Most indie developers leave a huge pile of installs on the table for one boring reason: their store listing only exists in English. If someone in Brazil or Japan or Germany lands on your page and the title, description, and screenshots are all in a language they don't read well, they bounce. Localization fixes that, and on Google Play it's free to do. The catch is that doing it properly is more than running your description through a translator.
Short version: localizing your top few language markets can unlock the majority of your non-English downloads, often 70 to 80 percent of them in most categories. But localization is not the same as translation, and the developers who treat it like a copy-paste job usually see disappointing numbers. Here's how to do it so it actually moves installs.
Localization is not translation
This is the part people skip. Translation is swapping English words for words in another language. Localization is adapting the whole listing to how a specific market searches, talks, and decides. That means using the keywords locals actually type, matching tone and formality to the culture, converting prices and units, and sometimes reframing your value prop entirely because what sells in the US doesn't always sell elsewhere.
A word-for-word translation can be technically correct and still convert badly because it reads like a foreign brand trying too hard. When you localize for conversion instead of accuracy, the numbers follow. Think of translation as the floor, not the goal.
Why it moves installs so much
The mechanism is simple. When a user's device language matches your listing language, they're far more likely to hit install. Store algorithms also factor language relevance into ranking, so a localized listing surfaces more often for searches in that language. You get both a ranking lift and a conversion lift from the same work.
And the coverage math is generous. Translating your top five language markets typically reaches 70 to 80 percent of non-English downloads in most categories, because app installs cluster heavily in a handful of big languages. You don't need all 70-plus languages to capture most of the upside. You need the right five or six.
What to localize first
Prioritize in order of impact. Your app title and short description come first, since they're the highest-visibility text and they carry the most keyword weight. Then the full description, where you've got room to work in localized keywords naturally (our guide to writing Google Play descriptions that convert applies in every language, you just apply it per locale). Then, and this is the one people forget, your screenshots.
The screenshot mistake that quietly kills conversion
Here's the most common localization failure: teams translate all the text fields but leave the screenshots in English. In markets with lower English proficiency, that's a real conversion killer. The screenshots are the biggest visual surface on your listing, especially on Google Play, and if the captions on them are in a language the user can't read, the localized title above them doesn't save you.
Localizing screenshot captions for your top markets lifts conversion more than most developers expect. You don't need a designer for this either, our walkthrough on making Play Store screenshots without Figma works just as well for producing localized versions.
Do keyword research per language, not once
Do not translate your English keywords and assume they're your foreign keywords. People in different markets search with different words, different synonyms, and sometimes English loanwords you'd never guess. A direct translation of your best US keyword might be a phrase nobody actually types. Run fresh keyword research for each locale you target, using that language's real search terms. This is where a lot of the ranking upside lives, and it's the step machine translation can't do for you.
Google Play vs the App Store
The two stores handle localization a little differently. Google Play Console supports localized listings for more than 70 languages, and lets you translate the title, short description, full description, and graphics independently per language. Apple expanded its localization support in 2026, taking App Store Connect from 39 to 50 supported localizations, so there's more reach available on iOS than there used to be. If you're shipping to both, our breakdown of Apple App Store vs Google Play ASO covers the other differences worth knowing.
Custom store listings vs translated listings
One Google Play feature worth knowing: beyond straight translated listings, you can build custom store listings targeted at specific countries or audiences, even within the same language. That lets you tailor messaging for, say, Mexico versus Spain, or run a different pitch for users coming from a specific campaign. It's more work, but for your biggest markets it can squeeze out extra conversion that a single shared translation can't.
How to prioritize which markets to localize
Look at where your installs and your traffic already come from, then weight toward languages with large app economies, Spanish, Portuguese (Brazil), German, French, Japanese, and Korean are common high-return choices. Localize those first, measure the conversion lift per locale, and expand from there. Don't spread yourself across twenty half-finished translations. A handful of fully localized listings, screenshots included, beats a long list of text-only ones.
How IOn Emit helps
Writing and scoring a strong listing in one language is hard enough; doing it across five is where most solo developers stall. IOn Emit includes a 100-point ASO scoring system and AI-assisted description generation, so you can draft, score, and refine each localized listing against the same standard instead of guessing whether your German full description is actually optimized. Pair it with the full Google Play ASO guide and you've got a repeatable process for every locale you add. The free tier covers ASO scoring and keyword analytics, which is plenty to localize your first few markets properly.
The bottom line
App store localization is one of the highest-return things an indie developer can do, because it's free on Google Play and it unlocks the majority of your non-English installs. But it only works if you localize instead of just translating, do real keyword research per language, and remember to localize your screenshots, not just the text. Start with your top five markets, get those fully done, measure, and expand. Done right, the same app gets a lot more downloads without spending a cent on ads.