Slim SEO - WPML Integration
WPML is the go-to solution for efficient, accurate, and hassle-free translation management in WordPress. With over 1 million active users worldwide and more than 15 years of industry expertise, WPML is a trusted market leader in WordPress multilingual solutions.
If you're a Slim SEO user, you'll have a full integration with WPML, that helps you improve your multilingual site's SEO performance.
Translating meta title and description for posts​
Slim SEO allows you to set specific meta title and meta description for posts. Now you can translate these meta tags with WPML easily. Follow these steps:
Assuming that you have a post with manual meta title and description as follows:
On the right sidebar, in the Translation area, click the plus icon (or the settings icon if you already translated it) next to the language to add a new translation for the post. WPML will automatically loads the translation editor screen for you to translate the content like this:
You'll see Slim SEO's meta tags (title and description) available there, so you can translate them for the post.
Translating meta tags settings​
Slim SEO has a settings page, where you can set up the meta tags for post types and taxonomies with dynamic variables:
You can translate these settings with WPML with the help of the String Translation module.
Simply go to WPML → String Translation, and enter slim_seo in the search box to find all settings by Slim SEO. Then in the table list below, you can click the plus icon next to the settings you want to translate:
If you don't see Slim SEO's settings here, that means that the settings is not modified and will use the default value. In this case, you need to modify the default settings value at Slim SEO → Meta Tags. Then go back to this screen and you'll see the settings.
It's not possible to switch the language (from the language switcher in the admin bar) and enter the translations directly on the Slim SEO's settings page. You must translate the settings on the WPML's String Translations page.
Hreflang tag and multilingual sitemap​
Another aspect of multilingual SEO is the hreflang tag. By default, WPML automatically outputs the hreflang in the HTML of the posts on the front end, like this, so Slim SEO has to do nothing:
<link rel="alternate" hreflang="en" href="https://example.com/wordcamp-asia-2025/" />
<link rel="alternate" hreflang="vi" href="https://example.com/vi/wordcamp-asia-2025/" />
<link rel="alternate" hreflang="x-default" href="https://example.com/wordcamp-asia-2025/" />
However, in the XML sitemap for posts, Slim SEO will automatically adds hreflang tags to the sitemap for each post. This is not visible to human, but when you view the source code of the sitemap, you will see it like this:
Both methods (outputting in HTML and in XML sitemap) are the recommended ways to tell Google about translations of your pages.