Many foreign companies enter Japan with a translated website and a keyword list converted from English. Then they wait, rankings do not come, and the conclusion is that “Japanese SEO is different” in some mysterious way.
It is different, but not mysteriously. This guide covers what actually decides whether a foreign company ranks in Japan, in the order the decisions come up.
The one decision everything else follows from
In our experience, translated content rarely ranks in Japan. Not because translation quality is poor — often it is excellent — but because a translated page answers the English version of the question.
Three things are local, and all three break translation:
- Query patterns. The words Japanese users type are usually not translations of the words English users type. They are often longer, frequently mix scripts, and cluster around different framings of the same need.
- Search intent. The same nominal keyword can carry a different intent in Japan — comparison-heavy where the English market is transactional, or vice versa.
- The evidence readers accept. Japanese readers often look for different trust signals: named supervision by a qualified professional, explicit company details, specific figures over broad claims.
So our working rule is: research in Japanese, write in Japanese, and let the English site be a separate asset rather than the source text.
Step 1. Decide where the Japanese site lives
Use a subdirectory on your existing domain — example.com/ja/ — unless you have a specific reason not to. In our view, it is the structure that best inherits the authority the main domain has already built. This is the decision that is expensive to reverse, so make it deliberately.
| Option | Works well when | Cost |
|---|---|---|
example.com/ja/ | You want the Japanese pages to inherit the authority of your main domain | Lowest. Usually the right default. |
example.jp or example.co.jp | Trust with Japanese buyers matters more than inherited authority — common for B2C and regulated categories | Starts from zero authority. .co.jp requires a company registered in Japan. |
jp.example.com | Rarely the best of either | Splits authority without the local trust benefit |
For most companies entering Japan, a subfolder on the existing domain is the pragmatic choice. The .co.jp option carries genuine trust weight with Japanese buyers — it is restricted to companies registered in Japan, and many Japanese users know that — but you are starting a new domain from nothing, which typically adds six to twelve months before organic traffic is meaningful.
Whichever you choose, set hreflang correctly between the English and Japanese versions. Mis-set hreflang is one of the most common technical faults we find on foreign companies’ Japanese sites, and it can quietly keep the right page from reaching the right audience.
Step 2. Do keyword research in Japanese, not in translation
Japanese is written in three scripts that mix inside a single query, and users choose between them inconsistently. The same product can be searched as kanji, katakana, hiragana, romaji, or an English loanword — often with different volumes and different intent behind each.
A practical example of the shape of the problem: a category term written in katakana may attract consumers comparing options, while the same concept in kanji attracts professionals looking for specifications. Translating your English keyword usually gives you only one of these, picked by chance.
What to actually do
- Start from Japanese autocomplete and related-query data, not from a translated seed list.
- Collect every script variant of your core terms and check the volume for each separately.
- Read the top ten results for each target query. In Japan, the SERP usually tells you the expected format — comparison table, ranking list, expert-supervised explainer — more reliably than any keyword metric.
- Map each query to one page. Japanese sites in competitive categories often lose more to cannibalization than to missing content.
Step 3. Produce the content natively
Write the Japanese content in Japanese from the start, rather than translating the English. This is where many Japan programs quietly fail: the page is grammatically perfect and reads like a translation, because the structure, the examples and the evidence were all chosen for a different reader.
For scale: we produce over 3,000 Japanese articles a year (2026 run rate), and for YMYL categories — health, finance, legal — every piece is supervised by a qualified professional from a panel of more than 250 doctors, tax accountants and similar qualified experts. That supervision is not decoration. In our view, named professional supervision is close to table stakes in Japanese YMYL search, and its absence is visible to both readers and search engines.
We cover the mechanics of Japanese content production separately in how to write SEO content for the Japanese market.
Step 4. Get the technical basics right for Japan
- Mobile. Most Japanese consumer search happens on mobile. Your Japanese pages should be designed mobile-first, not adapted from a desktop layout.
- Speed from Japan. Test load times from a Japanese location, not from your headquarters. Origin distance and CDN configuration can make a real difference here.
- Line breaking and typography. Japanese has no spaces between words. Long headings can break in awkward places and read as machine output. This is a small detail that many Japanese readers notice immediately.
- Structured data. Organization, Article, FAQ and — where relevant — LocalBusiness markup, with Japanese values rather than transliterated English ones.
Step 5. Build the trust signals Japanese buyers look for
E-E-A-T is not a Japan-specific concept, but the signals that satisfy it are often local.
- A proper 会社概要 (company profile) page with registered name, address, representative and founding year. Sparse company pages tend to read as untrustworthy in Japan in a way they do not in the US.
