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Before you configure search, identify what visitors need to find
List the content types your search should cover: posts, pages, WooCommerce products, custom post types, and any content stored in custom fields. Then check how the search works on the front end. A theme using the standard WordPress search query is a different case from a custom search form or a plugin that builds its own index.
This inventory matters because multilingual support for standard search does not automatically extend to every custom query or search index. TranslatePress documents language-filtered results for standard WordPress search and a WooCommerce product-search route, but notes limitations for custom fields and indexed search plugins. [TranslatePress multilingual search guide] [TranslatePress custom search documentation]
Choose a multilingual plugin based on your search setup
| Option | What its reviewed documentation establishes | What to check on your site |
|---|---|---|
| TranslatePress with standard WordPress search | Its guide describes results filtered to the selected language. It also documents a WooCommerce product-search route. [TranslatePress guide] | Translate the relevant titles and content, then test your actual search form and templates in each language. |
| TranslatePress with custom or indexed search | Its developer documentation describes handling searches with WP_Query, pre_get_posts, and the trp_force_search filter. It says index-based search plugins do not work correctly out of the box, and translated custom fields are not searchable in the described approach unless exposed through the_content. [TranslatePress custom search documentation] |
Plan a specific integration and test it against your plugin versions, theme, content model, and language configuration. |
| WPML | Its setup documentation covers site and target languages, language URL formats, switchers, and SEO settings. It does not establish compatibility with a particular search plugin, theme, or custom field. [WPML language setup] [WPML language URL options] | Check current compatibility information for your exact search implementation; do not infer it from language or URL setup alone. |
| Polylang | Its setup documentation covers installation, languages, settings, and translation topics, but the reviewed page does not establish search behavior. [Polylang getting started documentation] | Test the chosen search form and content types with your current configuration. |
Compare plugins by the content they can cover, how translations fit your workflow, compatibility with custom or indexed search, language URL options, and the testing and maintenance your site will require. Documentation for language setup alone is not proof that a particular search integration works.
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Set up languages and translate searchable content
Configure the site languages
Follow your selected plugin’s setup flow to set the existing site language and add the languages you plan to support. With WPML, the setup documentation describes choosing the current language and target languages, selecting a URL format, and adding a language switcher. The documented URL choices include language directories, separate domains, or a language parameter. [WPML language setup] [WPML language URL options]
Translate the material search needs to return
TranslatePress describes a visual, front-end translation editor. In its documented search approach, a post is searchable in a target language only when its title and content have translations in that language. Its developer documentation states: “For the search to work on a specific post in a specific language, translation of that post content and title in that same language must exist prior to searching.” [TranslatePress custom search documentation]
Apply that requirement to the content types in your inventory. If visitors search products, pages, or custom post types, verify that the fields users are likely to search are translated and available to the relevant search query.
Use a search form supported by the integration
Standard WordPress search
For a site using standard WordPress search, TranslatePress says its integration filters results to the selected language. Test the search form used by your theme rather than assuming every custom form uses the standard query. [TranslatePress multilingual search guide]
WooCommerce product search
For product-only searches, TranslatePress’s guide points to WooCommerce’s Product Search widget and says its results remain in the selected language. Confirm that the widget is the one your store actually uses and that product translations are available. [TranslatePress multilingual search guide]
Custom queries and indexed search
TranslatePress documents the trp_force_search filter for search conditions outside the main front-end search, and discusses WP_Query and pre_get_posts. It also gives an example of passing translated-language result IDs to a custom product-search integration. Treat such code as a starting point, not a drop-in guarantee: adapt it to the site’s actual search plugin and validate behavior after changes. [TranslatePress custom search documentation]
In TranslatePress’s described translated-search approach, custom fields are not searchable unless their content is included in the_content. The vendor also says index-based search plugins do not work correctly out of the box. If either limitation applies, you will need a deliberate compatibility solution or a search setup whose documented behavior covers those fields or indexes.
Test results in every language
Run representative searches through the forms visitors will use. Test both successful matches and likely edge cases, including content that has not yet been translated.
- Search for a term in the language currently displayed and confirm that matching translated posts or products appear.
- Check that each expected result has a translated title and content in that language.
- Check what happens when a relevant item is untranslated; decide whether that behavior is acceptable for your site.
- If users search custom fields, test terms that exist only in those fields.
- If the site uses an indexed-search plugin, verify its results and language filtering specifically rather than assuming standard search behavior applies.
- Repeat the checks for each language and for each distinct search form or content type in scope.
Configure language URLs separately from on-site search
Language URL structure and search compatibility solve different problems. WPML documents language directories, separate domains, and query parameters, as well as translated slugs and hreflang output for translated pages. These settings help identify language versions for navigation and search engines; they do not establish that an on-site search plugin, theme, custom field, or index is compatible. [WPML language URL options] [WPML language setup]
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