How Weglot
technically works

A developer’s look at Weglot’s reverse proxy solution and JavaScript integration.

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Take the time and hassle out of website translation

JavaScript integration

The Weglot JavaScript integration is the fastest and simplest way to set up translations for your website. By just copy-pasting a few lines of JavaScript, you can translate any website in seconds. It’s best used for testing, when you don’t need to be visible on global search engines or when you want to translate private content. The translations are fetched and then inserted into the page by the browser after it has downloaded the page source. This means the translations are not stored in any source code and therefore not detected by search engines.

Weglot technical explanation 1


Website visitor asks for a page on your website.



Your server sends the page back to the website visitor’s browser in the original language, with a script tag calling the Weglot JS library.



The library detects the user language, based on their choice or their locale, gathers all the content, and sends it to the Weglot Translation API.



The Weglot Translation API sends the translations back, and the Weglot JS library swaps the original content for the translations.

Reverse proxy solution

Configure Weglot’s Content Delivery Network for a fully translated website in minutes. Choose between our "subdomain" and "subdirectory" based on how you want the translated pages to appear (e.g. or For subdomain mode, you'll edit your DNS settings to create specific subdomains for each new language and point them to the Weglot servers. For subdirectory (in beta), you'll edit your DNS to point your entire domain to us.

Any request for a translated version of your website will deliver blazing fast results to your customer in their native language. Plus, a layer of cache on top of the Weglot translation API means if the exact same translation request is sent twice, it will remember the answer and send it back to you instantly. Weglot’s reverse proxy solution provides you with a fully SEO-friendly version of your website that’s easily indexed by global search engines.



Website visitor asks for a page of your website in French. The subdomain fr. points to the Weglot reverse proxy server.



The Weglot proxy server asks your website server for the original page.



Your server sends the page back to Weglot in the original language.



Weglot detects all the content and sends it to the Weglot Translation API.



The Weglot Translation API sends the translations back and the Weglot proxy server replaces the original content for the translations in the source code of the page.



The French page is delivered to your website visitor.

Weglot technical explanation 2

Automated features

A website translation solution with zero developer effort

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Read more on our dedicated developer documentation

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Technical FAQ

Weglot proxy server reliability and availability
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The Weglot proxy server is hosted on servers distributed in locations around the world. Your website visitors will have a fast, secure, and seamless experience when it comes to viewing your site in their language as they’ll be closer to the source of data. Weglot has a 99% uptime SLA.
Where does the data get stored?
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Your translations are stored on the Weglot database. The Weglot database is fully backed up daily.
What data do you store?
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Weglot stores all the HTML fragments it translates as well as their translations. It also stores data associated with your project settings, such as glossary rules. You can exclude translations by URL or more finely by CSS selector in order to avoid sending confidential data, such as personally identifiable information (PII), to Weglot.

By default after a project is removed at the termination of the contract, any stored data is removed after 180 days of inactivity – this can be deleted sooner upon request.
Is Weglot GDPR compliant?
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Yes, no user data is stored by Weglot. Our translation database is located in AWS Frankfurt.
What are Weglot’s service hours?
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Weglot’s service is 24/7 with a 99% service level guarantee.
Is it translated via proxy?
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Yes. Weglot reverse proxy servers will automatically retrieve your website pages, detect the original content and swap it for translations.
Does Weglot have an API?
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Yes – You can translate any content by directly calling our API. Read our API documentation for more information.
​​Which DNS entries need to be added?
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It depends on what you want URLs to look like for your users.
If you want to use subdomains and have your Spanish-translated products page available on, you’ll need to create 1 CNAME record per translated language and associated subdomain and point them to
If you want to use subdirectories (currently in beta), and have your translated products page available on, you’ll need to create a single A record for your entire domain pointing to a Weglot IP address you’ll get during onboarding.
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