Data localization service made available by a web browser

A data localization service is provided for a web browser residing on a computing device. Depending upon the availability of the network connection as well as the level of native support in the browser, the data localization service will support different levels of service/performance to optimize the user experience. To do so, the data localization service includes a priority handler configured to receive a request to localize data from a requesting client application and provide in response thereto a localized representation of the data to the requesting client application. The data localization service may also include a native data localizer configured to receive a request to localize data from the priority handler and localize the data in accordance with a localization preference parameter indicative of a locale. The native data localizer may be a function integrated into the script interpreter of the web browser.