Fix the crawl and indexation issues holding your Magento catalogue back from organic revenue in Japan

Magento layered navigation is the faceted filter system that lets shoppers narrow categories by product attributes. For every filter combination, Magento generates a unique URL. In a Japanese Magento store with both Japanese and English attribute values — colour names in Japanese (赤, 青) and English (red, blue), size conventions in both systems — the URL proliferation from layered navigation is significantly larger than on a monolingual Western store. Japanese filter parameters also create percent-encoded URLs that are harder to manage in robots.txt and canonical tag configurations. The fix is a bilingual URL parameter strategy that addresses both Japanese and English attribute sets.

Japanese Magento stores have three main URL options: Japanese character slugs (percent-encoded UTF-8, e.g. /%E5%95%86%E5%93%81/), romaji slugs (phonetic Japanese in Latin characters), or English slugs with Japanese page content. Each has trade-offs. Japanese character slugs can rank better for Japanese queries but are difficult to canonicalise and debug. Romaji slugs are readable in URLs but may not match Japanese search query patterns well. English slugs are technically clean but may underperform for Japanese-language searches. We assess your target audience and existing URL structure to recommend the correct approach for your Google Japan ranking goals.

Magento 2 has significantly better SEO defaults for Japanese stores — including better multi-language store support, cleaner URL architecture for non-Latin characters, and improved sitemap configuration. For bilingual Japanese stores, Magento 2's multi-store architecture also provides a cleaner foundation for hreflang implementation. Magento 1 reached end-of-life in June 2020. Japanese retailers still on Magento 1 should treat migration as a priority.

Hreflang for Japanese/English Magento stores requires implementing both language codes correctly: ja for Japanese content and en (or en-JP, en-US, depending on the target market) for English content. Every page needs a self-referencing hreflang tag plus tags pointing to all alternate language versions. Sitemaps should also include hreflang entries for both language trees. Without correct hreflang, Google may rank the English page in Japanese search or vice versa — serving the wrong language to the wrong searcher.

A Magento SEO audit for a bilingual Japanese/English store takes longer than a monolingual audit. A catalogue of up to 5,000 SKUs in both languages typically requires 7–10 business days. Larger catalogues with complex bilingual layered navigation require 12–15 days. URL encoding assessment adds additional time for stores with Japanese character slugs.

Magento SEO for Japan-based stores typically starts from JPY 500,000–900,000 per month depending on catalogue size, bilingual scope, and target markets. Bilingual Japanese/English stores require additional scope for both language trees. The best starting point is a search diagnostic.

Mobile performance is critical for Magento SEO in Japan. Japanese internet usage is mobile-dominant, and Google Japan uses mobile-first indexing. Japanese Magento stores face an additional performance challenge: Japanese web fonts (for kanji, hiragana, katakana) are significantly larger than Latin typefaces and, without font subsetting and lazy loading, create substantial LCP penalties on mobile. We treat Japanese font performance as a core component of mobile Core Web Vitals work for Japanese Magento stores.

Magento's multi-store and multi-website features allow separate storefronts for Japan and international markets — each with their own URL, currency, and language settings. For SEO, this requires a correctly configured hreflang strategy across all storefronts: Japanese-language store (ja), English-language store (en), and any additional market variants. Without hreflang, Google may serve the Japanese storefront to international searchers or the English storefront to Japanese searchers. We design and implement hreflang for every active Magento market.