Is the multilingual site opened in a subdirectory or using a separate domain?
Which is better, setting up a multilingual site as a subdirectory or using a separate domain? For most teams, it's better to start with a subdirectory: each language is hung under the same domain under paths like /cn/, /en/, /de/, etc., the domain authority and resolution configuration are concentrated in one place, and switching between multilingual sites on the back end only requires maintaining a set of templates and a set of pseudo-static rules, and the cost of adding a new language is the lowest.The need for an independent domain name is for situations where markets are isolated from each other, require different records and compliance subjects, or the operation teams are completely separate. Below, the differences between the three hosting methods of subdirectory, subdomain, and independent domain name will be explained, and an order that can be followed directly will be given.
Where are the differences between the three carrier methods?
The difference is not in how the page looks, but in who the weight is attributed to, how many configurations need to be changed, and who is affected when things go wrong. Subdirectories share the same domain and naturally inherit the history and trust of the main domain; subdomains (such as en.example.com) are independent entry points in parsing and certificates, have one more layer of management than the main domain, and the attribution of weight also needs to be clarified through in-site links; independent domains (such as example.de) are completely separated from each other, requiring each to accumulate trust individually, do their own parsing and certificate submission, and submit their site maps individually.
| Carrying mode | Weight attribution | Configuration to maintain | The impact of errors | Who is it suitable for |
|---|---|---|---|---|
| Subdirectory | Same domain shared | A set of templates, a set of rewrite rules | The entire site | Many languages but the brand and team are one |
| Subdomain | The same main domain, independent entry | Parsing, certificates are more in each | This subdomain | Layering business such as blogs and malls |
| Independent domain | Accumulate separately | Each domain name has a separate set | Only this market | Market independent, has a local compliant entity |
How to declare language and region
After the structure is determined, the search engine should be informed of the language and region of a web page. The common practice in public information is to add language tags: The Weglot guide updated in September 2026 describes this as 'informing the search engine of the language and region targeted by the page, as well as any alternative versions', the same guide's evaluation of subdirectories is to point out that paths under the same domain name can maintain the authority of a single domain name.'This means in practice: Tags are supplementary explanations, not sources of weight; first choose the structure correctly, make sure each language has an independent accessible address, and then use tags to clarify the relationship between versions, which is more convenient than doing it the other way around.
Maintenance costs and switching risks
The most common pitfall in multilingual sites is not the translation quality, but 'How many times to multiply the change.' When adjusting the structure of the same place, if each language maintains its own template, it needs to be changed three times. If one is missed, it will appear that the link of a certain language points to the wrong directory. The way to manage multiple sites and languages with the same background is to put the variable part into the configuration: when adding a new language, only fill in one site parameter, and the pseudo-static rules, sitemap and push channel follow the settings of the main station, and the anchor text and keyword library also share one, to avoid each language growing its own set of rules.
The risk of switching structure is concentrated in the old address. If initially an independent domain is used and later merged into a subdirectory, or vice versa, the old address needs to be redirected to the new address one by one using 301 redirect, the site map needs to be regenerated and resubmitted, otherwise the inclusion and on-site weight will remain with the old address. It is recommended to place such actions during the off-season, moving only one layer of structure at a time.
Choose structure based on the target market
A executable sequence: first, check if the market is operated by the same team, if so, start with a subdirectory; then, check if there is a local entity and compliance requirements, if there is, give the market a separate domain name, and the rest of the languages still stay on the main domain; finally, look at the business layer, forums, malls and other modules that need independent entries use subdomains, and the main content is still placed in subdirectories. In this way, the three types of needs are met, but the number of domains and templates that need manual maintenance is controlled to the minimum range.
For personal blogs and small and medium-sized enterprise websites, the additional cost of a separate domain name is difficult to offset by the benefits: multi-language site configuration, backup and recovery, and SEO-related push channels all need to be duplicated by the domain name. It is a more stable path to run the content model and translation process under the same domain first, and then split when the business really separates.
Common questions
Will subdirectories drag down English pages with Chinese content?It will not drag down automatically. Each language page is an independent address, and the directories within the same domain rely on internal links to reference each other; as long as all languages are not mixed on the same page, extraction and indexing are processed according to single pages.
Have you already used the subdomain, can you change it to a subdirectory?Yes, but you need to handle it according to the structural migration: After the new address goes online, use 301 redirect to point the subdomain address to the subdirectory address one by one, resubmit the sitemap, and observe the replacement completion before removing the old parsing.
Is an independent domain name necessarily不利于 international SEO?Not necessarily. It has brand and compliance advantages in the local market, but the cost is that each domain needs to accumulate trust independently and configure multiple copies. The basis for judgment is whether the market is truly separated, rather than which method is 'more advanced'.
Should the entire page be translated for multilingual pages?The existing page uses whole-page HTML translation to take over faster than rebuilding the template. The new content is written separately by language for better control. When both paths are taken, it is necessary to ensure that the same article has a stable corresponding address in each language, which is convenient for marking and promotion.