Convert Multi-language JSON to String Catalog online
Upload a Multi-language JSON file and download it as Xcode String Catalog (.xcstrings). Translation keys, plurals and placeholders are preserved. Free, no account needed.
Pick the source format or let the converter detect it from the file.
Choose the format you want to download.
String Catalogs were introduced in Xcode 15 and store all languages, plural variants and device variations of a project in one JSON-based .xcstrings file.
Need it the other way round? Convert String Catalog to Multi-language JSON.
From: Multi-language JSON
A single JSON file where every translation key holds an object with one entry per language. Handy for small projects, static sites and CDN delivery because all languages travel together.
Used by: custom i18n setups, static site generators, CDN delivery. All languages in one file. Read the Multi-language JSON format guide.
{
"en_US": {
"hello.world": "Hello World!",
"my_address": "My address"
},
"pl_PL": {
"hello.world": "Witaj Świecie!",
"my_address": "Mój adres"
}
}To: Xcode String Catalog (.xcstrings)
String Catalogs were introduced in Xcode 15 and store all languages, plural variants and device variations of a project in one JSON-based .xcstrings file.
Used by: Xcode 15+, SwiftUI, iOS 17+. All languages in one file. Read the String Catalog format guide.
{
"sourceLanguage" : "en",
"strings" : {
"hello world" : {
"comment" : "My Hello World description",
"extractionState" : "manual",
"localizations" : {
"pl" : {
"stringUnit" : {
"state" : "translated",
"value" : "Witaj Świecie!"
}
}
}
}
},
"version" : "1.0"
}How to convert Multi-language JSON to String Catalog
- Drop your .json file into the converter above, or paste its content.
- Click Convert. You get a single .xcstrings file with all languages.
- Preview the result, copy it or download the file.
What changes between Multi-language JSON and String Catalog
- Keys, texts, plural forms and placeholders are mapped one to one. Comments and descriptions are kept when both formats support them.
Convert and translate in one place
If you need the String Catalog file in more languages, the fastest route is a free SimpleLocalize project: import the Multi-language JSON file, add languages, run auto-translation with DeepL, Google Translate, OpenAI, Claude or Gemini, and download the result as String Catalog. The CLI does the same from CI with upload and download commands, so the conversion becomes part of your build. See also translating Multi-language JSON files.
Frequently asked questions
Is the converter free?
Yes. There is no signup and no limit on the number of conversions beyond a few requests per second.
Are my files stored?
No. The file is parsed in memory, converted and returned in the same request. Nothing is written to disk or a database.
What about plurals and placeholders?
Plural forms are normalized to ICU message syntax and written back in the native form of String Catalog. Placeholders are kept, and Apple and Android specific syntax is translated between platforms. Read more in the pluralization guide.
Convert Multi-language JSON to other formats
Translate your String Catalog files
- Import Multi-language JSON or String Catalog files into a free project
- Auto-translate with DeepL, Google, OpenAI, Claude or Gemini
- Download in any of the supported formats or publish to the CDN