JustI18n

JustI18n is a browser-based localization tool that uses GPT to translate product resource files into multiple languages. It accepts three specific formats: plain JSON resource files, Chrome extension message files, and Java properties resource bundles, which points it at developers and product teams shipping browser extensions or Java applications that need to go multilingual. Translation runs using the user's own OpenAI API key rather than a bundled subscription, so usage costs are billed directly through the user's OpenAI account. After generating translations, the tool checks that translated strings stay within a compatible length for the target format, and it lets users regenerate individual items rather than rerunning a whole file if one translation needs adjusting. Processing happens locally in the browser. The site is styled as a lightweight utility rather than a full localization platform: it does not publish a company name, founding year, or clear pricing beyond references to "Premium Features" that are not spelled out. That makes it best suited to developers who want a quick, low-cost way to translate a handful of resource files rather than teams managing translation across many languages or contributors at scale.