Which languages Marcus supports
Marcus inherits language capability from Anthropic Claude, the underlying AI model. That means coverage for 40+ languages across major writing systems: Latin script (English, French, Spanish, German, Portuguese, Dutch, Swedish, Norwegian, Danish, Finnish, Estonian, Polish, Czech, Romanian, and more), Cyrillic (Russian, Ukrainian, Bulgarian, Serbian), Chinese (simplified and traditional), Japanese, Korean, Arabic, Hebrew, Turkish, Vietnamese, Thai, and others.
If you can type it in a modern browser and Claude supports it, Marcus can generate content in it. This includes both widely-spoken languages and smaller European languages like Icelandic or Latvian.
How to tell Marcus which language to use
Just include the language in your prompt when you describe what you want. You can write this instruction in English or in the target language itself. Examples that work:
- 'Write a homepage for a bakery in Portuguese'
- 'Create an about page auf Deutsch'
- 'Make a services page на русском языке'
- '产品页面用中文'
Marcus interprets the language cue and generates all headings, body text, navigation labels, and UI copy in that language. You don't need to configure a setting or toggle a switch — the prompt is the interface.
Right-to-left languages work automatically
When you request content in Arabic, Hebrew, or other right-to-left languages, Marcus applies RTL layout automatically. Text aligns to the right, navigation order reverses, and the reading flow matches native expectations. You don't write custom CSS or set dir attributes — Marcus handles it as part of the generation.
This matters for usability. A site in Arabic that renders left-to-right looks broken. Marcus prevents that by detecting the script and applying the correct directionality at build time.
Can you mix languages on one site
Yes. Each page request is independent. You can build a site with an English homepage, a German services page, and a French contact page by prompting each one separately. Marcus doesn't enforce site-wide language consistency — you control it per page.
This is useful for businesses operating in multilingual markets or testing content in multiple languages before committing to full localization. Each page stands alone; there's no shared language setting to override.
What to expect from less common languages
Quality tracks Claude's strength in each language. English, Chinese, Spanish, French, and German produce excellent results — natural phrasing, idiomatic expressions, appropriate formality. Smaller languages like Estonian or Finnish work well but may occasionally show minor awkwardness in tone or phrasing that a native editor would smooth out.
Marcus doesn't invent words or produce garbled output, but for low-resource languages you may want a native speaker to review the result before publishing. The structure, layout, and logic remain solid regardless of language; it's the fine-tuning of voice that varies.
What Marcus doesn't do with languages
Marcus generates content in one language at a time per page. It doesn't create automatic translations of existing pages, manage language switchers, or maintain synchronized multilingual versions of the same content. If you need a five-language site, you prompt Marcus five times with the same brief in different languages and publish five separate pages.
Marcus also doesn't detect your language automatically from your IP or browser. You always specify the language explicitly in the prompt. This keeps behavior predictable and avoids wrong-language output from ambiguous instructions.
Practical scenarios for multilingual sites
Typical use cases: a French company wants an English site for international clients, a consultant in Switzerland needs German and Italian versions of their homepage, a developer in Estonia builds a local-language landing page for a SaaS product. In each case, you write the prompt in whichever language is easiest for you and specify the output language.
Marcus's €29/month Builder tier and €290/month Studio tier (covering up to 25 projects) both support all languages equally. There's no upcharge for non-English content. The free tier — 1 project, 5 pages — also works in any language Marcus supports.