Google Ads in Asia vs Europe: field notes from Tokyo and Seoul

I’ve spent eight years running paid campaigns out of Brussels, mostly Google Ads, mostly for European clients - B2B SaaS, e-commerce, growing service businesses across the UK, Belgium, France, the Netherlands and the US.

By year five I had a confident mental model: what good performance looked like, what a healthy account structure looked like, how to think about the channel mix.

Then I spent two months in Korea and Japan, as a traveller rather than a media buyer. I didn’t run a single campaign while I was there. What I did was pay attention: how people actually shop, discover brands and talk to businesses on their phones; which platforms the local marketing press writes about; what the published industry data says. Most of my European channel-mix assumptions didn’t survive the trip.

Not because the underlying principles were wrong - they weren’t. But because the channels, platforms and consumer behaviour underneath were so different that “Google Ads first” was the wrong starting point for almost every Asia-entry brief I’d now take from a European client.

What follows mixes three things: direct observation from the trip, numbers from published sources (linked wherever I can), and professional judgement I’m willing to defend without having tested it in-market. I’ll flag which is which.

Quick version

• Search is not one market. Korea is Naver-dominant. Japan splits between Google and Yahoo Japan. Europe is essentially Google.
• Google Ads alone is insufficient for Korea. Kakao and Naver own ecosystems Google can’t touch.
• Mobile-first isn’t a slogan in Asia. It’s a constraint.
• Performance benchmarks don’t transfer cleanly. CPC, CTR and CVR often swing by multiples between markets in the same vertical.
• Privacy regimes differ more than people assume.
• Some European paid practice is genuinely better: measurement discipline, copy restraint, cross-border craft.

Search isn’t one market

The first thing that breaks a European mental model is the search-engine map.

In Belgium, France, Germany or the UK, Google holds roughly 95% of the search market. Bing exists but is mostly invisible to a B2C campaign. Strategy starts with Google Ads, and the only real question is how to slice the budget across Search, Performance Max, Demand Gen and YouTube.

In Korea, Naver still owns roughly 60-63% of search by query volume in 2025. Google is around 30%. Bing and Daum each sit near 3%. A Korea launch with a Google-Ads-only budget cuts you off from more than half the search demand on day one.

The fix isn’t subtle: you need a Naver Search Ads account, and you need someone who can write Korean ad copy that gets approved through Naver’s review process, which is stricter and less automated than Google’s.

Japan is different again. Google is roughly 76-77% on desktop and around 90% on mobile. Yahoo Japan sits around 6-8%, down from roughly 15% a few years ago. Bing has climbed into the 20-30% range on desktop, partly because of Edge and Copilot defaults. The 2010 Google-Yahoo Japan agreement still stands: Yahoo Japan runs on Google’s search backend but reranks results toward its own ecosystem. For most Japanese B2C campaigns, the sensible split is Google Ads plus LINE Yahoo Ads (the rebranded former Yahoo! JAPAN Ads).

The takeaway: in Asia, the search budget is a portfolio, not a channel.

The platforms Google Ads can’t reach

The bigger gap isn’t in search. It’s in the messaging and marketplace platforms that have quietly become discovery and conversion channels.

KakaoTalk reaches roughly 96% of Korean smartphone users, with 48.9 million MAU in 2025. It’s the WhatsApp, Slack, payments, ride-share and delivery app of Korea, except more deeply integrated than any of them. Ads run through Kakao Moment. There is no Google equivalent for this audience.

LINE is the Japanese analogue. It crossed 100 million MAU in Japan in early 2026. LINE Ads is now part of LINE Yahoo Ads following the April 2026 merger under LY Corporation, and offers timeline and message-based inventory. For B2C launches in Japan, ignoring LINE Ads is roughly like ignoring Meta in Europe.

Then there are the marketplaces. Coupang is Korea’s largest e-commerce platform, holding around 40% market share in 2025, operationally closest to Amazon, with first-party logistics and Rocket Delivery for same-day fulfilment. Naver SmartStore is second at roughly 22-25% (directional figure, worth re-checking against the latest reports), closer in shape to Shopify embedded in Naver Search.

Arriving in Korea with the European Google Ads plus Meta plus Shopify playbook makes you invisible to half the market. The playbook I’d actually recommend leads with Naver Search Ads, listings on Coupang and Naver SmartStore, and Kakao Moment, with Google Ads playing a supporting role.

Mobile-first as a hard constraint

The Belgian and Dutch e-commerce clients I work with still see 30-40% of revenue from desktop. UK numbers are similar.

That assumption breaks immediately in Korea. Around 73-75% of Korean e-commerce transactions happen on smartphones, roughly three in four, compared to about 57-58% in Belgium.

Korean consumers don’t just buy on mobile. They decide, compare, talk to support and re-engage on mobile.

What this changes in practice:

• Vertical video creative is the default, not a 9:16 afterthought.
• Page-speed budget tightens. A Korean landing page that takes 4 seconds to first contentful paint is a failed launch.
• Tap-target design becomes load-bearing.
• Form-length sensitivity is severe. A 5-field lead form that’s normal for a Belgian B2B SaaS is a major drop-off in Korea.

Ad copy and landing-page conventions

A typical European e-commerce landing page in 2026 is short, calm, image-led, with one strong CTA above the fold.

A typical Japanese landing page for the same product is five to ten times longer. Dense. Information-rich. Customer testimonials. Awards. “As seen in” press. Ingredient lists. Manufacturing stories. Founder explanations. FAQ stacks. More testimonials.

