Free Tools
i18n Developer Tools
Free online tools to streamline your internationalization workflow. No signup required.
ICU Message Editor
Popular
Build and test ICU MessageFormat strings with live preview, 100+ templates, syntax validation, and code snippets for popular i18n libraries.
JSON Translation Differ
New
Compare translation JSON files side-by-side. Find missing keys, changed values, and structural differences between versions or branches.
ICU MessageFormat Guide
Complete reference for ICU MessageFormat syntax. Learn pluralization, select, number/date formatting, and nested messages with examples.