Japanese SEO keyword research for foreign brands starts with understanding how people actually type queries in Japanese: a mix of kanji, kana (hiragana and katakana), and sometimes romaji. Using the wrong script can mean missing most of your potential search volume, even if the “meaning” of your keyword is technically correct. It is important to do your SEO keyword research before tackling the market — here is our advice on getting started.
Why writing systems matter in Japanese SEO
Japanese uses four scripts: kanji, hiragana, katakana, and romaji. Users freely mix them in search. For many commercial queries, kanji dominates, but mixed forms with kana still represent a large share of searches.
Kanji tends to appear in more formal or core concept searches, such as “営業ツール” (sales tool).
Katakana is common for borrowed or technical words like “マーケティング” or “オートメーション”.
Hiragana often appears in more casual phrases or function words. It can change nuance, especially in question-style queries.
Romaji is mainly used for brand names, global terms, and by non-native speakers. It is a minority of total searches.
Kanji: your default for core concepts
For most Japanese users, kanji-based queries are the default when a concept has a well-known kanji form. In one example, searches for “body” in kanji far outnumbered hiragana, katakana, and romaji variants, illustrating how dominant kanji can be.
Practical tips:
Use kanji for core business concepts: consulting, tools, services, locations, and industries.
Build your primary keyword list around kanji terms, then test mixed versions (kanji + katakana) for key services.
Check for homonyms: different kanji with similar readings can carry different meanings, which affects relevance and click-through.
Common pitfalls:
Relying only on machine translation and picking rare or unnatural kanji for common business terms.
Ignoring long-tail kanji phrases that reflect real intent, like “導入 事例” (implementation case studies) or “失敗 しない” (how not to fail).
Kana: when hiragana and katakana shine
Kana covers hiragana and katakana. Subsequently, both appear in search behaviour in different ways. Optimizing only for kanji can cause a foreign brand to miss traffic from kana-heavy queries, especially in branding and foreign-word categories.
Hiragana:
Often used in casual expressions, questions, and function words around the main keyword.
Appears in “how-to” and problem-style searches that may not be fully expressed in kanji.
Katakana:
The main script for foreign loanwords, product categories, and many tech or marketing terms.
Different katakana spellings (long vowels, small tsu, etc.) can exist for the same foreign word. Users may use more than one version. It is important to consider multiple spellings for cases like this!
Practical tips:
For foreign concepts (AI, SaaS, marketing tools), always check both kanji and katakana variants.
Include katakana versions of major product or service names in key on-page elements: titles, H1s, and early body copy.
Pay attention to how Japanese competitors write category names. Often, their katakana usage reflects dominant search habits.
Common pitfalls:
Assuming one katakana spelling is enough when multiple versions are in active use.
Overusing katakana where kanji is expected, making content feel “foreign” and therefore less trustworthy to local users.
Mixed forms: how people really search
Many real Japanese queries mix scripts, especially in commercial searches that combine a kanji concept and a katakana brand or category.
An example is “京都のホテル”.
Patterns to consider:
Location (kanji) + category (katakana), such as
“東京 マーケティング エージェンシー”.
Core concept (kanji) + foreign modifier (katakana), like
“営業ツール” vs “セールスツール”.
Brand in katakana plus functional keyword in kanji or kana.
Practical tips:
Build keyword clusters that deliberately include mixed-script combinations. Single-script variants are not so common.
Use mixed forms in headings and internal links to reflect how people type queries. Simultaneously, this will increase semantic coverage.
When romaji actually works
Romaji (Latin letters) is the least common option for native users. However, it remains important in certain situations. It is frequently used for brand names, global product lines, and by tourists or non-Japanese residents searching in Japan.
Use romaji when:
Your official brand is globally written in Latin letters and recognized that way in Japan.
Targeting non-native residents, tourists, or global buyers physically located in Japan who are more likely to search in romaji or English.
Creating URLs and some technical elements, where Japanese characters can still cause encoding or display issues.
Practical tips:
Pair romaji with kanji or katakana in titles and introductions, for example: “AIマーケティング (AI marketing) for Japan”.
Avoid romaji-only keyword strategies for local Japanese audiences. Treat romaji variants as secondary or tertiary targets.
Common pitfalls:
Using romaji for core Japanese terms that users overwhelmingly type in kanji or kana. Do your research on your market beforehand!
Building URL structures filled with Japanese characters. These can create ugly encodings when shared.
How to do Japanese SEO keyword research step by step
A structured process helps foreign brands avoid guesswork and over-reliance on direct translation. Combining local tools with global platforms gives a clearer picture of demand across scripts.
Start with business topics (not translations) and list out the problems, solutions, and categories plainly.
For each concept, identify candidate kanji, hiragana, katakana, and romaji variants, including mixed forms.
Use Japan-capable keyword tools to compare volumes and SERPs.
Check live SERPs to see which script dominates the top-ranking pages and how competitors write terms.
Prioritize one “primary” script per keyword (often kanji or katakana) and list 2–3 secondary variants to include naturally in content.
- Consult with Sakura Digital AI for tailored assistance and advise for your business goals and market to maximize your output!
Common pitfalls foreign brands should avoid
Foreign brands entering Japan often repeat the same errors that limit their organic growth in their respective market.
Key pitfalls:
Treating keyword research as a translation exercise instead of a discovery process rooted in Japanese user behaviour.
Ignoring script variants that show strong search volume and intent in favour of “brand-preferred” spellings.
Using romaji as the primary targeting method for Japanese audiences.
Publishing thin, English-style landing pages with minimal detail in Japanese. Generally, these do not match local expectations for information density.
Focusing on the right mix of kanji, kana, katakana, and carefully chosen romaji gives foreign brands a realistic chance to rank, attract qualified traffic, and convert local users in Japan. If you need help with your SEO keyword research, don’t forget to schedule a consultation with Sakura Digital AI today!