MCP server · Translation

KAERIS i18n MCP server

Translate your app's text files into 46 languages, safely and without breaking placeholders.

Translation For it and development Translation Services

This is a helper that lets your AI translate the text inside your app's language files. It handles the common file types used by apps and websites, and it keeps the little placeholders like {name} or %s intact. It is handy if you are adding new languages to an app and do not want to hand-edit every file.

What is an MCP server? The 30-second version

On its own, your AI can only chat. An MCP server is a small helper program that gives your AI a new skill or a connection to another service. This one connects your AI to KAERIS, a translation service for app text files. Once it is set up, you can just ask your AI to translate a file, and it will do it through this helper.

What this MCP server does

You ask your AI something like "translate my English file into German and Japanese." The AI uses this helper to look at your file and send the text to KAERIS. KAERIS translates each string and checks that placeholders and formatting are still correct. The helper writes the translated files back, and the AI tells you what it did. It can also just look at your project and tell you which languages are missing or broken, without translating anything.

Flow diagram: you ask your AI “Translate my English file into German and Japanese”, the KAERIS i18n MCP server works in steps: reads your text file, then translates each string, then checks and writes files back, and you get back translated files plus a short report.

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What you can do with it

Translate a language file into any of 46 languages
Add a brand new language by translating your whole source file
Only translate the new or changed strings, leaving the rest untouched
Check which keys are missing or broken for a language
List the exact missing keys with their source text
See which languages your project already supports
Get a quality check on translations, like placeholder mismatches

Try asking your AI

“Translate locales/en.json into German, Ukrainian and Japanese.”
“Add French and Spanish translations for these buttons: Save, Cancel, Delete.”
“Only translate the new keys I added to en.json, don't redo the whole file.”
“Check this repo's i18n and tell me what's missing or broken.”

What it gives back to you

You get back the translated text or files, plus a short report. The report can list missing keys, extra keys, placeholder problems, and other quality warnings. If you asked for a status check, you get a summary per language instead of translations. Everything appears right in your chat.

Before you start

What you need

Python installed (for the pip install option)
Or Docker (if you prefer the Docker option)
An MCP client like Claude Desktop, Cursor, or Claude Code
Optional: a KAERIS API key for higher limits (the free tier works without one)

Good to know

Translating files uses the KAERIS service and may cost money on paid tiers, though the free tier works without a key.

Install it with your AI

Add KAERIS i18n MCP server to your AI, no technical skills needed

You don't install anything by hand. You copy one prompt, paste it into an AI that can work on your computer, and it checks, installs and connects the server for you, asking you when it needs something.

Sign in to get the install prompt

Members get a ready-made prompt that lets the Claude desktop app check KAERIS i18n MCP server, install it and connect it for them, step by step. You don't need any technical skills: you copy, paste and answer a few questions. Your connected AI can also find and install any of the 4,066 MCP servers here for you.