How should you investigate a decline in indexed pages for one language version of a multilingual site after six months?

After a multilingual standalone website has been operating for about six months, a continued decline in indexed pages for a particular language is usually not because “the search engine suddenly dislikes that market,” but because crawlability, canonicalization, language targeting, or content quality signals have changed. Do not rush to submit links in bulk or make widespread title changes. First, confirm whether the decline is occurring in “valid indexing” or merely in reporting metrics, then investigate whether pages are crawlable, identifiable as independent language versions, and worth retaining.

This issue directly affects organic visibility for the relevant language: product pages, category pages, or article pages that previously generated long-tail traffic may no longer appear in search results. Even newly added content may subsequently continue to be excluded because of similar technical issues. Investigation should be based primarily on data from the search engine console, with pages before and after the decline sampled and verified individually. Do not rely solely on site search commands or estimated figures from third-party tools.

First confirm: Is indexing declining, or has the page count changed?

Open the “Page indexing” report or a similar report for the relevant site property, and compare the trends over the past three months with those before the decline. Focus on whether the number of “indexed” pages has decreased, while also checking whether the reasons for excluded pages have increased significantly in specific categories. Different statuses require different actions:

Also verify the actual number of pages in the website backend. When updating products, adjusting categories, or switching language plugins, some teams may take old pages offline, change URL rules, or change paginated and filtered pages from indexable to non-indexable. In such cases, an “indexing decline” may be normal, but it is still necessary to ensure that important landing pages have not been affected unintentionally.

Start with several declining pages rather than checking the entire site at once

Select 5 to 10 pages that were previously indexed but are now excluded, and use the URL Inspection tool to review each page: the last crawl time, whether crawling was successful, indexability status, the user-declared canonical, and the canonical ultimately selected by the search engine. Then open the page in a browser and confirm that regular visitors receive a 200 status code rather than a redirect, blank content, a soft 404, or a page that requires scripts to load for an extended period.

Pay particular attention to language-switching logic. Some websites automatically redirect visitors based on browser language or location. For example, if a French page redirects directly to the English homepage, crawlers will have difficulty consistently obtaining the French content. Language versions should have fixed, directly accessible URLs. Automatic language recommendations may be retained, but they should not forcibly override the URL requested by users or crawlers.

Language tags and canonical tags are most likely to conflict with each other

Multilingual pages need to clearly tell search engines which URLs are different language versions of the same content and which page is the canonical version of the current URL. A common error is having French, German, and English pages all point their canonical tags to the English page. Technically, this actively declares that non-English versions are duplicate pages, so it is unsurprising if they are later consolidated or removed from the index.

• The canonical for each indexable language page should generally point to its own full URL, rather than directing all pages to the default-language page.
• hreflang should use the correct language or language-region code, with all language versions referencing one another and, where necessary, including a default version.
• URLs in the tags must be accessible, return 200, contain no noindex directive, and must not redirect to another language version.
• The sitemap should list canonical URLs and should not include parameterized pages, old paths, redirect URLs, or deleted pages.

Do not treat hreflang as an indexing switch. It primarily helps search engines match users with appropriate language versions; it cannot fix low-quality content, incorrect canonicals, or crawling issues. After correcting the tags, also check whether the page body, titles, navigation, and structured data genuinely use the target language. Avoid translating only the body text while leaving menus, breadcrumbs, and product attributes largely in another language.

“Translated” content does not mean a language page has independent value

A decline in indexing for a particular language after six months can also occur when pages are initially indexed on a trial basis and then reassessed later. Obvious machine-translation traces, product pages that differ only by model number, and category pages with very little content can all make a language version lack sufficient value to retain. This is especially common with B2B product pages: when different pages use the same images and specification tables and only one or two sentences in the body text are changed, search engines tend to retain only one version.

First check whether the decline is concentrated in product detail pages, tag pages, filtered combination pages, or automatically generated regional pages. For pages that genuinely serve lead-generation purposes, add information that readers in the target market care about, such as application scenarios, specification explanations, delivery scope, inquiry requirements, frequently asked questions, and clear product differentiators. For filtered pages and duplicate tag pages with no independent search demand, there is no need to force indexing; interference can be reduced through canonicalization, noindex directives, or internal-link adjustments.

Check crawl entry points and server responses

If page content is adequate but indexing does not recover for a long time, return to the crawling layer. Review server logs or console crawl statistics to determine whether the relevant language directory has a large number of 5xx errors, 429 responses, timeouts, or loading failures. Multilingual sites often place translation services, image resources, or regional scripts in the page-rendering chain. If one external resource is unstable, crawlers may receive incomplete pages.

Internal links should not rely solely on the language switcher. The target-language homepage, category pages, and related articles should naturally link to key detail pages. If all pages can only be found through the XML sitemap, or if their page depth is too great, their crawl priority will be lower. After publishing new navigation, changing URLs, or migrating a CMS, recheck whether the relevant language directory still receives effective entry points from navigation, breadcrumbs, and related-content modules.

After fixes, proceed according to impact rather than repeatedly submitting all pages

First address errors that cause systematic exclusion, such as sitewide canonicals pointing to the default language, noindex being mistakenly added to templates, language pages being redirected, or robots rules blocking pages by mistake. Then prioritize improving pages with business value that previously received visibility, followed by long-tail pages. After the fixes, update the sitemap and use the inspection tool on representative URLs to request validation or recrawling; frequent bulk submissions cannot replace content and technical fixes.

Afterward, review the exclusion reasons in indexing reports each week, the crawl times of key pages, and changes in search visibility for the target language. If only a small number of low-value pages decline while core categories and product pages remain normal, there is no need to treat “total indexed pages” as the sole objective. What truly requires attention is when important pages are continuously selected as duplicates of other language versions, or when they remain unable to enter the index long after being crawled successfully.