Convert RESX to ARB online
Upload a .NET RESX file and download it as Flutter ARB. Translation keys, plurals and placeholders are preserved. Free, no account needed.
Pick the source format or let the converter detect it from the file.
Used when the source format holds one language per file. Also used as the source language for XLIFF output.
Choose the format you want to download.
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.
Need it the other way round? Convert ARB to RESX.
From: .NET RESX
XML resource files used by .NET, ASP.NET Core, Blazor, MAUI and WPF. Each data element holds a name, a value and an optional comment for translators.
Used by: .NET, ASP.NET Core, Blazor, MAUI, WPF. One language per file. Read the RESX format guide.
<?xml version="1.0" encoding="utf-8"?>
<root>
<data name="WelcomeMessage" xml:space="preserve">
<value>Witamy w naszej aplikacji!</value>
<comment>To jest wiadomość powitalna wyświetlana na ekranie głównym.</comment>
</data>
<data name="ExitMessage" xml:space="preserve">
<value>Czy na pewno chcesz wyjść?</value>
<comment>Komunikat, który pyta, czy użytkownik chce opuścić aplikację.</comment>
</data>
<data name="SubmitButton" xml:space="preserve">
<value>Wyślij</value>
<comment>Tekst na przycisku wyślij.</comment>
</data>
</root>To: Flutter ARB
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.
Used by: Flutter, Dart intl, gen_l10n. One language per file. Read the ARB format guide.
{
"@@locale": "en",
"hello.world": "Hello World!",
"@hello.world": {
"description": "Hello world message"
}
"my_address": "Address",
}How to convert RESX to ARB
- Drop your .resx file into the converter above, or paste its content.
- Confirm the language of the file. It is guessed from the file name, for example
de.jsonormessages_pt-BR.properties. - Click Convert. You get one .arb file per language.
- Preview the result, copy it or download the files.
What changes between RESX and ARB
- 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 ARB file in more languages, the fastest route is a free SimpleLocalize project: import the RESX file, add languages, run auto-translation with DeepL, Google Translate, OpenAI, Claude or Gemini, and download the result as ARB. The CLI does the same from CI with upload and download commands, so the conversion becomes part of your build. See also translating RESX 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 ARB. Placeholders are kept, and Apple and Android specific syntax is translated between platforms. Read more in the pluralization guide.
Convert RESX to other formats
Convert other formats to ARB
Translate your ARB files
- Import RESX or ARB 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