How to Localize an App: iOS, Android, Screenshots & Store Listings

Mobile app localization is not just a translation pass. The app, the store listing, and the screenshots all need to feel native to the market you are entering. A user in Japan, Germany, Brazil, or Korea should understand the promise before they install.

Step-by-step app localization process

iOS localization checklist

• Move interface text into string catalogs or Localizable.strings.
• Localize title, subtitle, promotional text, and the 100-character keyword field.
• Create App Store screenshots for iPhone and iPad sizes used by each locale.
• Review Product Page Optimization variants separately for major markets.

Android and Google Play localization checklist

• Move UI copy into Android XML string resources and name placeholders clearly.
• Localize app name, short description, long description, screenshots, and feature graphic.
• Check phone, tablet, Chromebook, and large-screen screenshot requirements.
• Use Play Console store listing experiments when you need market-specific proof.

Pick markets with a business reason

The fastest localization wins usually come from markets that already show weak organic signals: impressions without conversion, downloads without retention, competitor strength, or paid campaigns that perform better than the English listing. Do not start with 30 languages because the tool can do it. Start with the markets where localized screenshots, metadata, and in-app copy can change a real growth metric.

Translate store copy and screenshots together

A common failure mode is translating metadata in a spreadsheet and screenshots in a design file. The result is often two slightly different promises: the subtitle says one thing, the first screenshot says another, and the long description uses a third term. Users notice that drift. App stores also index localized fields separately, so scattered terminology wastes search relevance.

Launch sequencing

Start with markets where you already see organic downloads or strong competitor demand. Localize the app store product page first, then ship in-app strings, screenshots, and support content together. After launch, track keyword rank, conversion, retention, and review language before expanding into the next group of locales.

Localization QA checklist

What to measure after localization

Treat localization like a launch experiment. Track impressions, product page views, conversion rate, keyword ranking, trial starts, retention, reviews, and support tickets by locale. If screenshots improve conversion but retention falls, the store promise may be too aggressive. If impressions rise but conversion stays flat, the localized keywords may be working while the visuals still need market-specific proof.