- Named authors and named supervisors, with credentials. Anonymous corporate content tends to underperform.
- Specific numbers with dates and sources. Many Japanese readers are comparison-driven and treat vague superlatives as noise.
- Consistent entity information across your site, Japanese business directories and any listings, so search engines can resolve you as one organization.
Step 6. Plan for AI answers, not just rankings
AI Overviews launched in Japanese on August 16, 2024, and AI Mode became available in Japanese on September 9, 2025. We think a meaningful share of Japanese informational queries is now answered above the organic results.
Yahoo! JAPAN’s organic results are supplied by Google, but AI Overviews and AI Mode do not appear on Yahoo! JAPAN, which shows its own AI-generated answers — see Google vs. Yahoo! JAPAN for how that relationship works.
We monitor AI citations weekly on our own Japanese media property. Over a recent six-month window, traffic arriving from AI assistants grew roughly 5.8x, and the property is cited in AI answers about 14,000 times a month as of August 2026. The pages that get cited tend to share a pattern: one clear claim per section, a date, a source, and unambiguous topical scope.
Step 7. Measure it properly
- Search Console is your primary source for Google. Yahoo! JAPAN runs on Google’s index, but its queries and clicks do not appear in Search Console, so check Yahoo! JAPAN traffic in your analytics.
- Segment by country and language. A global property tends to bury Japan.
- Track AI citation presence for your priority queries, on a schedule. In our view, rankings alone increasingly under-report the outcome.
- Record a baseline before you change anything. Obvious, often skipped, and hard to reconstruct later.
How long this takes, realistically
In our experience, Japanese SEO is no faster than SEO anywhere else, and we would be wary of anyone promising otherwise.
One recent B2B engagement is what we would call a normal good outcome: monthly clicks from Google grew from 56 to 751 over six months. That was a category with real competition, on a site that already existed. A new .co.jp domain in a crowded consumer category would probably be slower.
Since 2020 we have worked with 129 clients across 44 industries, all Japan-based, including Japanese subsidiaries of global companies. The pattern across them is fairly consistent: the programs that work commit to native production for at least two quarters before judging results.
The four ways Japan programs usually fail
- Translating the English site and calling it Japanese SEO. The most common in our experience, and the most expensive.
- Running Japan through a global agency with no Japanese-language research capability. The deliverables often look right in English but are not grounded in Japanese search data.
- Publishing anonymous corporate content in a category that requires named expertise. In YMYL, this can be close to fatal.
- Judging at 90 days. Japanese organic programs rarely show their shape before two quarters.
Common questions
Do I need a .co.jp domain to rank in Japan?
No. A subfolder on your existing domain can rank well. In our view, .co.jp buys trust with Japanese buyers, not ranking ability, and it costs you the authority your main domain already has.
Can I use machine translation with human post-editing?
For documentation and support content, often yes. For content meant to rank and convert, it inherits the structure and evidence of the English original, which, in our view, is the actual problem — not the wording.
Do I need to optimize separately for Yahoo! JAPAN?
Not for organic rankings — Yahoo! JAPAN’s results come from Google’s index. Its advertising, shopping and local listing systems are separate and do need separate work.
How much content do we need?
Fewer, better pages usually beat volume in Japanese search, particularly since AI answers began absorbing thin informational queries. Map one page per intent and resist publishing near-duplicates.
Further reading
Each part of the sequence above has a detailed piece behind it.
The search landscape
Research and writing
- Japanese keyword research
- Translation vs. localization for Japan
- The Japanese content calendar
- Writing Japanese content that ranks
- Content marketing in Japan
Structure and measurement
- Domain structure for Japan
- Japanese web design
- The Japanese WordPress stack
- The Japanese company profile page
- SEO tools for the Japanese market
By who you sell to
- B2B vs. B2C in Japan
- Consumer brands: where the demand sits
- Developer marketing in Japan
- Enterprise IT and the integrator layer
- B2B SaaS and comparison sites
Marketing, PR and media
Trust, distribution and local
Deciding and choosing
Entering Japan from
Working on Japan?
Nihongo Search is published by Amanaut, Inc., a small Japanese SEO and content company in Tokyo working with companies entering the Japanese market. Research, content, entity and structured data work are all produced natively in Japanese, and we measure both rankings and citations in Japanese AI answers.
Sources
- AI Overviews Japanese launch, August 16, 2024 — 窓の杜
- Yahoo! JAPAN’s use of Google search technology and the extension to March 31, 2027 — Web担当者Forum
Last reviewed: October 2026.
