigns.
