Most international companies arrive at Japanese SEO with a working programme somewhere else. There is a content calendar, a technical backlog, a rank tracker, someone who knows what a canonical tag is. The instinct is to treat Japan as another locale in an existing system.
That instinct gets you about a third of the way. The mechanics of SEO are the same everywhere — crawlable pages, relevant content, credible signals. What changes in Japan is every input those mechanics operate on: which words people type, what they expect to find, which sites already occupy the results, and what makes a company look legitimate.
This guide walks through the parts that actually differ, in the order you will meet them.
The search landscape is narrower than you think, and wider
Google is the dominant general search engine in Japan, and Yahoo! Japan — still a heavily used portal — has for many years run on Google’s search technology. In practice this means one set of ranking work covers the large majority of web search, which is simpler than most people expect before they look.
The complication is elsewhere. A meaningful share of Japanese commercial search results is occupied not by vendor websites but by comparison and aggregator media — 比較サイト (hikaku saito, “comparison sites”) and industry-specific review platforms. For a lot of B2B software categories, the first screen of results is a ranked list of “the 15 best tools for X” published by a media company, not any of the tools themselves.
Discovery also happens off web search in ways that shape it: X (Twitter) has an unusually engaged Japanese user base, LINE is a primary messaging surface, and YouTube carries a lot of category research. These are not places you “do SEO”, but they influence the branded search demand that your organic programme eventually harvests.
The practical consequence: before you plan any page, look at what currently ranks for the query you want. If the answer is “six comparison articles and a Wikipedia entry”, your route to that traffic may be getting listed on the comparison sites rather than out-ranking them.
Japanese is not a language you can research through translation
This is the single most expensive mistake, and it deserves its own treatment — we wrote one at Why Translating Your Website Is Not Japanese SEO. The short version:
Japanese uses three scripts at once. Kanji (漢字), hiragana (ひらがな) and katakana (カタカナ) all appear in ordinary running text, and the same concept can be searched in several of them. “Security” might be searched as セキュリティ (sekyuriti, the katakana loanword) or 安全性 (anzensei, the native compound), and those are different queries with different intent behind them.
There are no spaces between words. Search engines segment Japanese text algorithmically, which means the boundaries you assume exist may not be the boundaries the engine finds. Compound terms behave differently from the way an English marketer expects.
And loanwords are not stable. Some English terms are used untranslated in katakana across an entire industry; others were displaced by a native coinage years ago; others are used by vendors but never by buyers. You cannot tell which is which by reasoning about it. You have to look at the demand data and at what ranks.
So: keyword research for Japan starts in Japanese, from Japanese sources — Keyword Planner set to Japanese and Japan, Google autocomplete and related searches, the questions people actually ask on Q&A platforms, the language your own Japanese sales and support conversations use, and the vocabulary in the pages that already rank. Translated keyword lists are, at best, a hypothesis.
Content: the expectations are different, not just the language
Japanese B2B buyers tend to read more before they talk to anyone, and they tend to expect more detail on the page. A short, punchy value proposition that works in the US often reads as thin and slightly evasive in Japan.
Things that Japanese B2B sites do as a matter of course, and that overseas sites frequently omit:
- 会社概要 (kaisha gaiyō, company overview) — a page with the legal entity name, address, representative director, founding date and capital. It is a routine credibility check.
- 導入事例 (dōnyū jirei, implementation case studies) — named, specific, with the customer’s situation and what changed. Anonymous “a large manufacturer” studies carry much less weight.
- 資料ダウンロード (shiryō daunrōdo, document downloads) — a detailed PDF explaining the product is a normal, expected conversion step, often ahead of a demo request.
- Comparison and pricing clarity. “Contact us for pricing” is common, but pages that explain how pricing is structured, even without numbers, do noticeably better at holding attention.
Tone matters too. Business Japanese uses 丁寧語 (teineigo, polite form) as a default; the informal, personality-forward voice a lot of Western SaaS brands use does not transfer. This is not something a translator fixes after the fact — it is a brief you give to a Japanese writer before they start.
Our view on how this should be produced is on the Japanese content SEO page: research in Japanese, brief in Japanese, write in Japanese, and use the English source material as input rather than as a script.
Technical: mostly familiar, with a few Japan-specific traps
If your technical SEO is in decent shape globally, most of it carries over. The Japan-specific issues that come up repeatedly:
Hreflang and URL structure. Getting the Japanese version discoverable, self-canonical and correctly paired with the rest of the site is the foundation everything else sits on. It is fiddly and it is frequently wrong — see Hreflang for Japan.
Automatic IP redirects. Sending every visitor from a Japanese IP to /ja/ breaks more than it fixes: Googlebot crawls predominantly from US IPs, and users who want the English page cannot reach it. Offer a dismissible suggestion instead of a forced redirect.
Encoding and half-width/full-width characters. UTF-8 everywhere, and be consistent about full-width (１２３, ＡＢＣ) versus half-width (123, ABC) forms in titles and headings. Mixed usage looks careless to a Japanese reader.
Rendering. Japanese-language content injected client-side is exactly as risky as English content injected client-side, but the failure is harder to spot when nobody on the team reads the rendered output.
Search Console. Verify the property, and then filter by country and by query language rather than trusting site-wide averages. A Japanese section inside a large global site is invisible in aggregate data.
Authority: earned slowly, through recognisable Japanese sources
Links from your global domain’s existing profile do carry over — that is one of the genuine arguments for a subdirectory, which we cover in Do You Need a .co.jp Domain?. But Japanese-language, Japan-hosted references do work that a US backlink profile cannot: they establish that you exist here.
The realistic sources are press release distribution, coverage in Japanese industry and trade media, industry association membership, partner and distributor sites, event and conference listings, and getting into the category comparison sites mentioned earlier. Most of this is PR and business development that produces SEO value, not link building in the transactional sense. Paid link schemes exist in Japan as everywhere; they carry the same risk as everywhere.
Measurement: set the timeline before you set the target
Two things are worth agreeing internally before the work starts.
First, what you will measure. Non-branded Japanese organic sessions, qualified enquiries from Japan, and visibility for a defined keyword set are all reasonable. Total organic traffic to the Japanese section is not, because it moves with brand awareness and campaign activity that has nothing to do with SEO.
Second, how long you will wait. We are not going to give you a number, because the honest answer depends on how much authority the domain already has, whether the Japanese section is new or an existing translation being rebuilt, and how competitive the category is. A well-established global domain adding a properly researched Japanese section moves faster than a new domain starting from nothing — sometimes considerably faster. Anyone who quotes you a fixed timeline without asking those questions is guessing.
A sensible order of operations
If you are starting, this sequence avoids the most rework:
- Fix the technical foundation — URL structure, hreflang, indexability — before publishing anything at volume.
- Do real Japanese keyword research, and map it to intent by looking at what ranks today.
- Build the pages that serve commercial intent first: the product or service pages people search for by name, not the blog.
- Add the credibility pages Japanese buyers look for.
- Then start on editorial content, informed by what the first four steps taught you.
- Work on Japanese-language authority continuously, in parallel, because it is the slowest input.
Companies that go in the other order — blog first, technical last — usually end up republishing the blog.
If you want to talk through where your site currently sits on that list, get in touch. If you are earlier than that and still deciding whether Japan is the right market to invest in, the Japan market entry page covers the questions worth answering first.