Running Google Ads in Asia vs Europe - what I learned 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. I knew what good performance looked like, what a healthy account structure looked like, what the channel mix should be.

Two months watching how Korea and Japan actually buy and sell online dismantled most of it.

Not because the 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 I would now recommend.

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. CPC, CTR, CVR swing 5-10x 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 your European mental model is the search-engine map.

In Belgium, France, Germany or the UK, Google is 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%. If you launch in Korea with a Google-Ads-only budget, you’ve cut yourself 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 ~90% on mobile. Yahoo Japan sits around 6-8% (down from ~15% a few years ago). Bing has surged into the 20-30% range, partly because of Edge and Copilot defaults. The 2010 Google-Yahoo Japan agreement is still in place: Yahoo Japan runs on Google’s search backend but reranks results toward its own ecosystem. For most Japanese B2C campaigns you split between Google Ads and LINE Yahoo Ads (the rebranded former Yahoo! JAPAN Ads).

The lesson: in Asia, the search budget is a portfolio. Not one 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 become discovery and conversion channels.

KakaoTalk reaches roughly 96% of Korean smartphone users - 48.9 million MAU in 2025. It’s the WhatsApp + Slack + payments + ride-share + delivery app of Korea, except more deeply integrated. 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 (now part of LINE Yahoo Ads since the April 2026 merger under LY Corporation) offers timeline and message-based inventory. For B2C launches in Japan, ignoring LINE Ads is 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%, closer in shape to Shopify embedded in Naver Search.

If you arrive in Korea with the European Google Ads + Meta + Shopify playbook, you’ll be invisible to half the market. The right playbook leads with Naver Search Ads + listings on Coupang AND Naver SmartStore + Kakao Moment, with Google Ads playing a supporting role.

Mobile-first as a hard constraint

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 - about three out of four - compared to 57-58% in Belgium.

The Korean consumer doesn’t just buy on mobile. They decide, compare, talk to support, and re-engage on mobile.

What this changes:

• 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 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 would be 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 is “this is overwhelming.” The Japanese reaction is “I trust this enough to buy.”

Korean LP conventions are similar but lean on a different signal: social proof through influencers and creators. A page that doesn’t show creator content, comparisons with named alternatives, and explicit credentialing will underperform.

Trying to “fix” an Asian landing page with European minimalism is a known way to halve conversion rates.

Performance benchmarks don’t transfer

This one bit me twice on the same trip. Both times I was looking at a screenshot of an Asian campaign performance and quietly thinking “those numbers can’t be real.”

They were real. The benchmarks were just different.

Korean B2C Q-Commerce CVRs of 6-8% are routine in categories where the European equivalent runs 1.5-2.5%. CPCs for a comparable keyword in Naver can run 30-40% below Google Ads Belgium. Japanese B2B lead-gen CTRs on display can sit around 0.8-1.2% (well above European norms).

(These figures are from accounts I’ve seen - verify against your own before targeting.)

The practical implication: never set Asian campaign targets using European benchmarks. Set provisional targets at “OK if X, good if Y,” and reset after two 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.

Don’t assume a GDPR-compliant stack is automatically PIPA-compliant. Don’t assume a Japanese campaign launch needs the same consent infrastructure as a European one.

What I’d do for a Brussels client entering Korea

The order I’d run if a European client briefed me on a Korea launch tomorrow:

• 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 single most common Asia-entry mistake.
• Build the LP mobile-first, full-density. Three to five times longer than your European equivalent.
• Budget 20-30% for Kakao Moment retargeting.
• Add KakaoPay and Naver Pay as default checkout options.
• Budget for influencer-driven content from week one.
• Set provisional 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 the meaningful 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 in repeat exposure.

What stayed the same

For all the differences, the underlying paid-marketing principles held up everywhere:

• Account structure matters.
• Creative testing pace beats creative perfectionism in every market.
• The first thing to fix is 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 not as paperwork but as design.
• If you’re a freelancer or small agency: running campaigns from Seoul for a few weeks (with the late-night infrastructure I wrote about here) gives you a permanent perspective shift.
• If a vendor proposes a Korea launch with “Google Ads + Meta + 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. Interface is stricter than Google’s.

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

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.

Closing thoughts

The eight years of Google Ads experience I brought to Asia weren’t wasted. The principles transferred. The discipline transferred. The attribution thinking transferred.

What didn’t transfer was 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 + Meta” thinking. For European clients considering Asia: budget for partnership and rewrite, not translate. 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.