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| Search volume shows what people are interested in. Best sellers show what people are actually buying. For smarter merch research, use both—and pay attention when the two signals don’t agree. |
One of the easiest ways to waste time in print-on-demand is to find a keyword with impressive search volume, assume that means people want it on merchandise, and start designing.
The opposite mistake is just as common. You browse a marketplace, see several products selling well, and decide you’ve found a proven niche—without knowing whether those products represent current demand, years of accumulated sales, unusually strong sellers, or simply the handful of designs that survived in an overcrowded category.
Both signals are useful. Neither tells the whole story.
When I’m researching ideas for Public Nuisance Apparel, I’m increasingly interested in what happens when the two disagree. A topic can look huge in keyword research and surprisingly weak on actual merchandise. Another can have fairly ordinary search numbers but a marketplace full of products customers are clearly willing to buy.
That disagreement is often where the useful research begins.
Search volume tells you people are interested. It doesn't tell you they'll buy merch.
Search volume is attractive because it gives us a number.
A keyword gets 10,000 searches. Another gets 2,000. The first one must be the better opportunity, right?
Not necessarily.
Even Google describes Keyword Planner's monthly-search figures as estimates, and its historical metric is generally an average based on the selected period, location, and network settings. Google Trends works differently again: its scores are normalized relative-interest figures from a sample of searches, not raw monthly search counts. (Google Help)
More importantly for merch sellers, neither measurement automatically tells us why someone searched.
Someone searching for “mahjong” could be looking for rules, an app, a local club, replacement tiles, a strategy guide, or information about the game.
Someone searching for “mahjong tote bag” is considerably closer to the kind of shopper we care about.
That difference between topic interest and commercial merch intent matters enormously.
A huge general-interest keyword can produce terrible merchandise ideas. A much smaller phrase tied to an identity, hobby, event, joke, aesthetic, or gift-buying situation can be far more valuable.
This is why I don't automatically reject a merch idea just because the keyword tool isn't lighting up.
Best sellers answer a different question
Best-selling products move us closer to the thing we actually care about: somebody bought something.
That's a stronger behavioral signal than somebody typing words into a search box.
If you're researching a tennis niche and you repeatedly find tennis sweatshirts, hats, mugs, totes, and gifts selling across marketplaces, you've learned something search volume alone can't tell you. People aren't simply interested in tennis. Some of them are expressing that interest through products.
For merch research, that's powerful.
But bestseller research has its own trap: we usually don't know the complete story behind the product we're looking at.
A successful listing may have been around for years. The seller may already have an audience. The product may rank because of a long sales history. It may have been promoted externally. It may be unusually customizable. Or the seller may simply have executed the concept much better than everyone who copied it afterward.
Seeing one successful product doesn't mean making the 437th version of it is a good business decision.
That's the mistake I think a lot of merch research encourages: proof of demand gets confused with permission to copy the demand.
Those aren't the same thing.
If I had to choose one signal, I'd start closer to the sale
For print-on-demand specifically, I generally put more weight on evidence of actual product buying than on raw search volume.
Not because search volume is useless. It's because selling merchandise requires more than interest.
People need to want the idea enough to wear it, carry it, display it, give it to somebody, or personalize it.
That's a much higher bar.
If I discover a subject with modest search volume but see several distinctly different products selling around it, I'm interested.
If I find enormous search interest but almost no compelling merchandise activity, I'm more cautious.
But I'm also not looking for a marketplace filled with hundreds of nearly identical best sellers. At some point, “proven demand” starts turning into proven competition.
The sweet spot is usually more complicated: visible buying behavior, enough interest to sustain it, and still some room to bring a different angle.
Bestseller research is most useful when you study patterns, not products
Instead of finding one popular shirt and asking, “How can I make something like this?”, I'd rather look across a category and ask what buyers seem to respond to.
Maybe humorous designs consistently outperform literal hobby graphics.
Maybe the products skew retro rather than minimalist.
Maybe personalized versions appear repeatedly.
