Simple Locale Changer is a free Chrome extension designed for developers to test website localizations quickly and effectively. This tool allows users to temporarily modify the language and region settings of their browser session without affecting system configurations. It overrides the Accept-Language headers in all HTTP requests, as well as JavaScript properties such as navigator.language and navigator.languages, ensuring accurate testing for various locales.

The extension is particularly useful for assessing translations and regional behaviors in web applications. Its user-friendly interface enables developers to select their desired locale, apply the changes, and refresh the page to observe the results instantly. This straightforward approach streamlines the localization testing process, making it an invaluable resource for web developers.