Key-Value Preservation
Keys are never translated or modified. Every key-value pair, comment, and blank line stays exactly as in the original .properties file.
Translate .properties Files Online - Escapes & Unicode Preserved
Upload your .properties file and get accurate translation in 100+ languages. Keys, Unicode escapes, placeholders, and comments - all preserved. Git-friendly output.
Properties workflow
Translation example
A Java .properties file, English to Spanish
The checkout strings of a Java ResourceBundle, written for this page: {0} placeholders, quotes and comments. Keys and comments stay; the values are translated.
Source
Result
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Keys and their order unchanged
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Every {0} placeholder kept
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Every string with words translated
8 of 8 strings that contain words differ from the source.
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Comment lines
Comments are notes for translators and stay as written.
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Escaped quotes kept
2026-10-08 verified — Amanda Lee
Properties features
Unicode Escape Safety
Unicode escape sequences (\uXXXX) are preserved or generated correctly. Native2ASCII and UTF-8 encoding both handled natively.
Lightning-Fast Results
Most .properties files are translated in seconds. Cloud-based AI handles resource bundles with thousands of key-value pairs.
100+ Languages Supported
Translate .properties files between 100+ languages including Spanish, French, German, Arabic, Chinese, Japanese, and Korean.
Why ForgeFile Is the Best .properties Translator
Need to translate a .properties file without breaking Unicode escapes, placeholders, or key-value structure? ForgeFile is an AI-powered Java properties translator that converts your resource bundles into 100+ languages while preserving every key, Unicode escape sequence, MessageFormat placeholder, and comment. Whether it's a Spring Boot app, an enterprise Java platform, or an Android project, your translated .properties file compiles and deploys without changes.
How ForgeFile Translates .properties Files
Our translation engine understands the .properties format natively. When you translate a properties file, ForgeFile:
- Parses key-value pairs, preserving keys exactly and translating only values
- Detects and protects MessageFormat placeholders ({0}, {1,date}, {2,number})
- Handles Unicode escape sequences (\u00XX) and outputs them correctly for Java compatibility
The result is a valid .properties file you can commit directly to your repo - no broken escapes, no missing keys, no encoding issues.
Unicode & Escape Sequence Safety
Java .properties files have unique encoding requirements. ForgeFile handles them all:
- Unicode escape sequences (\uXXXX) are preserved or generated as needed
- Native2ASCII encoding is supported for legacy Java systems
- UTF-8 .properties files (Java 9+) are handled natively
- Special characters (=, :, #, !) are properly escaped in values
- Multi-line values with backslash continuation are preserved
Built for Java, Spring Boot & Enterprise Apps
ForgeFile handles the .properties files Java teams work with every day:
- Java Resource Bundles - translate messages.properties, labels.properties, and error bundles for i18n
- Spring Boot Applications - localize application.properties, validation messages, and UI strings
- Enterprise Java (Jakarta EE) - translate JSF resource bundles, EJB messages, and portal content
- Android Development - localize strings.properties and configuration files for mobile apps
Batch upload and API access are available for CI/CD pipeline integration. All files are encrypted in transit and at rest - fully GDPR-compliant.
Why Java Teams Choose ForgeFile for .properties Translation
- Key-Safe Translation - keys are never modified, only values are translated
- Unicode Escape Handling - \uXXXX sequences preserved or generated correctly
- 100+ Languages - including right-to-left scripts (Arabic, Hebrew) and CJK characters
- Git-Friendly Output - clean formatting for diff-friendly version control
- No Software to Install - works entirely in your browser
Upload your .properties file now for accurate, escape-safe resource bundle translation.
The Java .properties format is documented in the official Java Properties class documentation.
How to Translate a .properties File in 4 Steps
- 1
Upload Your .properties File
Drag and drop your .properties file, or browse to select it. We support resource bundles with any encoding.
- 2
Select Source & Target Language
Choose from 100+ languages. ForgeFile auto-detects the source language and understands Java/Spring terminology.
- 3
Configure Translation Settings
Choose Unicode output mode (escape sequences or native UTF-8). Select whether to preserve or translate comments.
- 4
Download Your Translated File
Your translated .properties file is ready in seconds. All keys, escapes, and placeholders are preserved - commit directly to your repo.
.properties Translation FAQ - Common Questions Answered
How do I translate a .properties file online?
Upload your .properties file to ForgeFile, select your target language, and click Translate. Our AI translates values while preserving all keys, Unicode escapes, and placeholders - typically in seconds.
Are keys translated or modified?
No. ForgeFile translates only values. Keys are never modified, renamed, or reordered. Your translated file maps 1:1 with the original resource bundle.
Are Unicode escape sequences preserved?
Yes. ForgeFile handles \uXXXX escape sequences correctly - preserving them for legacy Java systems or generating native UTF-8 for Java 9+ projects.
Are MessageFormat placeholders preserved?
Absolutely. ForgeFile detects and protects {0}, {1,date}, {2,number}, and other MessageFormat patterns. Your application logic works in every language.
Does it work with Spring Boot?
Yes. ForgeFile handles application.properties, messages.properties, validation messages, and all Spring Boot resource bundles with full key-value preservation.
Are comments preserved in the output?
Yes. All # and ! comments, blank lines, and file structure are preserved exactly. Your codebase documentation stays intact.
Is my .properties file secure during translation?
Files are encrypted in transit and at rest. How long they are kept depends on your plan.
What is the difference between .properties and JSON for Java localization?
.properties is the native Java resource bundle format with Unicode escape support. JSON is format-agnostic and common in web apps. ForgeFile handles both with full structure preservation.
Guides for this workflow
Ready to Translate Your Resource Bundles?
Upload your .properties file and get CI/CD-ready translated output in seconds. Keys, escapes, and comments preserved, every time.