Maybe most of the strong designs revolve around belonging—club names, occupations, family roles, inside jokes—rather than the hobby itself.
Maybe tote bags are everywhere while phone cases barely appear.
That's much more actionable.
You're not copying an individual product. You're trying to understand the shape of the demand.
That distinction matters for what we're building with Public Nuisance Apparel. A Mahjong design, for example, doesn't have to compete by looking like every other Mahjong design. The underlying market can be validated while the visual execution goes somewhere more distinctive.
That's exactly why I like pairing marketplace research with actual design experimentation.
Search volume becomes more useful once the idea survives the marketplace test
This is where keyword research earns its place.
Once I've found evidence that people buy products around an idea, search data can help answer better questions.
What terminology do people actually use?
Is one version of the phrase gaining interest while another is fading?
Do people search “mahjong,” “mah jongg,” or both?
Is the topic seasonal?
Are people more interested in the activity itself, a particular aesthetic around it, or gift-oriented searches?
Google Trends can be particularly useful for comparing wording and seeing relative changes over time, but Google itself cautions that Trends represents normalized search interest rather than an absolute popularity score. (Google Help)
That makes it a research tool, not an oracle.
Use it to sharpen an idea you've already started understanding—not to outsource the entire decision.
Marketplace search and Google search aren't interchangeable
This is another detail that's easy to miss.
A person searching Google and a person searching inside Zazzle are not necessarily doing the same thing.
The Zazzle shopper is already on a product marketplace. Their search is naturally closer to commercial intent.
Google search covers everything.
Zazzle itself distinguishes traffic coming from Zazzle Search from traffic coming through Google and other channels in its creator metrics. (Zazzle)
That's one reason I wouldn't base a Zazzle strategy entirely on an external keyword tool.
External search can help us understand language and broader interest. Marketplace behavior helps us understand what shoppers are doing in the environment where we're actually trying to sell something.
You want both views.
Zazzle's own advice points in the same direction
Zazzle's current creator guidance recommends researching descriptive terms people might actually use to find a design. It specifically mentions tools such as Google Trends and Google Search, while also warning creators against irrelevant tags and keyword stuffing. Zazzle currently allows up to ten tags, and it recommends using specific, relevant phrases rather than filling every available field with variations of the same words. (Zazzle)
That last part is worth paying attention to.
Good merch research isn't about finding the biggest possible pile of keywords.
It's about understanding the customer well enough to describe the thing accurately.
The Zazzle Creator Hub also now groups creator resources with current trend guides, product launches, best practices, and other selling material, which makes it useful as another source of marketplace context rather than relying entirely on generic POD advice. (Zazzle)
The research method I'm using for Public Nuisance Apparel
I'm starting to think about merch ideas in three layers.
First comes buyer evidence. Can I find signs that people already buy products connected to this subject, identity, aesthetic, joke, event, or hobby?
Then comes search evidence. Are people actively looking for the concept, and what language are they using?
Finally comes the part that's harder to put into a keyword tool: Can we make something noticeably better or different?
That third question can kill an otherwise impressive niche.
If the only idea I can come up with is essentially the same slogan, composition, typography, and product everybody else already has, I don't care how attractive the search volume looks.
On the other hand, if there's proven buying behavior and I can immediately see an underserved aesthetic or angle, relatively modest search numbers don't bother me nearly as much.
That's the distinction between chasing keywords and actually developing merchandise.
So which should you trust?
Trust best sellers to tell you that people buy.
Trust search data to tell you what people are interested in and how they're looking for it.
Then trust neither of them enough to design blindly.
The strongest merch research happens when several clues begin pointing in the same direction: people are interested, people are buying, the language is understandable, the competition isn't impossible, and you can still bring something recognizably different to the marketplace.
And when search volume and bestseller data disagree?
Don't automatically throw the idea away.
That's usually when I want to investigate it more.
Because the interesting question isn't really, “Which number is right?”
It's why are these two signals telling me different things?
Sometimes the answer is exactly where the merch opportunity is hiding.