The Western reaction tends to be “this is overwhelming.” The Japanese reaction tends to be “I trust this enough to buy.” (Observation, from reading dozens of Japanese e-commerce pages during the trip and comparing them to their European equivalents.)

Korean landing-page conventions are similar in density but lean on a different signal: social proof through creators and influencers. Pages that don’t show creator content, comparisons with named alternatives and explicit credentialing tend to underperform the ones that do.

“Fixing” an Asian landing page with European minimalism is a known way to halve conversion rates. (Hypothesis, well-supported by what local marketers say in print - I would not test it with a client budget just to confirm.)

Performance benchmarks don’t transfer

This is the section where European marketers consistently miscalibrate.

Published Korean and Japanese benchmarks regularly land far from European ones in the same vertical. From industry reports and what local marketers write up, the directional pattern is clear:

• Korean B2C quick-commerce categories tend to see materially higher CVRs than their European equivalents.
• Naver Search Ads CPCs often sit below Google Ads Belgium in comparable categories.
• Japanese B2B display CTRs tend to run above European norms for the same type of product.

Caveat: these are directional observations from published and anecdotal sources, not figures drawn from accounts I’ve personally run. Any team setting Asian targets should rebuild its benchmarks on its own first-party data.

The practical implication: never set Asian campaign targets using European numbers. Set provisional targets, then reset after two to three weeks of actual data.

Privacy regulation: similar shape, different teeth

This is the section where European marketers usually relax and then get bitten.

GDPR is strict on consent UX, lawful basis, data subject rights and cross-border transfer.

South Korea’s PIPA is widely considered one of Asia’s strictest privacy regimes, and on some axes stricter than GDPR. The online real-name verification system was struck down in 2012; today’s apps use carrier-based mobile verification instead.

Japan’s APPI is the lightest of the three. Consent banners are common but not universal. Cross-border transfer rules are more flexible.

A GDPR-compliant stack is not automatically PIPA-compliant. A Japanese campaign launch doesn’t need the same consent infrastructure as a European one.

What I’d recommend for a Brussels client entering Korea

This is hypothesis, not case study. If a European client briefed me on a Korea launch tomorrow, the order I’d argue for:

• Don’t lead with Google Ads. Lead with Naver Search Ads.
• List on both Coupang and Naver SmartStore.
• Hire a Korean copywriter, not a translator. Translating ad copy is the most common Asia-entry mistake I see from European teams.
• Build the landing page mobile-first and full-density, three to five times longer than the European equivalent.
• Allocate a meaningful share of the budget to Kakao Moment retargeting.
• Add KakaoPay and Naver Pay as default checkout options.
• Budget for influencer-driven content from week one.
• Set provisional performance targets, not Belgian benchmarks.
• Use Google Ads for brand defence and incremental search, not for the bulk of the budget.

For Japan, the shape is closer to Europe (Google Ads-led), but with LINE Yahoo Ads as a serious second channel.

What Asian brands could learn from European paid practice

• Tighter attribution and measurement. European campaigns tend to be more honest about view-through limits.
• Cross-border discipline. European agencies are used to running multilingual, multi-country campaigns with nuance.
• Privacy-by-design as positioning. European brands that lead with privacy increasingly have a competitive edge.
• Restraint in promotional language. The understated European tone wears better across repeat exposure.

What stayed the same

For all the differences, the underlying principles I rely on in European accounts still show up everywhere:

• Account structure matters.
• Creative testing pace beats creative perfectionism in every market.
• The first thing to fix is almost always tracking.
• If the product doesn’t fit the market, no channel mix saves you.
• “Spend more” without an attribution model is the same anti-pattern in Seoul, Tokyo and Brussels.

Practical thoughts

• If you’re a European marketer planning Asia entry: budget for a local agency partnership in the first six months.
• If you’re an Asian brand entering Europe: hire a European specialist who understands GDPR as design, not paperwork.
• If you’re a freelancer or small agency: spending a few weeks working from Seoul (with the late-night infrastructure I wrote about here) gives you a permanent perspective shift, even if your clients are still back home.
• If a vendor proposes a Korea launch with “Google Ads plus Meta plus Shopify”, push back. The proposal is missing the half of the Korean market that lives on Naver, Kakao and Coupang.

FAQ

Does Google Ads work at all in Korea?

Yes. Google holds around 30% of Korean search and is dominant on YouTube. It’s a real channel and worth running. It just isn’t the dominant channel the way it is in Europe.

What’s the Naver equivalent of Google Search Ads?

Naver Search Ads is the platform; the keyword-auction product specifically is called Power Link (파워링크). Bidding starts very low. The interface is stricter than Google’s.

Roughly what’s the budget floor for testing the Korean market seriously?

My rough estimate: for a meaningful B2C test covering Naver Search Ads, Kakao Moment retargeting and limited influencer content, plan for €15-25K over the first eight weeks, plus local creative production. Below that and you’ll get noise rather than signal. (Educated guess, not a figure drawn from accounts I’ve run.)

Closing thoughts

The eight years of Google Ads experience I had going into this trip didn’t go to waste. The principles, the discipline and the attribution thinking all still carry over.

What doesn’t transfer is the channel map. And in paid acquisition, the channel map is half the work.

For European marketers, the lesson is humility about the limits of “Google Ads plus Meta” thinking. For European clients considering Asia: budget for partnership and rewrite, not translation. For Asian brands entering Europe: GDPR is a design constraint, not a checkbox.

Two months watching how Japan and Korea actually do digital marketing made me a better marketer for European clients too. The questions get sharper when you’ve seen a market where your default assumptions don’t apply.