What is Angular Internationalization (i18n) and how does build-time translation work?

Senior Angular Published: Nov 21, 2025

Quick Answer Angular i18n extracts translatable text from templates at build time, merges translation files, and produces separate locale-specific bundles. Each locale is a separate build output. Use message IDs with i18n attribute:

Hello

. Extract with ng extract-i18n. Provide XLIFF/XMB translation files per locale. Runtime i18n libraries (ngx-translate) are easier to setup but less performant.

Answer

Angular i18n extracts translatable strings from templates and applies translations at build time.

The Angular compiler replaces template text with localized versions, generating separate build bundles for each locale. ICU expressions manage pluralization and formatting, improving runtime performance and memory usage.

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What is Angular Internationalization (i18n) and how does build-time translation work?

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