VS Code Extension available! Install nowTranslate Flutter ARB files online
Upload your .arb files to SimpleLocalize, add languages, auto-translate and download one .arb file per language in seconds.
{
"@@locale": "en",
"hello.world": "Hello World!",
"@hello.world": {
"description": "Hello world message"
}
"my_address": "Address",
}What is the Flutter ARB format?
Application Resource Bundle files are JSON documents with ICU message syntax and optional @metadata entries. Flutter's gen_l10n tool turns them into typed Dart localization classes.
It is used by Flutter, Dart intl, gen_l10n. SimpleLocalize reads and writes it natively, so you keep your existing project structure. Format value for the CLI and API: arb. Read the format documentation.
How to translate Flutter ARB files
- Create a free account and a project. The Community plan covers small apps with no credit card.
- Import your .arb file in the web editor, or push it from the terminal with the CLI.
- Add target languages and run auto-translation. Use DeepL or Google Translate for speed, or OpenAI, Claude and Gemini with your own API key for context-aware translations.
- Review in the editor with QA checks, glossary and screenshots, then download the ARB files or publish them to the translation hosting CDN.
Sync ARB files from CI
Add a simplelocalize.yml to the repository and run simplelocalize upload and simplelocalize download in your pipeline or GitHub Action:
# simplelocalize.yml
apiKey: YOUR_PROJECT_API_KEY
uploadFormat: arb
uploadPath: ./locales/{lang}.arb
downloadFormat: arb
downloadPath: ./locales/{lang}.arbConvert ARB to other formats
The same project can export translations in more than 30 formats, and the free online converter works without an account:
Start translating ARB files
- Native Flutter ARB import and export
- Auto-translation with DeepL, Google, OpenAI, Claude and Gemini
- Translation editor, QA checks, CLI and CDN on the free plan