Convert CSV to Java Properties online
Upload a CSV file and download it as Java .properties. 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.
Key=value resource bundles used by Java, Spring Boot and Kotlin backends. Each language lives in its own messages_xx.properties file next to the default bundle.
Need it the other way round? Convert Java Properties to CSV.
From: CSV
A comma-separated spreadsheet with one row per translation key and one column per language. CSV is the easiest way to hand translations to people who work in Excel or Google Sheets.
Used by: Excel, Google Sheets, translation agencies. All languages in one file. Read the CSV format guide.
"key","english","polish"
"welcome","Welcome!","Witajcie"
"about-us","About Us","O nas"
"register","Register","Rejestracja"To: Java .properties
Key=value resource bundles used by Java, Spring Boot and Kotlin backends. Each language lives in its own messages_xx.properties file next to the default bundle.
Used by: Java, Spring Boot, Kotlin, Thymeleaf. One language per file. Read the Java Properties format guide.
# example comment
user.hello=Hello, {0}
hello.world=Hello World!How to convert CSV to Java Properties
- Drop your .csv file into the converter above, or paste its content.
- Click Convert. You get one .properties file per language.
- Preview the result, copy it or download the files.
What changes between CSV and Java Properties
- CSV holds every language in one file, so the converter writes one Java Properties file per language found in the source.
Convert and translate in one place
If you need the Java Properties file in more languages, the fastest route is a free SimpleLocalize project: import the CSV file, add languages, run auto-translation with DeepL, Google Translate, OpenAI, Claude or Gemini, and download the result as Java Properties. The CLI does the same from CI with upload and download commands, so the conversion becomes part of your build. See also translating CSV 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 Java Properties. Placeholders are kept, and Apple and Android specific syntax is translated between platforms. Read more in the pluralization guide.
Convert CSV to other formats
Translate your Java Properties files
- Import CSV or Java Properties 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