Translate your App Store listing into Japanese
Japanese (日本語) — ≈125 million native speakers, serving the App Store in Japan. Here’s what a Japanese localization is worth and how to ship one in minutes.
Why localize for Japanese?
Japan is one of the highest-ARPU App Store markets in the world, and English listings are close to invisible there — the overwhelming majority of searches happen in Japanese.
App Store search is per-locale: queries typed on the Japan storefront match against the ja localization of your metadata. Without one, your app doesn’t rank for Japanese searches at all — no matter how strong your English keywords are.
Japanese-specific translation tip
Japanese fits far more meaning into 30 characters, so use the name and subtitle to state concrete benefits. Include katakana loanwords in keywords — users search both spellings.
StoreTranslate bakes language-specific guidance like this into its prompts, along with each field’s character limit and any custom instructions you add — brand terms to preserve, tone to match.
What gets translated
| Field | Limit (Japanese included) |
|---|---|
| App name | 30 characters |
| Subtitle | 30 characters |
| Promotional text | 170 characters |
| Description | 4,000 characters |
| Keywords | 100 characters |
| What's New (release notes) | 4,000 characters |
Field-level strategy lives in our guides on translating the description and translating keywords.
How it works
- Connect your App Store Connect API key — credentials are never stored.
- Pick your app, a version in an editable state, and Japanese (plus any other targets).
- Run the job. AI translates each selected field within its limit and uploads the ja localization via the App Store Connect API.
- Review in App Store Connect and submit with your next version.
Other languages
Japanese localization FAQ
Which App Store locale code is Japanese? ＋
Japanese metadata uses the ja localization in App Store Connect, covering the storefronts for Japan.
Do character limits change for Japanese? ＋
No — the App Store’s limits (30 characters for name and subtitle, 100 for keywords, 170 for promotional text, 4,000 for the description) apply to every language, including Japanese. StoreTranslate validates each field against these limits before uploading.
Can I translate only some fields into Japanese? ＋
Yes. Pick exactly which fields to translate — most developers start with keywords and the description, keeping the app name unchanged. Existing translations are only overwritten if you choose to.
How do I add a Japanese localization in App Store Connect? ＋
Open your app in App Store Connect, select a version in an editable state, and add Japanese from the language menu — or let StoreTranslate create and fill the localization for you through the App Store Connect API.