Free i18n & localization tools
Browser-based tools for developers working with internationalization. Nothing is uploaded and nothing is stored: every calculation runs on your own machine, with no signup.
The tools
Five tools that run in your browser
Locale reference, ICU message testing, file conversion, cost estimates and hreflang tags. Each one opens instantly and keeps working offline once the page has loaded.
Locale Explorer
Browse 250+ locales with Intl API examples, plural rules, and framework configs
ICU Playground
Test ICU message syntax with live preview, multi-locale output, and error explanations
File Converter
Convert between JSON, PO, XLIFF, ARB, YAML, CSV, Android XML, iOS Strings, and Properties
Cost Calculator
Estimate localization costs with side-by-side comparison of human, AI, and Better I18N pricing
Hreflang Generator
Generate and validate hreflang tags for multilingual SEO in HTML, XML sitemap, or HTTP headers
FAQ
